10-01-2013 06:19 AM - edited 03-04-2019 09:11 PM
Dear Team,
we have our own ASN and /24 public IP advertise by ISP using BGP.
two WAN Links from ISP to us.
---------------------->
Our Router ISP Router
---------------------->
we want to configure auto failover if primery link goes down backup wiil pick up.
Please assist
Regards
10-01-2013 10:58 AM
10-01-2013 12:22 PM
Dear MS,
thanks for post,
that post has multiple ISP BGP peering.
we have only one ISP, both links are terminated on same router at ISP side.
please assist.
10-01-2013 07:04 PM
you could try using BGP weight. you might need a back to back link between router for IBGP.
I've configured a site before with your scenario.
10-01-2013 01:20 PM
You could consider using IP SLA. Another thing is you could peer with the ISP using loopback interfaces on both sides and then configure static routes via the two links. Set the admin distance on the primary lower than that on the backup interface. That should work perfectly for failover.
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10-01-2013 02:35 PM
10-01-2013 07:24 PM
When weight is applied, it affects the router as a whole, not just a link. In this scenario, where you have one router with 2 links connected to the same router of the ISP, then your best choice of design is peering with the loopback on the two routers. Then configure two static routes on each link, setting the AD of the primary lower than the backup. It's tested, proven and Cisco recommended.
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