BGP/HSRP failover design

[paolo.acquaviva]

Hello all,

I have the following scenario:

• 2 CPE routers are interconnected through a link in which there is configured iBGP.
  
• both of two are connected to LAN and HSRP protocol is activated.
  
• Each CPE is connected to a different ISP (eBGP session activated with ISP routers)
  
• HSRP tracking on IP SLA reachability of eBGP peer is configured.
  

I have some doubts about the traffic flow if a failure occurs on ISP link connected to the HSRP active router.

I think that for HSRP protocol the standby router becomes active but unless the eBGP in the ex active router converges and this sends iBGP update out the best path for external routes is always the ex active router. In the meanwhile the new active router tries to send the traffic through the iBGP link, not to the ISP. Is it correct?

Thanks a lot.

Kind regards.

Paolo

[milan.kulik]

Hi,

does it make sense for the secondary router to prefer routing over iBGP?

Shouldn't you configure it to prefer routing over it's ISP all the time?

But still there might take some time (BGP convergence) for the incoming traffic to start preferring the secondary router in a case of primary connection problem.

BR,

Milan