06-12-2002 10:25 AM - edited 03-01-2019 10:09 PM
Hi All,
I have 2 serial links to my data center that I want to do policy routing
across. The data from interface ethernet 0 will be routed out serial 0,
and the data from ethernet 1 will be routed out serial 1. The problem
that I expect to happen is at the data center. How do I ensure that the
data bound for ethernet 0 from the data center will be sent on the same
link that it was sent on (and vice-versa). I would like to do this without
manipulating the data center routers. (I suspect I'll have to force eigrp
routing updates for these networks out their perspective serial interfaces,
but I don't know how to do this.)
e0 - - s0 ---- RouterB
RouterA
e1 - - s1 ---- RouterC
Routers B and C are on the same LAN network at the data center and I don't
want the data bound for e0 come from RouterC, or if going to e1, it shouldn't
go thru RouterB.
Any help is appreciated,
Bob
06-13-2002 05:53 AM
Hi Bob
The solution to your problem is depending on what ways you have to influence the routing tables on Router B and Router C. You wrote that you have EIGRP running between A, B and C. I am not an EIGRP pro, but you might start with:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios100/eigrp/58898.htm#xtocid1179315
and
http://www.cisco.com/warp/public/105/34.html
"distribute-list access-list-number out [interface-name | routing-process | autonomous-system-number] " should do the job:
Say:
E0: 192.168.1.1/24
E1: 192.168.2.1/24
RouterA:
access-list 1 deny 192.168.1.0 0.0.0.255
access-list 1 permit any
access-list 2 deny 192.168.2.0 0.0.0.255
access-list 2 permit any
router eigrp 1
network <...>
distribute-list 1 out s1
distribute-list 2 out s0
Fritz
06-13-2002 07:54 AM
Thanks, Fritz. This looks like a solution for me. -Bob
06-14-2002 04:26 AM
Hi.
Fritz's solution will work, but if you need some redundancy you can get into trouble. Imagine that one of the serials goes down... You will loose conncectivity to the network that was being advertised on that serial!
It would be much better if you could manipulate routing metrics at the datacenter router.
Rgds,
NM
06-14-2002 06:53 AM
This would work, but I'd suggest allowing a default or larger prefix covering all the routes through both serials, so that if one fails, the other can pick the traffic up.
Russ
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