ipv6 unicast-routing ! int f0/0 ipv6 enable ipv6 address fe80::1 link-local ipv6 address 2001:1:1:10::1/64 no shut exit ! end
ipv6 unicast-routing ! int f0/0 ipv6 enable ipv6 address fe80::2 link-local ipv6 address 2001:1:1:10::2/64 no shut exit ! end
R1#conf t Enter configuration commands, one per line. End with CNTL/Z. R1(config)#int f0/0 R1(config-if)#ipv R1(config-if)#ipv6 add R1(config-if)#ipv6 address fe80::1 link R1(config-if)#ipv6 address fe80::1 link-local R1(config-if)#ipv6 addd R1(config-if)#ipv6 addre R1(config-if)#ipv6 address 2001:1:1:10::1 % Incomplete command. R1(config-if)#ipv6 address 2001:1:1:10::1 li R1(config-if)#ipv6 address 2001:1:1:10::1 ? link-local Use link-local address R1(config-if)#ipv6 address 2001:1:1:10::1/64 ? anycast Configure as an anycast cga Use CGA interface identifier eui-64 Use eui-64 interface identifier <cr> R1(config-if)#ipv6 address 2001:1:1:10::1/64
R2#sh run | i ipv6 no ipv6 cef ipv6 address FE80::2 link-local ipv6 address 2001:1:1:10::2/64
R1#sh ipv6 int f0/0 FastEthernet0/0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::1 No Virtual link-local address(es): Global unicast address(es): 2001:1:1:10::1, subnet is 2001:1:1:10::/64 Joined group address(es): FF02::1 FF02::1:FF00:1 MTU is 1500 bytes ICMP error messages limited to one every 100 milliseconds ICMP redirects are enabled ICMP unreachables are sent ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds (using 30000)
R2#sh run | i ipv6 no ipv6 cef ipv6 address FE80::2 link-local ipv6 address 2001:1:1:10::2/64 R2#sh ipv6 int f0/0 FastEthernet0/0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::2 No Virtual link-local address(es): Global unicast address(es): 2001:1:1:10::2, subnet is 2001:1:1:10::/64 Joined group address(es): FF02::1 FF02::1:FF00:2 MTU is 1500 bytes ICMP error messages limited to one every 100 milliseconds ICMP redirects are enabled ICMP unreachables are sent ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds (using 30000)
R1#ping ipv6 fe80::1 Output Interface: FastEthernet0/0 % IPv6 isn't enabled on this interface Output Interface: % Interface required
oh… I forgot no shut
.
R1#ping ipv6 fe80::1 Output Interface: FastEthernet0/0 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to FE80::1, timeout is 2 seconds: Packet sent with a source address of FE80::1%FastEthernet0/0 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/4 ms R1#ping ipv6 2001:1:1:10::1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:1:1:10::1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/4 ms
R2#ping ipv6 fe80::2 Output Interface: FastEthernet0/0 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to FE80::2, timeout is 2 seconds: Packet sent with a source address of FE80::2%FastEthernet0/0 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/0 ms R2#ping ipv6 2001:1:1:10::2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:1:1:10::2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/4 ms
R1#sh cdp neighbors detail ------------------------- Device ID: R2 Entry address(es): IPv6 address: 2001:1:1:10::2 (global unicast) IPv6 address: FE80::2 (link-local) Platform: Cisco 1841, Capabilities: Router Switch IGMP Interface: FastEthernet0/0, Port ID (outgoing port): FastEthernet0/0 Holdtime : 148 sec Version : Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 15.1(4)M10, RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2015 by Cisco Systems, Inc. Compiled Tue 24-Mar-15 08:30 by prod_rel_team advertisement version: 2 VTP Management Domain: '' Duplex: full
R2#sh cdp neighbors detail ------------------------- Device ID: R1 Entry address(es): IPv6 address: 2001:1:1:10::1 (global unicast) IPv6 address: FE80::1 (link-local) Platform: Cisco 1841, Capabilities: Router Switch IGMP Interface: FastEthernet0/0, Port ID (outgoing port): FastEthernet0/0 Holdtime : 162 sec Version : Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 15.1(4)M10, RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2015 by Cisco Systems, Inc. Compiled Tue 24-Mar-15 08:30 by prod_rel_team advertisement version: 2 VTP Management Domain: '' Duplex: full
R1#sh ipv6 neighbors
R2#sh ipv6 neighbors
Empty…
Let' enable ipv6 unicast-routing
, and ipv6 enable
.
