PIM DSCP marking

Unanswered Question
Mar 22nd, 2007
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I'm trying to find out what PIM gets marked as in terms of IP precedence or DSCP. Can't find anything on CCO.

Does anyone know?

PIM adjacency is dropping when a link is congested so I want to prioritse the PIM keepalives.

Mar 22 09:49:09.712: %PIM-5-NBRCHG: neighbor 10.x.x.x DOWN on interface Serial0/0/0 (vrf default) non DR

Mar 22 09:49:09.796: %PIM-5-NBRCHG: neighbor 10.x.x.x UP on interface Serial0/0/0 (vrf default)

So is PIM marked by default?

If so what DSCP ?

If it's not what can I match on in order to classify it?


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Overall Rating: 5 (1 ratings)
Harold Ritter Thu, 03/22/2007 - 07:39
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PIM messages are set to precedence 6 as most other control protocols.

If you do have QOS enable, make sure you reserve bandwidth for control protocols.

Hope this helps,

andrew.obrien Sun, 04/22/2007 - 16:45
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Hi Hritter,

Do you know of any documentation to support precedence 6 marking on PIM messages?

Are PIM register messages also marked precedence 6?

Harold Ritter Sun, 04/22/2007 - 18:08
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I'm personally not aware on any such document but I would say that except for the PIM register message, which is marked as IP precedence 0, all PIM messages are marked as IP precedence 6, including the register-stop message.

Hope this helps,


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