10-02-2009 09:26 AM - edited 03-01-2019 02:14 PM
I'm trying to figure out why everytime that I see a policy-map configured, it doesn't take into account the routing protocols, why is that?
I want to remark all traffic coming into our network from our BGP upstreams to be dscp 0, but I'm afraid of messing up the BGP updates. Is this dealt with automatically or do you have to compensate for BGP in the QoS policy?
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10-14-2009 08:22 AM
In the case as explained, remarking inbound BGP, along with all other packets, to be DSCP 0 shouldn't cause any issue with those BGP packets.
10-02-2009 01:22 PM
Hello Travis,
it would be safer to deny BGP traffic an ACL like
access-list 111 deny tcp any any eq bgp
access-list 111 deny tcp any eq bgp any
access-list 111 permit ip any any
can be used to define what to remark to DSCP0
Hope to help
Giuseppe
10-13-2009 01:32 PM
One possible reason, routing protocols tend to be locally sourced and often Cisco treats locally source traffic differently from transit traffic.
For example, when you write "I want to remark all traffic coming into our network from our BGP upstreams to be dscp 0 . . .", would this be the same device that accepts the BGP packets? If so, why would there be a need to remark them?
10-14-2009 08:02 AM
I want to remark all external traffic entering the network to be dscp 0. I do not want this to affect the bgp communications between the two routers though. This is the same device that is accepting the bgp packets from the upstream device.
10-14-2009 08:22 AM
In the case as explained, remarking inbound BGP, along with all other packets, to be DSCP 0 shouldn't cause any issue with those BGP packets.
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