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Uplink switch, Layer 2 multicast snooping over mct, Igmp/mld snooping – Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide User Manual

Page 179: Igmp/mld snooping behavior on mct cluster devices, Uplink switch layer 2 multicast snooping over mct

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Uplink switch

Uplink switch capability is supported on MCT VLANs. ICLs and CCEPs can be configured as uplink-
switch ports. Both cluster devices should have exactly the same uplink-switch port memberships
configured for the ICL and CCEPs.

Layer 2 multicast snooping over MCT

To support multicast snooping over MCT, the ICL port uses MDUP to synchronize the following
information between the cluster devices:

• MAC-forward entries (mcache entries on MCT VLAN)
• IGMP/MLD Join/Leave (control packets on MCT VLAN)
• PIM-SM/PIM6-SM Join/Prune (control packets on MCT VLAN)
• IGMP/MLD dynamic router ports on MCT VLAN

IGMP/MLD snooping

Snooping can be configured globally or at the VLAN level. Each cluster device in the MCT VLAN can be
configured as active or passive. There is no restriction for cluster devices to run active-active or
passive-passive configurations.

The following commands show configuration commands for the VLAN level (IGMP and MLD), the global
level (IGMP/MLD), and for PIM-SM and PIM6-SM.

VLAN level (IGMP)

device(config)# vlan 100

device(config-vlan-100)# multicast active/passive

VLAN level (MLD)

device(config-vlan-100)# multicast6 active/passive

Global Level (IGMP/MLD)

device(config)# ip multicast active/passive

device(config)# ipv6 multicast active/passive

PIM-SM snooping (configured only on a VLAN and requires IGMP snooping to run in a passive mode):

device(config)# vlan 100

device(config-vlan-100)# multicast passive

device(config-vlan-100)# multicast pimsm-snooping

PIM6-SM snooping (configured only on a VLAN and requires MLD snooping to run in a passive mode):

device(config)# vlan 100

device(config-vlan-100)# multicast6 passive

device(config-vlan-100)# multicast6 pimsm-snooping

IGMP/MLD snooping behavior on MCT cluster devices

• Local information is synchronized to the MCT peer device using CCP. The information includes

Mcache/FDB entry (on arrival of data traffic), joins/leaves, dynamic router ports, and PIM-SM
snooping joins/prunes.

• Native control packets (joins/leaves) that are received are processed by protocol code and are

forwarded if necessary.

Uplink switch

FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide

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