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tech:network:cisco:multicast:introduction:introduction

Multicast Introduction

Notes

  • Class D (bits starts with 1110) 224.0.0.0 ~ 239.255.255.255
  • MAC Address: 01-00-5E-XX-XX-XX (0100.5EXX.XXXX)
    • 0x01005E 0000 0001 0000 0000 0101 1110 0
  • Multicast Packet: UDP
  • Scope
    • Link local 224.0.0.0 ~ 224.0.0.255
      • 224.0.0.1 Subnet Multicast Host
      • 224.0.0.2 Subnet Multicast Router
      • 224.0.0.13 All PIM Router
      • 224.0.0.5 All OSPF Router
      • 224.0.0.6 All OSPF DR/BDR Router
      • 224.0.0.9 All RIPv2 Router
      • 224.0.0.10 All EIGRP Router
    • Global scope 224.0.1.0 ~ 238.255.255.255
    • Private scope 239.0.0.0 ~ 239.255.255.255 (deprecated 239.0.0.0/24, 239.128.0.0/24)

224.10.1.1 → 01:00:5E:0A:01:01

224.138.1.1 → 01:00:5E:0A:01:01

Same MAC address 2^5 = 32 exists.

same subnet and same Multicast MAC address needs careful.
but different subnet MAC has no problem.

Sender

Receiver

Switch will flooding multicast traffic.

Router will not forward multicast packet by default as well as broadcast.

Multicast routing must be enabled all routers from sender to receiver.

  • IGMP (Internet Group Management Protocol)
    • IGMPv1
    • IGMPv2
    • IGMPv3
  • IGMP Snooping
  • PIM (Protoco Independent Multicast)
    • PIMv1
    • PIMv2

Distribution Tree

References

tech/network/cisco/multicast/introduction/introduction.txt · Last modified: 2021/05/05 11:30 by wnoguchi