From: Anthony Kirkham [mailto:[email protected]] Sent: Tuesday, October 04, 2011 8:24 PM To: George, Wes; [email protected] Subject: Re: [GROW] Final feedback please - kirkham-private-ip-sp-cores
George, I have not included discuss of implications for an IS-IS hidden core. I agree with your comments, however, I thought that discussion was moving a little away from the core topic. well... I was making the suggestion based on the following text from the draft: A second approach to preventing external access to the core is IS-IS core hiding. This technique makes use of a fundamental property of the IS-IS protocol which allows link addresses to be removed from the routing table while still allowing loopback addresses to be resolved as next hops for BGP. The technique prevents parties outside the AS from being able to route to infrastructure addresses, while still allowing traceroutes to operate successfully. IS-IS core hiding does not have the same practical requirement for the core to be addressed from a small number of contiguous address blocks as with iACLs. I realize that you're suggesting it as an alternative to using 1918 space as a means to protect the core links, but it has some of the same problems. If you don't plan to discuss at least the commonalities of the problems between the two options because it moves away from the core topic, then I would remove this paragraph altogether. Otherwise, I think you can get away with adding a line or two regarding the limitations of "...while still allowing traceroutes to operate successfully..." Possibly something as simple as "but care must be taken to ensure that traceroutes are using source and destination addresses that all of the routers on the path have in their routing table." Thanks Wes ________________________________ 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.
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