Hello Giuseppe,

The router is running BGP as the External routing-protocol & EIGRP as the internal routing protocol at the LAN end. All the EIGRP routes are getting distributed into BGP & BGP routes into EIGRP.

How do I achieve Load balancing?

Also, since these are MPLS links, teh load balancing will be applicable to the outbound trafffic alone.

Hello Deepa,

also EIGRP allows for redistributionof BGP with same seed metric.

This would allow for outbound load balancing.

I would suggest you or to use network commands under EIGRP or to use route tags if you want to go on with mutual redistribution between EIGRP and BGP.

You should be able to implement outbound load balancing also on the other side:

if the remote site has only eBGP sessions with PE nodes you may use maximum-paths 2

if remote sites are not multihomed usage of both DS3 links can be achieved by MPLS service provider.

You may want to use the same MED on advertised central site prefixes on the two eBGP sessions.

The service provider should implement

maximum paths eibgp 2

on each remote PE in address family ipv4 vrf Your.VRF and should use a different route distinguisher on the two PE nodes where the two DS3 links.

Check with SP tech people what they are doing.

Hope to help

Giuseppe

Giuseppe,

IP-CEF is enabled on our routers & bothe the links are equal cost. Doesn't this mean that for all outbound traffic from these two routers there should be 'per destination' based load-balancing done?

For the inbound traffic from MPLS, the Service-provider needs to look into this & work out on load-balancing at their end.

Is this correct?

Hello Deepa,

>> Is this correct?

yes you have per destination flow based load balancing in the outbound direction.

SP controls inbound direction

hope to help

Giuseppe

Giuseppe,

I have spoken to the Service-provider & they need us to specify the how many max paths we require.

I am not clear on this.

Hello Deepa,

BGP defaults to maximum-paths 1 also on the SP side.

in your case the max paths has to be raised to 2.

This is the answer you should give them

Hope to help

Giuseppe

Thanks Guiseppe.

Is the max path = 2 because the load balancing is done for 2 links? Also, AS configured for both the links are different. How will SP acheive this?

Can you please provide some links which can help me understand this concept better?

Hello Deepa,

look at the following the feature is named iBGP multipath for MPLS VPN

http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_bgp_ebgp_ibgp_ps6441_TSD_Products_Configuration_Guide_Chapter.html

some additional hidden command may be needed to support eBGP multipath over different peer AS

bgp as relax multi-path

(not sure about the exact syntax but yes this is possible and it is on the SP side)

I find strange you are using two different AS numbers on your routers but this can be handled.

Hope to help

Giuseppe

Thanks Giuseppe.

I am still unable to get the logic of having two differnt AS to the same location. What would happen if we configure the same AS for both the links?

Hello Deepa,

if you are using the same AS number on your routers this is fine.

I had misunderstood you ignore any comment about different AS numbers on your side.

Hope to help

Giuseppe