Mcast Messages; Mcast-6 - Cisco III - Supervisor Engine III Message Manual

Chapter 2 Messages and Recovery Procedures

MCAST Messages

This section contains Layer 2 Multicast log (MCAST) messages.

MCAST-6

Error Message %MCAST-6-ETRACK_LIMIT_EXCEEDED: [chars] snooping was trying to
allocate more explicit-tracking entries than what allowed ([dec]
Error Message %MCAST-6-GC_LIMIT_EXCEEDED: IGMP snooping was trying to allocate more
Layer 2 entries than what allowed ([dec])
Error Message %MCAST-6-IGMP_CGMP_MODE: IGMP snooping now is running in IGMP_CGMP
mode on vlan [dec]
Error Message %MCAST-6-IGMP_ONLY_MODE: IGMP snooping now is running in IGMP_ONLY
mode on vlan [dec]
Error Message %MCAST-6-IGMP_PKT_DROPPED: IGMP: IGMP Queue full (high packet rate/CPU
busy), dropped [dec] packet(s) in last 5 minutes
OL-11469-02
Explanation The allocation of explicit-tracking entries is limited so that IGMP and MLD snooping
are prevented from consuming too many system resources.
Reduce the number of (s,g) channels or the number of receivers. When the
Recommended Action
explicit-tracking database has gone beyond its limit, new membership for any channels will not be
tracked. This condition might cause high-leave latency when those members leave a channel.
Another alternative is to increase the limit from configuration mode by entering the ip igmp
snooping limit track max-entries command. It is important to note that increasing the value of
max-entries could cause the system to fail because of high use of system resources.
IGMP snooping attempted to allocate more Layer 2 entries than the permitted amount
Explanation
specified in the message.
No action is required.
Recommended Action
The specified VLAN is running in IGMP/CGMP mode.
Explanation
No action is required.
Recommended Action
The specified VLAN is running in IGMP mode.
Explanation
Recommended Action No action is required.
The IGMP packet queue is not able to accommodate additional packets. Any additional
Explanation
packets will be dropped without processing.
Recommended Action Reduce the IGMP packet rate to prevent packets from being dropped.
Catalyst Supervisor Engine 32 PISA Cisco IOS System Message Guide, Release 12.2ZY
MCAST Messages
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