DSW2#sh vlan VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa1/0/1, Fa1/0/2, Fa1/0/3 Fa1/0/4, Fa1/0/5, Fa1/0/6 Fa1/0/7, Fa1/0/8, Fa1/0/9 Fa1/0/10, Fa1/0/11, Fa1/0/12 Fa1/0/13, Fa1/0/14, Fa1/0/15 Fa1/0/16, Fa1/0/17, Fa1/0/18 Fa1/0/19, Fa1/0/20, Fa1/0/21 Fa1/0/22, Fa1/0/23, Fa1/0/24 Gi1/0/1, Gi1/0/2 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 1 enet 100001 1500 - - - - - 0 0 1002 fddi 101002 1500 - - - - - 0 0 1003 tr 101003 1500 - - - - - 0 0 1004 fdnet 101004 1500 - - - ieee - 0 0 VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 1005 trnet 101005 1500 - - - ibm - 0 0 Remote SPAN VLANs ------------------------------------------------------------------------------ Primary Secondary Type Ports ------- --------- ----------------- ------------------------------------------
en conf t vlan 10 name Executive vlan 20,30 vlan 40-45 end
DSW2#conf t Enter configuration commands, one per line. End with CNTL/Z. DSW2(config)#vlan 10 DSW2(config-vlan)#name Executive DSW2(config-vlan)#vlan 20,30 DSW2(config-vlan)#vlan 40-45 DSW2(config-vlan)#end DSW2# *Mar 1 00:05:37.381: %SYS-5-CONFIG_I: Configured from console by console DSW2#sh vlan VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa1/0/1, Fa1/0/2, Fa1/0/3 Fa1/0/4, Fa1/0/5, Fa1/0/6 Fa1/0/7, Fa1/0/8, Fa1/0/9 Fa1/0/10, Fa1/0/11, Fa1/0/12 Fa1/0/13, Fa1/0/14, Fa1/0/15 Fa1/0/16, Fa1/0/17, Fa1/0/18 Fa1/0/19, Fa1/0/20, Fa1/0/21 Fa1/0/22, Fa1/0/23, Fa1/0/24 Gi1/0/1, Gi1/0/2 10 Executive active 20 VLAN0020 active 30 VLAN0030 active 40 VLAN0040 active 41 VLAN0041 active 42 VLAN0042 active 43 VLAN0043 active 44 VLAN0044 active 45 VLAN0045 active 1002 fddi-default act/unsup 1003 token-ring-default act/unsup VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1004 fddinet-default act/unsup 1005 trnet-default act/unsup VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 1 enet 100001 1500 - - - - - 0 0 10 enet 100010 1500 - - - - - 0 0 20 enet 100020 1500 - - - - - 0 0 30 enet 100030 1500 - - - - - 0 0 40 enet 100040 1500 - - - - - 0 0 41 enet 100041 1500 - - - - - 0 0 42 enet 100042 1500 - - - - - 0 0 43 enet 100043 1500 - - - - - 0 0 44 enet 100044 1500 - - - - - 0 0 45 enet 100045 1500 - - - - - 0 0 1002 fddi 101002 1500 - - - - - 0 0 1003 tr 101003 1500 - - - - - 0 0 1004 fdnet 101004 1500 - - - ieee - 0 0 1005 trnet 101005 1500 - - - ibm - 0 0 Remote SPAN VLANs ------------------------------------------------------------------------------ Primary Secondary Type Ports ------- --------- ----------------- ------------------------------------------
delete vlan 10. and names vlan 43 Internetwork Expert.
conf t no vlan 10 vlan 43 name "Internetwork Expert"
DSW2#conf t Enter configuration commands, one per line. End with CNTL/Z. DSW2(config)#no vlan 10 DSW2(config)#vlan 43 DSW2(config-vlan)#name Internetwork Expert ^ % Invalid input detected at '^' marker.
Oops, space included name not permitted. Let's quote space contained name.
DSW2(config-vlan)#name "Internetwork Expert" DSW2(config-vlan)#^Z DSW2# *Mar 1 00:07:54.375: %SYS-5-CONFIG_I: Configured from console by console
passed.
