ip precedence-3640

Unanswered Question
Mar 20th, 2008

I'm trying to forward based on IP-precedence bits


The 1700 successfully classifies packets with "ip-precedence critical" (5).

Next step is for Cisco 3640 to prioritize forwarding...how can I do this with a 3640 with older IOS image; this can be upgraded if necessary, but there is limited memory.

On the 3640, do I need an IOS with QOS to "trust" the ip-precedence set on the 1700 ?

Is there a simple way to have the 3640 to forward packets with ip-precedence of 5

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Overall Rating: 5 (1 ratings)
boblutton Thu, 03/20/2008 - 09:12

THis is the route-map in use on the 1700...

It is definately setting the precedence, but when the 3640 gets the packet, how can I force it to read and prioritize the packet ?

route-map prior13net4 permit 20

match ip address 106 107

set ip precedence critical

Joseph W. Doherty Fri, 03/21/2008 - 10:39

If your 3640 IOS supports CBWFQ, on your outbound FastEthernet interface (assume Ethernet because of downsteam 3750), you could first try:

policy-map Yourname

interface Fastethernet 0

service policy output Yourname


class-map yourclassname

match precedence critical

policy-map Yourname

class yourclassname

priority # (Kbps)

interface Fastethernet 0

service policy output Yourname


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