Purpose
Command or Action
Enters global configuration mode.
configure terminal
Example:
Device# configure terminal
Step 2
Enables ECMP multicast load splitting based on source address using the
S-hash algorithm.
ip multicast multipath
Example:
Device(config)# ip multicast
multipath
Step 3
•
Because this command changes the way an RPF neighbor is selected, it
must be configured consistently on all devices in a redundant topology
to avoid looping.
•
This command does not support configurations in which the same PIM
neighbor IP address is reachable through multiple equal-cost paths. This
situation typically occurs if unnumbered interfaces are used. Use a
different IP address for each interface in a device on which this command
is to be configured.
•
This command load splits the traffic and does not load balance the traffic.
Traffic from a source will use only one path, even if the traffic far
outweighs traffic from other sources.
--
Repeat step 3 on all the devices in a
redundant topology.
Step 4
Exits global configuration mode and returns to privileged EXEC mode.
exit
Step 5
Example:
Device(config)# exit
(Optional) Displays the information that IP multicast routing uses to perform
the RPF check.
show ip rpf source-address
[
group-address
]
Step 6
Example:
Device# show ip rpf 10.1.1.2
•
Use this command to verify RPF selection so as to ensure that IP multicast
traffic is being properly load split.
(Optional) Displays the current state of the IP routing table.
show ip route ip-address
Step 7
Example:
Device# show ip route 10.1.1.2
•
Use this command to verify that there multiple paths available to a source
or RP for ECMP multicast load splitting.
•
For the
ip-address
argument, enter the IP address of a source to validate
that there are multiple paths available to the source (for shortest path
trees) or the IP address of an RP to validate that there are multiple paths
available to the RP (for shared trees).
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
OL-29890-01
327
IP Multicast Optimization: IP Multicast Load Splitting across Equal-Cost Paths
Enabling ECMP Multicast Load Splitting
