Multicast Problem

Answered Question
Nov 11th, 2009

Hello, I am having a strange problem in a multicast network, when i do "show ip mroute count" i see the following:

Group: 224.0.53.24, Source count: 1, Packets forwarded: 4215072, Packets received: 4218034

RP-tree: Forwarding: 0/0/0/0, Other: 2962/101/2861

Source: 156.48.126.117/32, Forwarding: 4215073/255/165/301, Other: 4215073/0/0

As you can see there is a diference on forwaded packets and received, but i dont have on the "Other: 4215073/0/0" any counters for RPF failed or other drops, others mcast groups are ok, so the big question is, what is happening to this packets?

Note - in cpu history i dont have any high value

I have this problem too.
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Correct Answer by simontibbitts about 7 years 2 months ago

Hello Vladimir.

I make that 2962 packets you are missing. You can see in your stats that these have been counted:

Other: 2962/101/2861

This means 101 packets were dropped due to RPF failure and 2861 packets were dropped due to other reasons (OIF-null, rate-limit etc)

To check the 2861 packets you can check to see if you have multicast rate limiting enabled and you can also check the downstream join/IGMP join to see it's uptime etc..

Simon

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Correct Answer
simontibbitts Wed, 11/11/2009 - 03:18

Hello Vladimir.

I make that 2962 packets you are missing. You can see in your stats that these have been counted:

Other: 2962/101/2861

This means 101 packets were dropped due to RPF failure and 2861 packets were dropped due to other reasons (OIF-null, rate-limit etc)

To check the 2861 packets you can check to see if you have multicast rate limiting enabled and you can also check the downstream join/IGMP join to see it's uptime etc..

Simon

vladimirsaltao Wed, 11/11/2009 - 03:46

Hi simon,

thanx for the fast reply, almost after posting i saw my error in not looking for the RP-tree counters .

Vsaltao

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