no change…
shut
, no shut
R1#conf t Enter configuration commands, one per line. End with CNTL/Z. R1(config)#int f0/0 R1(config-if)#shut R1(config-if)#no shut *Jul 4 23:37:50.367: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state to administratively down *Jul 4 23:37:51.367: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down R1(config-if)#no shut R1(config-if)#^Z R1# *Jul 4 23:37:53.843: %SYS-5-CONFIG_I: Configured from console by console R1# *Jul 4 23:37:54.755: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up *Jul 4 23:37:55.755: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
Insert Switch
no change
R1#sh run | i ipv6 ipv6 unicast-routing ipv6 cef ipv6 address FE80::1 link-local ipv6 address 2001:1:1:10::1/64 ipv6 enable R1#sh run int f0/0 Building configuration... Current configuration : 151 bytes ! interface FastEthernet0/0 no ip address duplex auto speed auto ipv6 address FE80::1 link-local ipv6 address 2001:1:1:10::1/64 ipv6 enable end
R2#sh run | i ipv6 ipv6 unicast-routing ipv6 cef ipv6 address FE80::2 link-local ipv6 address 2001:1:1:10::2/64 ipv6 enable R2#sh run int f0/0 Building configuration... Current configuration : 151 bytes ! interface FastEthernet0/0 no ip address duplex auto speed auto ipv6 address FE80::2 link-local ipv6 address 2001:1:1:10::2/64 ipv6 enable end
I can't understand anymore why show ipv6 neighbors
shows no result.
R1#sh ipv6 neighbors R1#
R2#sh ipv6 neighbors R2#
R1#debug ipv6 packet IPv6 unicast packet debugging is on R1#sh ipv6 neighbors R1#ping ipv6 fe80::1 Output Interface: FastEthernet0/0 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to FE80::1, timeout is 2 seconds: Packet sent with a source address of FE80::1%FastEthernet0/0 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 0/2/4 ms R1# *Jul 5 00:23:22.819: IPv6-Sas: SAS on intf FastEthernet0/0 picked source FE80::1 for FE80::1 *Jul 5 00:23:22.819: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.819: IPV6: source FE80::1 (local) *Jul 5 00:23:22.819: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.823: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, originating *Jul 5 00:23:22.823: IPv6-Fwd: Created tmp mtu cache entry for FE80::1 FE80::1 12000002 *Jul 5 00:23:22.823: IPv6-Fwd: Sending via loopback *Jul 5 00:23:22.823: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.823: IPV6: source FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.823: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.823: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, forward to ulp *Jul 5 00:23:22.823: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.823: IPV6: source FE80::1 (local) *Jul 5 00:23:22.823: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.823: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, originating *Jul 5 00:23:22.823: IPv6-Fwd: Sending via loopback *Jul 5 00:23:22.823: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.823: IPV6: source FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.823: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.823: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, forward to ulp *Jul 5 00:23:22.827: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.827: IPV6: source FE80::1 (local) *Jul 5 00:23:22.827: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.827: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, originating *Jul 5 00:23:22.827: IPv6-Fwd: Sending via loopback *Jul 5 00:23:22.827: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.827: IPV6: source FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.827: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.827: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, forward to ulp *Jul 5 00:23:22.827: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.827: IPV6: source FE80::1 (local) *Jul 5 00:23:22.827: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.827: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, originating *Jul 5 00:23:22.827: IPv6-Fwd: Sending via loopback *Jul 5 00:23:22.827: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.827: IPV6: source FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.827: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.827: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, forward to ulp *Jul 5 00:23:22.831: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.831: IPV6: source FE80::1 (local) *Jul 5 00:23:22.831: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.831: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, originating *Jul 5 00:23:22.831: IPv6-Fwd: