Considerations for multicast forwarding on PE units

  • The PE unit performs local replication of multi-destination traffic. The PE unit can perform replication within a VLAN, but not across VLANs.
  • In a Campus Fabric domain, the following actions are not supported in a VLAN or VE on which multicast snooping or multicast routing is enabled:
    • Connecting a PIM router to a PE port.
    • Connecting a multicast (IGMP or MLD) querier switch to a PE port.
  • Multi-destination traffic forwarding and replication on PE units is performed using forwarding entries in the Layer 2 table.
  • A lookup is performed using a multicast E-CID in the E-tag header.
  • Forwarding cache entries are set up, updated, or torn down based on the E-channel register Control and Status Protocol (CSP) messages from the CB unit.
Parent topic: Campus Fabric and IP multicast considerations