Brocade Communications Systems IPMC5000PEF manual Changing global IP multicast parameters

Show and clear command support

The following new runtime commands have been introduced:

max-mcacheThis command is described in the “Defining the maximum number of PIM cache entries” section.

ip igmp max-group-addressThis command, which is described in the “Defining the maximum number of IGMP group ” section, addresses replaces the system-maxigmp-max-group-addresscommand.

Show and clear command support

The following show and clear commands support Multicast Multi-VRF:

•clear ip igmp [ vrf vrf-name ] cache

•clear ip igmp [ vrf vrf-name ] traffic

•show ip igmp [vrf vrf-name] group [group-address [detail] [tracking]]

•show ip igmp [vrf vrf-name] interface [ve number ethernet port-address tunnel num]

•show ip igmp [vrf vrf-name] settings

•show ip igmp [vrf vrf-name] traffic

Changing global IP multicast parameters

The following sections apply to PIM-DM, PIM-SM, and IGMP.

Concurrent support for multicast routing and snooping

Multicast routing and multicast snooping instances work concurrently on the same device. For example, you can configure PIM routing on certain VEs interfaces and snooping on other VEs or VLANs. The limitation is that either multicast snooping or routing can be enabled on a VE interface or VLAN, but not on both. This is because all of the multicast data and control packets (IGMP, PIM) received on the snooping VLAN are handled by multicast snooping and do not reach the multicast routing component. Similarly, any multicast data or control packets received on a VE interface enabled with PIM routing are handled by the PIM routing component and are not seen by the IGMP or PIM snooping component.

The following considerations apply when configuring concurrent operation of Multicast Routing and Snooping.

1.Either multicast snooping or routing can be enabled on a VE or VLAN but not both.

2.Snooping can be enabled globally by configuring the ip multicast active passive command.

3.The global snooping configuration is inherited by all current VLANs that are not enabled for multicast routing.

4.The global snooping configuration is also inherited by all new VLANs. Enabling multicast routing on a newly created VLAN or VE automatically disables snooping on the VLAN or VE.

5.When a VLAN-level snooping is configured, it is displayed.

72	FastIron Ethernet Switch IP Multicast Configuration Guide
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