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ip default next-hop (source based routing)

Posted on 2014-04-07
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Last Modified: 2014-04-08
So on a cisco router i can configure

set ip next-hop verify-availability 10.1.1.1 1 track 10

but I cant configure

ip default next-hop, with a tracking object attached.

Any ideas how I can get the same effect.

I want to say

if source is subnet A then use default route of X
if source is subnet B then use default route of Y

now that can fail over find if the router x or Y goes down, but not if the route upstream of these has issues.
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Question by:Aaron Street
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6 Comments
 
LVL 17

Expert Comment

by:pergr
ID: 39985338
This is what you want to do:
http://www.cisco.com/c/en/us/support/docs/ip/ip-routed-protocols/48003-pbrtracking.html

Now, your questions are mixing "source based routing", and "default route". Note that "default route" is always for the "destination ip address", and not the "source ip address".
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LVL 16

Author Comment

by:Aaron Street
ID: 39985436
Trouble is this will over ride the routing table.

So say Router X has 4 connections,

one from Subnet A
one from subnet B

One to subnet X (default route)
One to subnet Y (default route)

If a packet comes in from subnet A destined for subnet B then I want it to go out the interface to B

but setting a next hop in a policy map would over ride this as with 4 connections it would have to be applied to the incoming interface of A.

This is why I wanted to use "default next-hop", in the route map as it apply only if there is no more specific route in the routing table.
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LVL 17

Expert Comment

by:pergr
ID: 39985558
Do a

route-map alpha permit 5


With rules for routing between A and B, which will kick in before the policy based routing.
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LVL 16

Author Comment

by:Aaron Street
ID: 39985578
yes but this means a route map to deal with tons of internal routes that would need to be applied to each internal interface to deal with all the internal routes.

At the moment OSPF deals with all the dynamic routing, I don't want to have to manually set this all up as route maps.
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LVL 17

Accepted Solution

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pergr earned 2000 total points
ID: 39985594
You usually do not need to enter each route specifically.

For example, you can have a rule matching destination 10./8 (10.0.0.0 255.0.0.0) as the "permit 5". Most likely two rules (10./8 and 192.168./16) are enough.

Another option, of course, is to do the routing between A and B on some L3 switch inside the router.
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LVL 16

Author Comment

by:Aaron Street
ID: 39985654
you are right, but when the primary router I am talking about is the core switch and a few hundred routes and vlans terminating on it.....

Oh actually of course,

Just 3 rules  that says

Rule 1 For any internal destination then rule 1 simple permit.
Rule 2 For any source A use next hop X
Rule 3 For any source B use next hop Y

And then apply it to the incoming interfaces.
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