Re: Excessive IGMP Snooping statistics.

seanallanmurphy · ‎11-21-2013

For quite some time now, I have been getting the following in my logs:

Nov 21 15:40:42.390: %MCAST-SPSTBY-6-ETRACK_STATS_LIMIT_EXCEEDED: Number of entries in IGMP snooping explicit-tracking statistics has exceeded the maximum limit (32000)

Nov 21 15:40:42.399: %MCAST-SP-6-ETRACK_STATS_LIMIT_EXCEEDED: Number of entries in IGMP snooping explicit-tracking statistics has exceeded the maximum limit (32000)

Nov 21 15:40:59.614: %MCAST-SP-6-ETRACK_STATS_LIMIT_EXCEEDED: Number of entries in IGMP snooping explicit-tracking statistics has exceeded the maximum limit (32000)

Nov 21 15:40:59.611: %MCAST-SPSTBY-6-ETRACK_STATS_LIMIT_EXCEEDED: Number of entries in IGMP snooping explicit-tracking statistics has exceeded the maximum limit (32000)

This is on our core switch, a 6509E with redundant 720Sup modules and version pasted below:

Cisco IOS Software, s72033_rp Software (s72033_rp-IPSERVICESK9_WAN-VM), Version 12.2(33)SXI11, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Compiled Fri 15-Feb-13 15:28 by prod_rel_team

ROM: System Bootstrap, Version 12.2(17r)SX5, RELEASE SOFTWARE (fc1)

Thor uptime is 4 weeks, 1 day, 20 hours, 21 minutes

Uptime for this control processor is 4 weeks, 1 day, 20 hours, 20 minutes

Time since Thor switched to active is 4 weeks, 1 day, 20 hours, 20 minutes

System returned to ROM by s/w reset at 07:53:48 ADT Thu Aug 22 2013 (SP by address error at PC 0x734BB5A0, address 0x0)

System restarted at 16:34:29 ADT Tue Oct 22 2013

System image file is "disk0:/s72033-ipservicesk9_wan-vz.122-33.SXI11.bin"

Last reload reason: reload

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cisco WS-C6509-E (R7000) processor (revision 1.5) with 516096K/8192K bytes of memory.

Processor board ID SMC133200H7

SR71000 CPU at 600Mhz, Implementation 1284, Rev 1.2, 512KB L2 Cache

Last reset from s/w reset

52 Virtual Ethernet interfaces

148 Gigabit Ethernet interfaces

1917K bytes of non-volatile configuration memory.

65536K bytes of Flash internal SIMM (Sector size 512K).

Configuration register is 0x2102

Occasionally, our processor usage will also spike to 99%. I'm not sure if that is related, but it began occuring around the same time. What further information would the community need to point me in a direction to start rectifying this? Thanks so much!

Richard Primm · ‎11-23-2013

Hi Sean,

Nov 21 15:40:42.390: %MCAST-SPSTBY-6-ETRACK_STATS_LIMIT_EXCEEDED: Number of entries in IGMP snooping explicit-tracking statistics has exceeded the maximum limit (32000)

The above log message is written because the number of explicit-tracking statistics entries is bounded to avoid monopolizing of system resources by IGMP/MLD snooping. The explicit-tracking statistics database maximum size is set to the same as that of explicit-tracking limit.

The statistics are split into two banks: permanent and volatile. The statistics entries will be stored permanently (volatile) until the permanent entries threshold is reached, after which the statistics will be stored temporarily up to the database maximum size. When the size of the database exceeds the permanent threshold, a group will be removed on receiving an IGMP/MLD leave. Groups can be removed whether they were installed above or below the permanent threshold. If the number of statistics entries grows beyond the maximum size of the database, then no statistics will be stored for any newly formed groups.

You can disable ip igmp snooping explicit-tracking by the following

1) Configure "no ip igmp snooping explicit-tracking"

2) Configure "ip igmp snooping limit track 0" on global.

3) After ET is disabled, please do a "clear ip igmp snooping statistics".

Here is a reference URL (please make sure you copy and paste the entire link to the browser):

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/snooigmp.html#wp1062242

HTH

Luke

zeuscyril · ‎12-19-2013

hi sean,

i am also having the same log and same issue did the above configuration solved your issue or any other solution for that

thanks

cyril

seanallanmurphy · ‎12-19-2013

I haven't been able to fully test it as our traffic load nearly hits the floor around Christmas time. We are a university and all students and most staff are no longer On campus until the new year.

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ABDUL RAHIMAN K.M · ‎02-28-2014

Hope your multicast usage exceeds the limit, C6509 support 32K igmp groups only. But I'm wondering how many multicast receivers are attched to that switch.?

andy!doesnt!like!uucp · ‎09-12-2018

Hello

for the 6500E sup720 it's still configurable upto 128K

Current number of Statistics entries : 32427
Configured Statistics database limit : 128000
Configured Statistics database threshold: 102400
Configured Statistics database limit : Not exceeded
Configured Statistics database threshold: Not exceeded