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Troubleshooting IP Multicast Switching (IPMS) Troubleshooting a Device that Drops Out of an IP Multicast Stream
OmniSwitch Troubleshooting Guide September 2005 page 14-4
Is Multicast Switching enabled on your switch? If it is not enabled, you will likely notice high utilization
for the switch, and devices in the VLANs where multicast traffic is flowing will be being flooded with the
stream(s). As Multicast Switching comes standard with this release, it should be enabled.
Use the show ip multicast switching command to display the current IPMS configuration on a switch.
If it is not enabled, you will see:
-> show ip multicast switching
IPMS Configuration
IPMS State: Disabled,
Hardware Routing: Disabled,
Priority: high,
Max Ingress Bandwidth: 10,
Leave Timeout: 1,
Membership Timeout: 260,
Neighbor Timeout: 90,
Querier Timeout: 260,
Query Interval: 125
To enable it, enter:
-> ip multicast switching
Then the show ip multicast switching command will show:
-> show ip multicast switching
IPMS Configuration
IPMS State: Enabled,
Hardware Routing: Disabled,
Priority: high,
Max Ingress Bandwidth: 10,
Leave Timeout: 1,
Membership Timeout: 260,
Neighbor Timeout: 90,
Querier Timeout: 260,
Query Interval: 125
With the presence of multicast router on the network, you need to see if IP Multicast enabled switch has
this router listed as a multicast neighbor. In addition, one multicast querier should exist per network, this
querier corresponds to the one switch or router participant of the multicast domain with the lowest IP
address.
-> show ip multicast neighbors
Source IP VLAN Slot/Port Expire Type
--------------------+----+---------+------+-------
10.10.10.187 5 4/5 Never Static
The above example has a static-neighbor configured. A static-neighbor is a port configured to receive all
multicast streams on a VLAN, as well as to receive all IGMP reports for the VLAN.
If you do not see the neighbor switch in the output, as a work around you may want to add it as a Static
Neighbor and verify connectivity. See the “Configuring a Static Neighbor” section in the appropriate