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BGP Failover

Engr.heis
Beginner
Beginner

Hi Guys,

Good day. I just want to tap your expertise on this matter. Our current network is being setup with a diagram below. When NYR1 BGP link going to ATT MPLS was DOWN we are not receiving the expected routes (167.1.x.x, 167.2.x.x, 167.3.x.x) to our TX router which is going to our primary link.

Our BGP neighborship with ATT(AS 39152) from TX(AS 39289) is still up at this time.

On the other hand, expected routes (167.1.x.x, 167.2.x.x, 167.3.x.x) are still being received from LA router going to secondary link. We do not have any access from any NY routers as these are being managed by ATT provider.

TX and LA router do not have any connections between them. R1 and R2 India routers are being linked by an EIGRP. 

Is there any way that we can failover to our secondary link which is the LA router going to India R2 whenever NY R1 BGP link to ATT is DOWN (167.x.x.x routes are not being received in TX router) ??

10 Replies 10

Jon Marshall
VIP Community Legend VIP Community Legend
VIP Community Legend

I don't follow. 

You say when NY R1 is down only LA receives the routes and then you ask if there is any way when the NY R1 is down you can failover to LA. 

Isn't this what is happening already ? 

Jon

Hi Jon,

We have an issue wherein NY R1 BGP link going to ATT is down, TX not receiving expected routes and the link we are still using is the primary link (going to India R1). Until NY R1 BGP link was resolved our client in NY was down.

Just want to know if there is a possibility to use the secondary link(ATT going to LA going to India R2) once the routes were not received in TX router.

Its not using the secondary link automatically (ATT going to LA going to India R2). As soon as NY R1 BGP link went up, everything went back to normal operation.

Thanks,

engrheis

Hello

I would query the advertisement from India 2 and LA bgp rtrs? 
Is india 2 actually sending all it prefixes to LA and if so LA forwarding them on to you.

Do you have any filtering negating the advertisement of these routes?

res
Paul


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This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

Hi Paul,

We need to check the filters in our production. I will get back to you when the information is available.

engrheis

Jon Marshall
VIP Community Legend VIP Community Legend
VIP Community Legend

Just to clarify a few things. 

The networks 167.1.x.x etc. are in NY ?

Are you redistributing BGP into EIGRP on TX and LA because if you are then India should see go via LA assuming the networks are in NY. 

Jon

Hi Jon,

Yes networks 167.x.x.x are in NY. We are also using redistribution for BGP routes into EIGRP on TX and LA going to India.

engrheis

Jon Marshall
VIP Community Legend VIP Community Legend
VIP Community Legend

When TX stops receiving those routes then India should only be receiving them via EIGRP from LA. 

Assuming the India routers are exchanging EIGRP routes between themselves all traffic should automatically go via the LA link. 

Are you saying this is not happening ?

Jon

Hi Jon,

Yes Jon. Unfortunately that was the case. TX router stop receiving the routes from NY when NYR1 BGP was down. Traffic was not directed to LA as our client was down just until NYR1 BGP went back and up again.

engrheis

Jon Marshall
VIP Community Legend VIP Community Legend
VIP Community Legend

Are the India routers exchanging EIGRP routes with each other ? 

Jon

Hi Jon,

Yes they are. India routers are seeing each other via EIGRP.

engrheis

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