DSW2#sh vlan VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa1/0/1, Fa1/0/2, Fa1/0/3 Fa1/0/4, Fa1/0/5, Fa1/0/6 Fa1/0/7, Fa1/0/8, Fa1/0/9 Fa1/0/10, Fa1/0/11, Fa1/0/12 Fa1/0/13, Fa1/0/14, Fa1/0/15 Fa1/0/16, Fa1/0/17, Fa1/0/18 Fa1/0/19, Fa1/0/20, Fa1/0/21 Fa1/0/22, Fa1/0/23, Fa1/0/24 Gi1/0/1, Gi1/0/2 20 VLAN0020 active 30 VLAN0030 active 40 VLAN0040 active 41 VLAN0041 active 42 VLAN0042 active 43 Internetwork Expert active 44 VLAN0044 active 45 VLAN0045 active 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1005 trnet-default act/unsup VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 1 enet 100001 1500 - - - - - 0 0 20 enet 100020 1500 - - - - - 0 0 30 enet 100030 1500 - - - - - 0 0 40 enet 100040 1500 - - - - - 0 0 41 enet 100041 1500 - - - - - 0 0 42 enet 100042 1500 - - - - - 0 0 43 enet 100043 1500 - - - - - 0 0 44 enet 100044 1500 - - - - - 0 0 45 enet 100045 1500 - - - - - 0 0 1002 fddi 101002 1500 - - - - - 0 0 1003 tr 101003 1500 - - - - - 0 0 1004 fdnet 101004 1500 - - - ieee - 0 0 1005 trnet 101005 1500 - - - ibm - 0 0 Remote SPAN VLANs ------------------------------------------------------------------------------ Primary Secondary Type Ports ------- --------- ----------------- ------------------------------------------
remove default vlans.
conf t no vlan 1 no vlan 1002 no vlan 1003 no vlan 1004 no vlan 1005 no vlan 1002-1005 end
results
DSW2# conf t Enter configuration commands, one per line. End with CNTL/Z. DSW2(config)#no vlan 1 %Default VLAN 1 may not be deleted. DSW2(config)#no vlan 1002 %Default VLAN 1002 may not be deleted. DSW2(config)#no vlan 1003 %Default VLAN 1003 may not be deleted. DSW2(config)#no vlan 1004 %Default VLAN 1004 may not be deleted. DSW2(config)#no vlan 1005 %Default VLAN 1005 may not be deleted. DSW2(config)#no vlan 1002-1005 %Default VLAN 1002 may not be deleted. %Default VLAN 1003 may not be deleted. %Default VLAN 1004 may not be deleted. %Default VLAN 1005 may not be deleted. DSW2(config)#end DSW2# *Mar 1 00:19:25.781: %SYS-5-CONFIG_I: Configured from console by console DSW2#sh vlan VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa1/0/1, Fa1/0/2, Fa1/0/3 Fa1/0/4, Fa1/0/5, Fa1/0/6 Fa1/0/7, Fa1/0/8, Fa1/0/9 Fa1/0/10, Fa1/0/11, Fa1/0/12 Fa1/0/13, Fa1/0/14, Fa1/0/15 Fa1/0/16, Fa1/0/17, Fa1/0/18 Fa1/0/19, Fa1/0/20, Fa1/0/21 Fa1/0/22, Fa1/0/23, Fa1/0/24 Gi1/0/1, Gi1/0/2 20 VLAN0020 active 30 VLAN0030 active 40 VLAN0040 active 41 VLAN0041 active 42 VLAN0042 active 43 Internetwork Expert active 44 VLAN0044 active 45 VLAN0045 active 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1005 trnet-default act/unsup VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 1 enet 100001 1500 - - - - - 0 0 20 enet 100020 1500 - - - - - 0 0 30 enet 100030 1500 - - - - - 0 0 40 enet 100040 1500 - - - - - 0 0 41 enet 100041 1500 - - - - - 0 0 42 enet 100042 1500 - - - - - 0 0 43 enet 100043 1500 - - - - - 0 0 44 enet 100044 1500 - - - - - 0 0 45 enet 100045 1500 - - - - - 0 0 1002 fddi 101002 1500 - - - - - 0 0 1003 tr 101003 1500 - - - - - 0 0 1004 fdnet 101004 1500 - - - ieee - 0 0 1005 trnet 101005 1500 - - - ibm - 0 0 Remote SPAN VLANs ------------------------------------------------------------------------------ Primary Secondary Type Ports ------- --------- ----------------- ------------------------------------------
DSW2#conf t Enter configuration commands, one per line. End with CNTL/Z. DSW2(config)#swi DSW2(config)#int f1/0/23 DSW2(config-if)#switchport mode access DSW2(config-if)#switchport access vlan 43 DSW2(config-if)#^Z DSW2# *Mar 1 05:00:34.600: %SYS-5-CONFIG_I: Configured from console by console DSW2#sh run int f1/0/23 Building configuration... Current configuration : 87 bytes ! interface FastEthernet1/0/23 switchport access vlan 43 switchport mode access end
Remote | |||||
---|---|---|---|---|---|
access | trunk | dynamic desirable | dynamic auto | ||
Local | access | access | N/A | access | access |
trunk | N/A | trunk | trunk | trunk | |
dynamic desirable | access | trunk | trunk | trunk | |
dynamic auto | access | trunk | trunk | access |
Let's see both end of link's configured switch port combination result in.
