Wes,
That is a good suggestion and I will add it.
Thanks
Tony K
On 5/10/11 10:54 PM, George, Wes wrote:
*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
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