Require Help in ......Load Balancing

Unanswered Question
Feb 15th, 2010


Scenario: My HO and branch is conencted with SP1 and SP2 (MPLS) for redundancy.

               In HO SP1 is connected with BGP and SP2 is conencted with static route.On Branch side having static routes for SP1.If SP1 link fail, then we  remove SP1 route and add SP2 route.

I want to use both the link using load balancing.Is there any workaound?

Pls find the attachment for more clarrification..

I have this problem too.
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Giuseppe Larosa Mon, 02/15/2010 - 05:06

Hello Arjun,

on the branch site side it is enough to have both static routes installed on the router this will provide you load balancing in outbound direction from remote site.

However, with static routes it is difficult to say when something goes wrong in the middle or on remote side.

I see from picture you have a C2811 on remote site. So I see two options:

a) using reliable static routing with IP SLA to make smart decisions


b) move to eBGP at least SP1 link on remote site, possibly both.

then  combination of commands including one hidden command could give load balancing over BGP sessions

router bgp xx

maximum-paths 2

bgp bestpath multipath-relax

without second hidden command, the two BGP routes coming from a different AS number would not be installed both.

Second option requires cooperation with ISP to setup the eBGP sessions

Hope to help


arjunsawant Thu, 02/18/2010 - 03:37

Hi giuslar.......Thanx for your reply...

I tried my requirement using other ways using performance routing.

The problem is that my traffic is shared but i am not getting inbound traffic on secondary link..

Pls find the attachment which i apply on my router...

Giuseppe Larosa Thu, 02/18/2010 - 06:02

Hello Arjun,

>> The problem is that my traffic is shared but i am not getting inbound traffic on secondary link..

this can be expected you can try to influence return path but actually you can get this

Even if you were using BGP you could end up with a similar result.

Currently you are using Performance routing with static routes.

Hope to help


arjunsawant Fri, 02/19/2010 - 20:42


I have one query that using IP SLA we can achieve link failure but link load balancing how can we achive,because in routing table only one best route

is available..


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