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Re: Route Reflector architecture and how to get small customer blocks in to BGP?
On Jan 28, 2007, at 9:06 AM, Joe Provo wrote:
For example, if you're redistributing routes into BGP and coloring with a community based on a route match policy and some of those routes aren't in the policy snapshot then they won't be "colored" with communities or the like and may be leaked or not advertised otherwise. This is particularly ugly when you've employed "implicit permit" external advertisement policies where routes that aren't tagged with some value are passed by default.
Two lessons learned for me:
o If you're going to use redistribution - or not - ensure that all external advertisement policies require explicit match of advertise communities and default is to deny
o Don't unnecessarily touch policies or blindly overwrite them periodically, utilize incrementally updated prefix lists as much as possible
Given the two conditions above I'm not as wary of redistribution and it may ease configuration managed as Joe suggests.