Cisco Catalyst 4500 Series, Software Configuration Manual

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 38 Configuring IP Multicast
Monitoring and Maintaining IP Multicast Routing
To enable IP multicast multipath, perform this task:
Note
The ip multicast multipath command load splits the traffic but does not load balance the traffic. Traffic
from a source uses only one path, even if the traffic far outweighs traffic from other sources.
Configuring load splitting with the ip multicast multipath command causes the system to load split
multicast traffic across multiple equal-cost paths based on source address using the S-hash algorithm.
When the
ip multicast multipath command is configured and multiple equal-cost paths exist, the path
in which multicast traffic travel is selected based on the source IP address. Multicast traffic from
different sources is load split across the different equal-cost paths. Load splitting does not occur across
equal-cost paths for multicast traffic from the same source sent to different multicast groups.
The following example shows how to enable ECMP multicast load splitting on a router based on a source
address using the S-hash algorithm:
Switch(config)# ip multicast multipath
The following example shows how to enable ECMP multicast load splitting on a router based on a source
and group address using the basic S-G-hash algorithm:
Switch(config)#
ip multicast multipath s-g-hash basic
The following example shows how to enable ECMP multicast load splitting on a router based on a
source, group, and next-hop address using the next-hop-based S-G-hash algorithm:
Switch(config)# ip multicast multipath s-g-hash next-hop-based
Monitoring and Maintaining IP Multicast Routing
You can remove all contents of a particular cache, table, or database. You also can display specific
statistics. The following sections describe how to monitor and maintain IP multicast:
• Displaying System and Network Statistics, page 38-24
•
Displaying the Multicast Routing Table, page 38-24
• Displaying IP MFIB, page 38-26
•
Displaying Bidirectional PIM Information, page 38-27
• Displaying PIM Statistics, page 38-28
•
Clearing Tables and Databases, page 38-28
Command Purpose
Step 1
Switch# config t
Enters configuration mode.
Step 2
Switch(config)# ip multicast multipath
Enables IP multicast multipath.
Step 3
Switch(config)# end
Exits configuration mode.