BGP Default Route & HSRP

[j-tucker]

We have an internet connection to 2 different ISP's and use HSRP to track the interface to each ISP. If an interface fails it changes to the other router.

What we found on one link (which is a LES100) the link may fail between NTU's but the NTU will keep the interface up on the router so HSRP does not change.

We are reviewing the best option to provide automatic failover.

In the latest IOS you can track a route. How would this work with BGP because if a ISP failed the router will still learn the routes via iBGP from the other router.

Would a better option be to have OSPF instead of static routes and have the default route from the ISP redistributed into OSPF thereby in the event of any part of the link to the ISP failing the default route will always send it to the correct router.

[prafuljaded]

You need to add the config command

' track 2 interface ip routing | line-protocol'

and config-if command ' standby track 2 decrement

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094e8c.shtml

Praful

[j-tucker]

Yes but how would that work when you have 2 ISP's and 2 screen routers. If a ISP fails then screen router still learns the internet routes via iBGP from the other screen router. So if you track a route it still stays in the routing table.

[joyride_us]

Hi,

No problem, I guess your screen routers either run a routing protocol so that they can exchange traffic (or better : a default route pointing to each other).

Not sure I am answering your question there!