Some new IOS commands override BGP's default behavior in selecting a single best route. In my case I need to load-balance eBGP routes to multiple desinations for redundancy & failover. IOS commands are: - maximum-paths X - this is a global command.
There's a command to load-balance (Cisco's words) unequal cost links:
- bgp dmzlink-bw
Has anyone used these in production? I'm looking for any gotchas or caveats.
To use either of these you will need to enable BGP multipath. That I have had expereience with and it was a scrotum tightening moment. Resource intensive is not the word. I sat in horror is the console went into outer space... it was some 5-8 minutes before I got the prompt back and could clear the sessions. Eh... emergency situs make maniacs of us all. If you have a chance to model this on non-prod gear, I would wholeheartedly recommend it.
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