Brocade Multi-Service IronWare Multicast Configuration Guide (Supporting R05.6.00) - Manual (Page 35)

Multi-Service IronWare Multicast Configuration Guide 23
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IP multicast boundaries
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• If the rebalancing is not configured, then link flap results in sub-optimal utilization of the ECMP
links.
• The number of paths supported by multicast ECMP would be the same as unicast ECMP which
is 32.
Enabling Multicast ECMP
The ip multicast-routing load-sharing command configures the hash based distribution among the
ECMP paths.
Once configured, this redistributes the existing flows among the available ECMP paths. However
when a new next-hop is added to the ECMP set, the traffic will not be redistributed. Once the EXEC
level command is executed, it redistributes all the IPv4 multicast flows. To configure Multicast
ECMP, use this command in the config mode.
Brocade(config-if-e10000-1/1)# ip multicast-routing load-sharing
Brocade(config-if-e10000-1/1)# ipv6 multicast-routing load-sharing
To disable load distribution among ECMP paths use the no form of the command. This will revert to
the default ECMP behavior of choosing the highest IP address neighbor from the ECMP set.
Brocade(config-if-e10000-1/1)# no ip multicast-routing load-sharing
Brocade(config-if-e10000-1/1)# no ipv6 multicast-routing load-sharing
Syntax: [no] [ip|ipv6] multicast-routing load-sharing
Enabling Rebalance
The rebalance option enables redistributing the load when a new next-hop is added. The
redistribution is based on the hash function.
Once configured, this redistributes the existing flows among the all available ECMP paths. In
addition to that whenever a new next-hop is added, some of the existing flows will be redistributed
to the new path added using the newly added ECMP path. Once the EXEC level command is
executed, it redistributes all the IPv4 multicast flows. To configure rebalancing, use the rebalance
in the multipath command.
Brocade(config-if-e10000-1/1)# ip multicast-routing load-sharing rebalance
Brocade(config-if-e10000-1/1)# ipv6 multicast-routing load-sharing rebalance
To disable rebalancing when a new next-hop is added, use no form of the rebalance command.
Brocade(config-if-e10000-1/1)# no ip multicast-routing load-sharing rebalance
Brocade(config-if-e10000-1/1)# no ipv6 multicast-routing load-sharing rebalance
Syntax: [no] [ip|ipv6] multicast-routing load-sharing rebalance
Displaying ECMP paths in RPF neighbor
The show command displays the RPF neighbor to indicate, if the neighbor is one of the ECMP
paths. If the neighbor is one of the next-hops in the PIM ECMP set then the ECMP is also included
in the output at the end.
Brocade(config)# show ip pim vrf eng rpf 130.50.11.10 226.10.10.1
Upstream nbr 55.55.55.55 on e4/1 – mroute entry – ecmp