4 x 4 / 2 = 8 patterns.
Verify in ASW1-2 link f0/4.
pre-configuration.
en conf t vlan 10 name Executive vlan 20 name Engineer vlan 30 name Sales vlan 40 name Corporate end
ASW1#show vlan brief VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4 Fa0/5, Fa0/6, Fa0/7, Fa0/8 Gi0/1 10 Executive active 20 Engineer active 30 Sales active 40 Corporate active 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup
ASW2#show vlan brief VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4 Fa0/5, Fa0/6, Fa0/7, Fa0/8 Gi0/1 10 Executive active 20 Engineer active 30 Sales active 40 Corporate active 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup
conf t int f0/4 switchport mode access switchport access vlan 20 end
sh run int f0/4 sh int f0/4 switchport
ASW1#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW1(config)#int f0/4 ASW1(config-if)#switchport mode access ASW1(config-if)#switchport access vlan 20 ASW1(config-if)#end ASW1# *Mar 1 22:21:15.588: %SYS-5-CONFIG_I: Configured from console by console ASW1#sh run int f0/4 Building configuration... Current configuration : 84 bytes ! interface FastEthernet0/4 switchport access vlan 20 switchport mode access end ASW1#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: static access Operational Mode: static access Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: native Negotiation of Trunking: Off Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
ASW2#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW2(config)#int f0/4 ASW2(config-if)#switchport mode access ASW2(config-if)#switchport access vlan 20 ASW2(config-if)#end ASW2# *Mar 1 22:20:54.549: %SYS-5-CONFIG_I: Configured from console by console ASW2#sh run int f0/4 Building configuration... Current configuration : 84 bytes ! interface FastEthernet0/4 switchport access vlan 20 switchport mode access end ASW2#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: static access Operational Mode: static access Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: native Negotiation of Trunking: Off Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
conf t int f0/4 no switchport mode access no switchport access vlan 20 end
conf t int f0/4 switchport mode trunk end
sh run int f0/4 sh int f0/4 switchport
ASW1#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW1(config)#int f0/4 ASW1(config-if)#switchport mode trunk ASW1(config-if)#end ASW1# *Mar 1 22:35:14.071: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 22:35:15.070: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW1# *Mar 1 22:35:18.098: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up ASW1#sh run int f0/4 Building configuration... Current configuration : 56 bytes ! interface FastEthernet0/4 switchport mode trunk end ASW1#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
ASW2#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW2(config)#int f0/4 ASW2(config-if)#switchport mode trunk ASW2(config-if)#end ASW2# *Mar 1 22:34:53.024: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 22:34:54.022: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW2# *Mar 1 22:34:57.042: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up ASW2#sh run int f0/4 Building configuration... Current configuration : 56 bytes ! interface FastEthernet0/4 switchport mode trunk end ASW2#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
stop DTP(Dynamic Trunking Protocol).
