RIP, route failure, IP SLA

Scheffer · ‎07-24-2009

I have asked a few questions here regarding one of my ongoing network designs and have received some very helpful answers. I now have another question (or two). (BTW, I don't require EIGRP or OSPF on this network, RIP can handle it just fine)

When using RIP, it is my understanding that when a route is removed from the table due to a link going down, when the link comes back up, the route will be automatically reinstated, whereas if it were a static route it would have to be re-added manually.

I plan on using a combination of RIP, floating static routes, and IP SLA tracking to ensure transparent failover connectivity (from one set of WAN links to another) in the event of a physical or logical link failure.

My question is, does IP SLA tracking remove AND reinstate static routes? Basically, I want to know if I could eliminate RIP all together and just use IP SLA to ensure that the static routes are removed when in the event of a link failure and reinstated when the link comes back up (either logically or physically). Please let me know thanks.

Joseph W. Doherty · ‎07-25-2009

"My question is, does IP SLA tracking remove AND reinstate static routes?"

It can.

More information about this feature can be read here: http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html

PS:

BTW, statics can also go/come without this feature. For instance, when the static uses either a destination of either a connected media or next hop on a connected media that physically goes up/down (link failure). There are also other Cisco features to handle path failures, for example you might read http://www.cisco.com/en/US/tech/tk801/tk133/technologies_tech_note09186a008009457d.shtml

If your situation might be more than one router, you might also review interface tracking options and the enhnaced versions which also uses IP SLAs, http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/guide/fthsrptk.html