On 6/18/14, 12:31 PM, "Philip Lavine" <source_route@yahoo.com> wrote:
I guess my question is, is it best practice to confederate or use a route reflector
Basically I want to know what an ISP would do, not a test in a LAB.
One data point that you may find useful: If you find out later that you’ve chosen incorrectly the first time around, it is FAR easier to change *from* RRs *to* Confeds than it is to do the opposite. The AS migration tools that you’d normally use to handle moving routers from one ASN to another don’t work to migrate routers from a confed ASN to a normal iBGP ASN setup, probably because the BGP machinery doesn’t know what to do with the union of the changes those things make to BGP’s default behavior, so you’re stuck with trying to find the least bad flag day way to handle renumbering ASNs out of a confed. Doing it without major traffic impact is pretty difficult since most of the options involve nuking BGP and rebuilding it to punt routers from one ASN to another, and doing this on multiple routers simultaneously in order to minimize the time when BGP is offline on multiple devices due to ASN mismatches. Size of network of course matters when considering whether this is really a potential issue for you, but since you’re asking in terms of what an ISP would do vs what works in a lab, considering large scale rather than today’s scale when determining the exit strategy is pretty important. Wes George Anything below this line has been added by my company’s mail server, I have no control over it. ----------- This E-mail and any of its attachments may contain Time Warner Cable proprietary information, which is privileged, confidential, or subject to copyright belonging to Time Warner Cable. This E-mail is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient of this E-mail, you are hereby notified that any dissemination, distribution, copying, or action taken in relation to the contents of and attachments to this E-mail is strictly prohibited and may be unlawful. If you have received this E-mail in error, please notify the sender immediately and permanently delete the original and any copy of this E-mail and any printout.