conf t int f0/4 switchport nonegotiate end
sh run int f0/4 sh int f0/4 switchport
ASW1#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW1(config)#int f0/4 ASW1(config-if)#switchport nonegotiate ASW1(config-if)#end ASW1# *Mar 1 22:40:04.980: %SYS-5-CONFIG_I: Configured from console by console ASW1#sh run int f0/4 Building configuration... Current configuration : 80 bytes ! interface FastEthernet0/4 switchport mode trunk switchport nonegotiate end ASW1#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: Off Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
ASW2#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW2(config)#int f0/4 ASW2(config-if)#switchport nonegotiate ASW2(config-if)#end ASW2# *Mar 1 22:39:43.924: %SYS-5-CONFIG_I: Configured from console by console ASW2#sh run int f0/4 Building configuration... Current configuration : 80 bytes ! interface FastEthernet0/4 switchport mode trunk switchport nonegotiate end ASW2#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: Off Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
conf t int f0/4 no switchport mode trunk no switchport nonegotiate end
ASW1#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW1(config)#int f0/4 ASW1(config-if)#no switchport mode trunk Command rejected: An interface must be configured to the "Access" or "Trunk" modes to be configured to "NoNegotiate." ASW1(config-if)#no switchport nonegotiate ASW1(config-if)#end ASW1# *Mar 1 22:41:03.490: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 22:41:04.463: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW1# *Mar 1 22:41:07.500: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up
ASW2#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW2(config)#int f0/4 ASW2(config-if)#no switchport mode trunk Command rejected: An interface must be configured to the "Access" or "Trunk" modes to be configured to "NoNegotiate." ASW2(config-if)#no switchport nonegotiate ASW2(config-if)#end ASW2# *Mar 1 22:40:42.435: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 22:40:43.416: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW2# *Mar 1 22:40:46.453: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up
no switchport mode trunk
before no switchport nonegotiate
command rejected.
says switchport nonegotiate
must be configured explicitly access or trunk.
correct remove configuration list are:
conf t int f0/4 no switchport nonegotiate no switchport mode trunk end
then
ASW1#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW1(config)#int f0/4 ASW1(config-if)#no switchport mode trunk ASW1(config-if)#end ASW1# *Mar 1 22:46:16.587: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 22:46:17.560: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW1# *Mar 1 22:46:20.580: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up
ASW2#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW2(config)#int f0/4 ASW2(config-if)#no switchport mode trunk ASW2(config-if)#end ASW2# *Mar 1 22:45:55.531: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 22:45:56.504: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW2# *Mar 1 22:45:59.533: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up
Let's configure malformed combination.
conf t int f0/4 switchport mode access switchport access vlan 20 end
conf t int f0/4 switchport mode trunk end
sh run int f0/4 sh int f0/4 switchport
CDP Discover Native VLAN Mismatch.
ASW1#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW1(config)#int f0/4 ASW1(config-if)#switchport mode access ASW1(config-if)#switchport access vlan 20 ASW1(config-if)#end ASW1# *Mar 1 22:52:57.386: %SYS-5-CONFIG_I: Configured from console by console ASW1# *Mar 1 22:53:06.865: %SPANTREE-7-RECV_1Q_NON_TRUNK: Received 802.1Q BPDU on non trunk FastEthernet0/4 VLAN20. *Mar 1 22:53:06.865: %SPANTREE-7-BLOCK_PORT_TYPE: Blocking FastEthernet0/4 on VLAN0020. Inconsistent port type. ASW1# *Mar 1 22:53:06.882: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (20), with ASW2 FastEthernet0/4 (1). ASW1# *Mar 1 22:53:08.685: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (20), with ASW2 FastEthernet0/4 (1). ASW1# *Mar 1 22:53:09.692: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (20), with ASW2 FastEthernet0/4 (1). ASW1# *Mar 1 22:53:10.699: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (20), with ASW2 FastEthernet0/4 (1). ASW1# *Mar 1 22:53:11.705: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (20), with ASW2 FastEthernet0/4 (1). ASW1# *Mar 1 22:53:12.712: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (20) , with ASW2 FastEthernet0/4 (1). ASW1# *Mar 1 22:53:13.719: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (20), with ASW2 FastEthernet0/4 (1). ASW1# *Mar 1 22:53:14.725: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (20), with ASW2 FastEthernet0/4 (1). ASW1# *Mar 1 22:53:15.732: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (20), with ASW2 FastEthernet0/4 (1). ASW1#sh run int f0/4 Building configuration... Current configuration : 84 bytes ! interface FastEthernet0/4 switchport access vlan 20 switchport mode access end ASW1#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: static access Operational Mode: static access Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: native Negotiation of Trunking: Off Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none ASW1# *Mar 1 22:54:15.736: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (20), with ASW2 FastEthernet0/4 (1).
