Route traffic by selective tcp port ?

Unanswered Question

Hi All,

Can I route traffic on either a layer 3 device whilst being selective about the destination port ??

I have been asked if I can route all MSN Messenger traffic via another ISP route (rather than blocking it altogether), freeing up valuable bandwidth on our main web link.

I think that the port is 1863 for MSN ? is there a way of doing this ??



I have this problem too.
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Edison Ortiz Fri, 06/22/2007 - 05:46

You need to implement Policy Based Routing and apply it at the ingress interface of the L3 device.

Your PBR would look like this:

ip access-list extended MSN

permit tcp any any eq 1863

route-map MSN permit 10

match ip address MSN

set ip next-hop [ISP next hop]

[ingress interface]

interface f0/0

ip policy route-map MSN

Hi EdisonOrtiz,

Many thanks for your reply.

I've tried implementing this onto both a 3750 & 3560 switch but to no avail. I don't seem to be able to input the 'IP POLICY ROUTE-MAP MSN' statement into the desired interface, it just display's unrecognised command. So, I tried implementing it into the VLAN interface which is accepted but then I see no traffic matching the access-list.

I must be doing something silly here ...


Edison Ortiz Sun, 06/24/2007 - 10:19

You need to change the SDM in the switch to sdm prefer routing and then reboot.

royalblues Mon, 06/25/2007 - 07:48

Which image are you running on the switch,

ipbase or IP services?

Can you post sh ver and sh runn


Edison Ortiz Mon, 06/25/2007 - 10:10

The policy-based routing can only be applied on routed interfaces. If you are trying to apply it on a L2 switchport interface, it won't work. You need to apply at the SVI (Switch Virtual Interface) of the respective VLAN.


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