Mailing List Archive

BGP Multipath
Hello Gentlemen,

I wanted to configure whether BGP multipath feature work for/install a
route learned from the same AS but eBGPand iBGP neighbors.

for example, I have four routers A, B, C & D. Router A and B are iBGP
neigbors in ASN100 and a prefix 10.0.0.0/8 attache to both. Router C and D
are iBGP neighbors in ASN100. Router A has an eBGP with Router C and Router
B has an eBGP neighborship with Router D.
Now Router A receives prefix 10.0.0.0/8 from Router C via eBGP and from
Router B via iBGP. In this scenario, Router A install the prefix in routing
table that learned from Router C because it learned via eBGP. So the
question is can I have both eBGPand iBGP paths install in the routing table
with the help of multipath feature? I tried but it didn't work.

In a nutshell, i wanted to ask if Multipath work for a prefix that being
learned from eBGP and iBGP?
From my understanding, all the best path criteria have to tie before
multipath comes in picture.

Regards
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Re: BGP Multipath [ In reply to ]
You need eiBGP multipath for this.

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/15-s/irg-15-s-book/irg-eibgp-multipath-for-nonvrf-interfaces.html


Thx,
R.

On Thu, Aug 13, 2020 at 1:54 AM Yham <yhameed81@gmail.com> wrote:

> Hello Gentlemen,
>
> I wanted to configure whether BGP multipath feature work for/install a
> route learned from the same AS but eBGPand iBGP neighbors.
>
> for example, I have four routers A, B, C & D. Router A and B are iBGP
> neigbors in ASN100 and a prefix 10.0.0.0/8 attache to both. Router C and D
> are iBGP neighbors in ASN100. Router A has an eBGP with Router C and Router
> B has an eBGP neighborship with Router D.
> Now Router A receives prefix 10.0.0.0/8 from Router C via eBGP and from
> Router B via iBGP. In this scenario, Router A install the prefix in routing
> table that learned from Router C because it learned via eBGP. So the
> question is can I have both eBGPand iBGP paths install in the routing table
> with the help of multipath feature? I tried but it didn't work.
>
> In a nutshell, i wanted to ask if Multipath work for a prefix that being
> learned from eBGP and iBGP?
> From my understanding, all the best path criteria have to tie before
> multipath comes in picture.
>
> Regards
> _______________________________________________
> cisco-nsp mailing list cisco-nsp@puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>
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Re: BGP Multipath [ In reply to ]
On Thu, 13 Aug 2020 at 00:56, Yham <yhameed81@gmail.com> wrote:
>
> Hello Gentlemen,

There are women on this list too.

> Router A and B are iBGP
> neigbors in ASN100 and a prefix 10.0.0.0/8 attache to both. Router C and D
> are iBGP neighbors in ASN100. Router A has an eBGP with Router C and Router
> B has an eBGP neighborship with Router D.

How does Router A have an eBGP session with Router C if they have the same ASN?

James.
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