DSCP bit and NetFlow cache

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May 30th, 2008
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I have a QoS policy configured in my WAN facing interface which forces the DSCP bit. Since NetFlow is a ingress based, I am not able to get the DSCP bit which is being set on WAN interface. Is there any way I can get the DSCP information of the traffic going out from the WAN interface.


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yjdabear Fri, 05/30/2008 - 05:43
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NetFlow can be configured to use egress accounting ("router-if# ip flow egress") if you have IOS 12.4 and some newer IOS 12.3 releases.


Caveat:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hnf_c/ch05/nfb_bega.htm

"Egress NetFlow accounting might adversely affect network performance because of the additional accounting-related computation that occurs in the traffic-forwarding path of the router."

linker.team Sat, 05/31/2008 - 02:05
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What you mean here is, egress can report about the DSCP information that is forced on the outbound traffic on the WAN interface?


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