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bgp load sharing with ebgp and ibgp

abarakat77
Beginner
Beginner

Hi,

I see the topic was discussed many times but I can't find a solution to my problem

so I have two routers, RT1 and RT2, the routers can reach each by two ways:

* a ISP L3 service, the two routers made a ebgp session with the ISP's CE router

* a ISP L2 service, the two routers made a ibgp session between them directly

I can't figure out to made load sharing on the two links, I see ebgp is preferred, I'm looking for the tricks

to tell bgp to use the two links

a example of prefix selection on RT1:

RT1#sh ip bgp 10.132.128.100

BGP routing table entry for 10.132.128.0/22, version 24

Paths: (2 available, best #2, table default)

Multipath: eBGP iBGP

  Not advertised to any peer

  Refresh Epoch 1

  Local, (received & used)

    10.132.192.1 from 10.132.192.1 (10.132.97.1)

      Origin incomplete, metric 0, localpref 100, valid, internal

  Refresh Epoch 1

  65000 65500, (received & used)

    172.22.190.1 from 172.22.190.1 (172.22.190.1)

      Origin incomplete, localpref 100, valid, external, best

on RT2, the network 10.132.128.0/22 is coming from OSPF redistribution

I already tried to add "bgp bestpath as-path ignore", enable multipath on ebgp/ibgp

Thanks for any tips

14 Replies 14

Joseph W. Doherty
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Each of routers, RT1 and RT2, each have a single eBGP link?  They share their BGP via iBGP?

eBGP, from RT1 and RT2 are to same or different AS?

How does your outbound traffic get (route) to RT1 and/or RT2?

What platforms (and IOS version) are RT1 and RT2?

each router have only one ebgp link

they don't share, at least it's not the goal, the two routers are in distinct locations.

ebgp from the two routers made with  the same ISP's AS

RT1 is a cisco router 2901

RT2 is a nexus 5500 with L3 daughter card

thanks

they don't share, at least it's not the goal, the two routers are in distinct locations.

Was this intended as an answer to my question "How does your outbound traffic get (route) to RT1 and/or RT2?"

If the two routers are at distinct locations, and the goal is not to share, what kind of load sharing are you trying to accomplish?