[c-nsp] BFD for static routes

[Bruce Pinsky]

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Phil Bedard wrote:
> That's really the "killer app" for this so to speak, is in a L2 metro  
> scenario where you can't propagate the customer link-state back to the  
> terminating L3 router.   Even the lowest end Cisco router runs BGP  
> these days, so I've used that in the past with private ASs for  
> customers dual-homed, but that requires more configuration and  
> monitoring, etc.  The other option is GRE tunnels but that isn't a  
> very good solution imho.  BFD seems like a better option to me.  It's  
> supported by Juniper, but Cisco seems to only have support in IOS XR.
> 
> I guess a question to pose to Cisco is what takes more CPU, BFD or IP  
> SLA?  If they are the same, IP SLA (reliable static routes) is  
> certainly an option.
> 

It's supported in more than XR:

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fs_bfd.html#wp1240666

In fact, echo mode is supported on some platforms as well now.

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bep

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