ASW2#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW2(config)#int f0/4 ASW2(config-if)#switchport mode trunk ASW2(config-if)#end ASW2# *Mar 1 22:52:41.808: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 22:52:42.807: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW2# *Mar 1 22:52:45.827: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up ASW2# *Mar 1 22:53:07.603: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (1), with ASW1 FastEthernet0/4 (20). ASW2#sh run int f0/4 Building configuration... Current configuration : 56 bytes ! interface FastEthernet0/4 switchport mode trunk end ASW2#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none ASW2# *Mar 1 22:54:07.607: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (1), with ASW1 FastEthernet0/4 (20).
conf t int f0/4 no switchport mode access no switchport access vlan 20 end
conf t int f0/4 no switchport mode trunk end
conf t int f0/4 switchport mode dynamic desirable switchport access vlan 20 end
sh run int f0/4 sh int f0/4 switchport
Administrative Mode: dynamic desirable, result in Operational Mode: trunk.
ASW1#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW1(config)#int f0/4 ASW1(config-if)#switchport mode dynamic desirable ASW1(config-if)#switchport access vlan 20 ASW1(config-if)#end ASW1# *Mar 1 22:57:00.177: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 22:57:01.159: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW1# *Mar 1 22:57:04.204: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up ASW1#sh run int f0/4 Building configuration... Current configuration : 95 bytes ! interface FastEthernet0/4 switchport access vlan 20 switchport mode dynamic desirable end ASW1#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: dynamic desirable Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
ASW2#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW2(config)#int f0/4 ASW2(config-if)#switchport mode dynamic desirable ASW2(config-if)#switchport access vlan 20 ASW2(config-if)#end ASW2# *Mar 1 22:56:39.122: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 22:56:40.104: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW2# *Mar 1 22:56:43.149: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up ASW2#sh run int f0/4 Building configuration... Current configuration : 95 bytes ! interface FastEthernet0/4 switchport access vlan 20 switchport mode dynamic desirable end ASW2#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: dynamic desirable Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
conf t int f0/4 no switchport mode dynamic desirable no switchport access vlan 20 end
conf t int f0/4 switchport mode dynamic auto switchport access vlan 20 end
sh run int f0/4 sh int f0/4 switchport
Administrative Mode: dynamic auto, result in Operational Mode: static access.
ASW1#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW1(config)#int f0/4 ASW1(config-if)#switchport mode dynamic auto ASW1(config-if)#switchport access vlan 20 ASW1(config-if)#end ASW1# *Mar 1 22:58:43.852: %SYS-5-CONFIG_I: Configured from console by console ASW1#sh run int f0/4 Building configuration... Current configuration : 60 bytes ! interface FastEthernet0/4 switchport access vlan 20 end ASW1#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: dynamic auto Operational Mode: static access Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: native Negotiation of Trunking: On Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
ASW2#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW2(config)#int f0/4 ASW2(config-if)#switchport mode dynamic auto ASW2(config-if)#switchport access vlan 20 ASW2(config-if)#end ASW2# *Mar 1 22:58:22.797: %SYS-5-CONFIG_I: Configured from console by console ASW2#sh run int f0/4 Building configuration... Current configuration : 60 bytes ! interface FastEthernet0/4 switchport access vlan 20 end ASW2#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: dynamic auto Operational Mode: static access Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: native Negotiation of Trunking: On Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
conf t int f0/4 no switchport mode dynamic auto no switchport access vlan 20 end
conf t int f0/4 switchport mode dynamic desirable switchport access vlan 20 end
conf t int f0/4 switchport mode dynamic auto switchport access vlan 20 end
sh run int f0/4 sh int f0/4 switchport
Result in Operational Mode: trunk.