Sending via loopback *Jul 5 00:23:22.831: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.831: IPV6: source FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.831: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.831: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, forward to ulp *Jul 5 00:23:22.831: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.831: IPV6: source FE80::1 (local) *Jul 5 00:23:22.831: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.831: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, originating *Jul 5 00:23:22.831: IPv6-Fwd: Sending via loopback *Jul 5 00:23:22.831: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.831: IPV6: source FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.835: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.835: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, forward to ulp *Jul 5 00:23:22.835: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.835: IPV6: source FE80::1 (local) *Jul 5 00:23:22.835: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.835: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, originating *Jul 5 00:23:22.835: IPv6-Fwd: Sending via loopback *Jul 5 00:23:22.835: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.835: IPV6: source FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.835: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.835: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, forward to ulp *Jul 5 00:23:22.835: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.835: IPV6: source FE80::1 (local) *Jul 5 00:23:22.835: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.835: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, originating *Jul 5 00:23:22.835: IPv6-Fwd: Sending via loopback *Jul 5 00:23:22.839: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.839: IPV6: source FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.839: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.839: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, forward to ulp *Jul 5 00:23:22.839: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.839: IPV6: source FE80::1 (local) *Jul 5 00:23:22.839: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.839: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, originating *Jul 5 00:23:22.839: IPv6-Fwd: Sending via loopback *Jul 5 00:23:22.839: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.839: IPV6: source FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.839: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.839: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, forward to ulp *Jul 5 00:23:22.839: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.839: IPV6: source FE80::1 (local) *Jul 5 00:23:22.839: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.843: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, originating *Jul 5 00:23:22.843: IPv6-Fwd: Sending via loopback *Jul 5 00:23:22.843: IPv6-Fwd: Destination lookup for FE80::1 : Local, i/f=FastEthernet0/0, nexthop=FE80::1 *Jul 5 00:23:22.843: IPV6: source FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.843: dest FE80::1 (FastEthernet0/0) *Jul 5 00:23:22.843: traffic class 0, flow 0x0, len 100+0, prot 58, hops 64, forward to ulp R1# R1# *Jul 5 00:23:34.151: IPV6: source FE80::2 (FastEthernet0/0) *Jul 5 00:23:34.151: dest FF02::1 *Jul 5 00:23:34.151: traffic class 224, flow 0x0, len 104+14, prot 58, hops 255, forward to ulp R1#u all All possible debugging has been turned off
R1#sh ipv6 int f0/0 FastEthernet0/0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::1 No Virtual link-local address(es): Global unicast address(es): 2001:1:1:10::1, subnet is 2001:1:1:10::/64 Joined group address(es): FF02::1 FF02::2 FF02::1:FF00:1 MTU is 1500 bytes ICMP error messages limited to one every 100 milliseconds ICMP redirects are enabled ICMP unreachables are sent ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds (using 30000) ND advertised reachable time is 0 (unspecified) ND advertised retransmit interval is 0 (unspecified) ND router advertisements are sent every 200 seconds ND router advertisements live for 1800 seconds ND advertised default router preference is Medium Hosts use stateless autoconfig for addresses. R1#show ipv6 cef ::/0 no route ::/127 discard 2001:1:1:10::/64 attached to FastEthernet0/0 2001:1:1:10::1/128 receive for FastEthernet0/0 FE80::/10 receive for Null0 FF00::/8 multicast R1#show ipv6 neigh R1#show ipv6 neighbors
Same topology of GNS3 virtual lab IOSv 15.5(3)M-1 displays show ipv6 neighbors result
. Why?
