I want to understand how multicast egress replication works on catalyst 6500. Say, the ingress module wants to send a mcast packet to six egress modules. The question I have is that - if the Crossbar Switching Fabric is able to replicate the packet itself and the ingress RE queues only one original packet to Crossbar input, or it is a job of the ingress RE to replicated six copies of the packet and queue them to Crossbar?
You can prevent redundant replication of multicast packets across the switch-fabric connection by entering a command that instructs the two replication engines on these modules to forward packets only to local interfaces which are associated with the switch-fabric connection that the replication engine supports.
The requirements are:
Local egress replication is supported with the following software configuration and hardware:
â¢IPv4 egress replication mode
â¢Dual fabric-connection DFC-equipped modules
â¢Layer 3-routed interfaces and subinterfaces that are not part of a port channel
Giuseppe, thank you for the clarification. My question is rather to understand if the ingress RE sends six copies of the packet to each egress slot or it sends only one packet and the Crossbar Arbiter is responsible for activating crossbar cross-points correspondent to the output slots, effectively replicating the multicast packet inside the Crossbar. To rephrase it - Is Crossbar involved in the packet replication?
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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