Ip Multicast Routing Configuration Guide, Cisco Ios Xe Release 3Se (Catalyst 3650 Switches - Cisco Catalyst 3650 Configuration Manual

Enabling ECMP Multicast Load Splitting
The next-hop-based S-G-hash algorithm provides more flexible support for ECMP multicast load splitting
than S-hash algorithm and eliminates the polarization problem. Using the next-hop-based S-G-hash algorithm
for ECMP multicast load splitting enables multicast traffic from devices that send many streams to groups or
that broadcast many channels, such as IPTV servers or MPEG video servers, to be more effectively load split
across equal-cost paths.
SUMMARY STEPS
1. enable
2. configure terminal
3. ip multicast multipath s-g-hash next-hop-based
4. Repeat Steps 1 through 3 on all the routers in a redundant topology.
5. end
6. show ip rpf source-address [group-address]
7. show ip route ip-address
DETAILED STEPS
Command or Action
Step 1
enable
Example:
Router> enable
Step 2 configure terminal
Example:
Router# configure terminal
Step 3
ip multicast multipath s-g-hash
next-hop-based
Example:
Router(config)# ip multicast
multipath s-g-hash next-hop-based
Step 4 Repeat Steps 1 through 3 on all the routers
in a redundant topology.
Step 5
end

IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)

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IP Multicast Optimization: IP Multicast Load Splitting across Equal-Cost Paths
Purpose
Enables privileged EXEC mode.
• Enter your password if prompted.
Enters global configuration mode.
Enables ECMP multicast load splitting based on source, group, and
next-hop-address using the next-hop-based S-G-hash algorithm.
• Because this command changes the way an RPF neighbor is selected,
it must be configured consistently on all routers in a redundant topology
to avoid looping.
Be sure to enable the ip multicast multipath command on the
Note
router that is supposed to be the receiver for traffic from more than
one incoming interfaces, which is opposite to unicast routing. From
the perspective of unicast, multicast is active on the sending router
connecting to more than one outgoing interfaces.
--
Exits global configuration mode and returns to privileged EXEC mode.
OL-29890-01