Policy Based Routing:

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Jun 3rd, 2008
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Hi,I need your assistance,


I support a kind of network that has two separate links to each site-one of the links is known to be more reliable than the other,

There is some particular kind of traffic that is more critical than all other traffic.It comes from a particular source address from the remote sites,normally a machine with ip address 172.31.x.23/24,it would head for example to the HQ with ip address 172.31.124.61/30 and 172.31.124.67/30,these ips represent the diffrent links.Now i want the traffic to use the 172.31.124.61/30 as the preffered path,Am running OSPF and have put OSPF cost on each of the links and it works okay.


My problem is just getting traffic from a paricular ip to get to particular destination IP.In this case 172.31.x.23/24 to use the IP 172.31.124.61/30.


I really hope i have put my point out in a clear way.I am willing to explain more if not clear.


Please help.

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royalblues Tue, 06/03/2008 - 02:57
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manipulating ospf cost would trigger routing of all traffic via one preferred link.


You can use PBR on the inside interface and force the traffic (matched via the policy u define) onto a particular link.


access-list 101 permit ip


route-map PBR permit 10

match ip address 101

set ip next-hop


interface

ip policy route-map PBR


HTH

Narayan

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