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Juniper Networks/Cisco Systems Switch Interoperability Cookbook

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Background!

Ethernet switches use Internet group management protocol (IGMP) snooping to

determine where a switch should forward multicast traffic. With IGMP snooping enabled,

a switch listens for IGMP reports from attached devices that wish to receive multicast

traffic. The switch then maps subscribed multicast group address(es) to the interface on

which the subscriber is attached. When the switch receives traffic destined for an IP

multicast group address, it will forward it only to those interfaces from which it has heard

membership reports.

Topology!

In this example, both Juniper and Cisco switches operate purely in Layer-2 mode, with no

multicast or unicast routing protocols configured. This test case assumes routing is

handled elsewhere in the network.

A video server generates multicast traffic that is routed across a network and reaches the

two switches described here. The switches, in turn, use their IGMP snooping tables to

determine which ports should and should not receive multicast traffic.

The streaming video server sends traffic to 10 multicast group addresses in the range of

225.0.1.0 through 225.0.1.9. Subscribers attached to the Juniper and Cisco switches join

all 10 multicast groups.

Figure 10 illustrates the topology used to validate IP multicast switching functionality.

Both the Juniper and Cisco switches use IGMP snooping.

!"#$%&'(P)'L$30"C./0'/B"0C1";#'9.3":.0"2;'02-232#4'

Juniper!commands!

In this example, IGMP snooping is enabled on a per-VLAN basis. For example, these

commands create a VLAN called “v2001” and then enable IGMP snooping on that

VLAN:

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Cisco Ex SERIES Manual do Utilizador Página 45