ASW1#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW1(config)#int f0/4 ASW1(config-if)#switchport mode dynamic desirable ASW1(config-if)#switchport access vlan 20 ASW1(config-if)#end ASW1# *Mar 1 23:00:58.129: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 23:00:59.110: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW1# *Mar 1 23:01:02.155: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up ASW1#sh run int f0/4 Building configuration... Current configuration : 95 bytes ! interface FastEthernet0/4 switchport access vlan 20 switchport mode dynamic desirable end ASW1#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: dynamic desirable Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
ASW2#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW2(config)#int f0/4 ASW2(config-if)#switchport mode dynamic auto ASW2(config-if)#switchport access vlan 20 ASW2(config-if)#end ASW2# *Mar 1 23:00:47.895: %SYS-5-CONFIG_I: Configured from console by console ASW2#sh run int f0/4 Building configuration... Current configuration : 60 bytes ! interface FastEthernet0/4 switchport access vlan 20 end ASW2#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: dynamic auto Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
conf t int f0/4 no switchport mode dynamic desirable no switchport access vlan 20 end
conf t int f0/4 no switchport mode dynamic auto no switchport access vlan 20 end
conf t int f0/4 switchport mode dynamic desirable switchport access vlan 20 end
conf t int f0/4 switchport mode access switchport access vlan 20 end
sh run int f0/4 sh int f0/4 switchport
Result in Operational Mode: static access.
ASW1#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW1(config)#int f0/4 ASW1(config-if)#switchport mode dynamic desirable ASW1(config-if)#switchport access vlan 20 ASW1(config-if)#end ASW1# *Mar 1 23:04:04.389: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 23:04:05.362: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW1#| *Mar 1 23:04:08.408: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up ASW1# *Mar 1 23:04:17.350: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW1# *Mar 1 23:04:20.370: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up ASW1#sh run int f0/4 Building configuration... Current configuration : 95 bytes ! interface FastEthernet0/4 switchport access vlan 20 switchport mode dynamic desirable end ASW1#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: dynamic desirable Operational Mode: static access Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: native Negotiation of Trunking: On Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
ASW2#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW2(config)#int f0/4 ASW2(config-if)#switchport mode access ASW2(config-if)#switchport access vlan 20 ASW2(config-if)#end ASW2# *Mar 1 23:03:55.338: %SYS-5-CONFIG_I: Configured from console by console ASW2#sh run int f0/4 Building configuration... Current configuration : 84 bytes ! interface FastEthernet0/4 switchport access vlan 20 switchport mode access end ASW2#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: static access Operational Mode: static access Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: native Negotiation of Trunking: Off Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
conf t int f0/4 no switchport mode dynamic desirable no switchport access vlan 20 end
conf t int f0/4 no switchport mode access no switchport access vlan 20 end
conf t int f0/4 switchport mode dynamic auto switchport access vlan 20 end
conf t int f0/4 switchport mode trunk end
sh run int f0/4 sh int f0/4 switchport
Result in Operational Mode: trunk.
ASW1#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW1(config)#int f0/4 ASW1(config-if)#switchport mode dynamic auto ASW1(config-if)#switchport access vlan 20 ASW1(config-if)#end ASW1# *Mar 1 23:28:52.713: %SYS-5-CONFIG_I: Configured from console by console ASW1# *Mar 1 23:29:02.888: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW1# *Mar 1 23:29:05.908: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up ASW1#sh run int f0/4 Building configuration... Current configuration : 60 bytes ! interface FastEthernet0/4 switchport access vlan 20 end ASW1#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: dynamic auto Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 20 (Engineer) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
ASW2#conf t Enter configuration commands, one per line. End with CNTL/Z. ASW2(config)#int f0/4 ASW2(config-if)#switchport mode trunk ASW2(config-if)#end ASW2# *Mar 1 23:28:40.826: %SYS-5-CONFIG_I: Configured from console by console *Mar 1 23:28:41.816: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down ASW2# *Mar 1 23:28:44.844: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up ASW2#sh run int f0/4 Building configuration... Current configuration : 56 bytes ! interface FastEthernet0/4 switchport mode trunk end ASW2#sh int f0/4 switchport Name: Fa0/4 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk associations: none Administrative private-vlan trunk mappings: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
conf t int f0/4 no switchport mode dynamic auto no switchport access vlan 20 end
conf t int f0/4 no switchport mode trunk end
Configuration and Verification that's all.