Route Health Injection

[drizze]

Anyone using either the IOS SLB or Cat6k CSM

Route Health Injection (RHI) feature? Can anyone

explain how this is different than anycast, or is it

actually anycast? It appears to be a limited form

of anycast to me.

http://www.cisco.com/public/cons/isp/essentials/ip-anycast-cmetz-03.pdf

Is anyone implementing anycast with a different

product or feature set?

[a-vazquez]

Not familiar with either but found some resources that look like they're worth reading:

http://www.cisco.com/univercd/cc/td/doc/cisintwk/intsolns/mcst_sol/anycast.htm#92946

and

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/cfgnotes/csm/helthmon.htm

[ngorenko]

when you use RHI, it adds in the routing table of MSFC static route (pointed to VIP address of servise), in case of servise is failed, it removes this route from routing table.

[drizze]

How does it detect that the service has failed? Are you currently using this in a production environment? Does one have to configure the /32 host route as an alias on the loopback interface on the servers that hold the VIP? Any other configuration details? Any problems/caveats using this method?

[ngorenko]

Hi Andre,

yes, we are using this in productive network. There are two possibilities to use it. You can say that VIP will be advertised permanently, or you can configure it together with probes. In this case probes checks the availability of service, if service down, CSM will remove the route from routing table.