conf t ! hostname R1 ! ipv6 unicast-routing ! int gig0/0 ipv6 enable ipv6 address fe80::1 link-local ipv6 address 2001:1:1:10::1/64 no shut exit ! end
conf t ! hostname R2 ! ipv6 unicast-routing ! int gig0/1 ipv6 enable ipv6 address fe80::2 link-local ipv6 address 2001:1:1:10::2/64 no shut exit ! end
Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#! Router(config)#hostname R1 R1(config)#! R1(config)#ipv6 unicast-routing R1(config)#! R1(config)#int gig0/0 R1(config-if)#ipv6 enable R1(config-if)#ipv6 address fe80::1 link-local R1(config-if)#ipv6 address 2001:1:1:10::1/64 R1(config-if)#no shut R1(config-if)#exit R1(config)#! R1(config)#end R1# *Jul 5 23:34:00.375: %SYS-5-CONFIG_I: Configured from console by console R1# *Jul 5 23:34:02.172: %LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up R1# *Jul 5 23:34:03.173: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up R1#ping ipv6 fe80::1%GigabitEthernet0/0 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to FE80::1, timeout is 2 seconds: Packet sent with a source address of FE80::1%GigabitEthernet0/0 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/3 ms R1#ping ipv6 2001:1:1:10::2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:1:1:10::2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/20 ms R1#sh ipv6 nei R1#sh ipv6 neighbors IPv6 Address Age Link-layer Addr State Interface 2001:1:1:10::2 0 0c7d.4966.5b01 REACH Gi0/0 FE80::2 0 0c7d.4966.5b01 DELAY Gi0/0 R1#sh ipv6 neighbors IPv6 Address Age Link-layer Addr State Interface 2001:1:1:10::2 0 0c7d.4966.5b01 REACH Gi0/0 FE80::2 0 0c7d.4966.5b01 DELAY Gi0/0 R1#sh ipv6 neighbors IPv6 Address Age Link-layer Addr State Interface 2001:1:1:10::2 0 0c7d.4966.5b01 REACH Gi0/0 FE80::2 0 0c7d.4966.5b01 REACH Gi0/0 R1#sh ipv6 neighbors IPv6 Address Age Link-layer Addr State Interface 2001:1:1:10::2 0 0c7d.4966.5b01 STALE Gi0/0 FE80::2 0 0c7d.4966.5b01 REACH Gi0/0
Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#! Router(config)#hostname R2 R2(config)#! R2(config)#ipv6 unicast-routing R2(config)#! R2(config)#int gig0/1 R2(config-if)#ipv6 enable R2(config-if)#ipv6 address fe80::2 link-local R2(config-if)#ipv6 address 2001:1:1:10::2/64 R2(config-if)#no shut R2(config-if)#exit R2(config)#! R2(config)#end R2# *Jul 5 23:34:05.338: %SYS-5-CONFIG_I: Configured from console by console R2# *Jul 5 23:34:07.136: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up R2# *Jul 5 23:34:08.137: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up
OK, I search Cisco IOS 15.1(4)M10 IPv6 Neighbor Discovery Cache Documentation.
Finally, I configured globally for all interfaces following command.
ipv6 nd cache interface-limit 4
R1#conf t Enter configuration commands, one per line. End with CNTL/Z. R1(config)#ipv R1(config)#ipv6 nd R1(config)#ipv6 nd ca R1(config)#ipv6 nd cache inter R1(config)#ipv6 nd cache interface-limit 4 R1(config)#^Z R1# *Jul 5 13:16:28.552: %SYS-5-CONFIG_I: Configured from console by console R1#sh ipv R1#sh ipv6 nei R1#sh ipv6 neighbors R1#ping ipv6 fe80::2%FastEthernet0/0 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to FE80::2, timeout is 2 seconds: Packet sent with a source address of FE80::1%FastEthernet0/0 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 0/1/8 ms R1#sh ipv6 neighbors IPv6 Address Age Link-layer Addr State Interface FE80::2 0 0024.c431.126e REACH Fa0/0 R1#ping ipv6 2001:1:1:10::2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:1:1:10::2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 0/2/8 ms R1#sh ipv6 neighbors IPv6 Address Age Link-layer Addr State Interface 2001:1:1:10::2 0 0024.c431.126e REACH Fa0/0 FE80::2 1 0024.c431.126e STALE Fa0/0 R1#ping ipv6 fe80::2%FastEthernet0/0 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to FE80::2, timeout is 2 seconds: Packet sent with a source address of FE80::1%FastEthernet0/0 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/4 ms R1#sh ipv6 neighbors IPv6 Address Age Link-layer Addr State Interface 2001:1:1:10::2 0 0024.c431.126e REACH Fa0/0 FE80::2 0 0024.c431.126e REACH Fa0/0 R1#sh ipv6 neighbors IPv6 Address Age Link-layer Addr State Interface 2001:1:1:10::2 0 0024.c431.126e REACH Fa0/0 FE80::2 0 0024.c431.126e REACH Fa0/0 R1#sh run | i nc cache R1#sh run | i nd cache ipv6 nd cache interface-limit 4
done.