North American Network Operators Group
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Re: Cisco RFC1997 implementation clarification.

  • From: Marko Karppinen
  • Date: Tue Jul 10 05:05:53 2001 
> While researching an RFC1997 issue this morning, I made the following
> observations:

> CISCO no-export = RFC1997 NO_EXPORT_SUBCONFED
> CISCO local-as = RFC1997 NO_EXPORT

Cisco Press' Routing TCP/IP, Vol 2 explicitly states that
LOCAL_AS == NO_EXPORT_SUBCONFED. It's description of LOCAL_AS differs,
however, from the one you quoted from a Cisco web page:

"LOCAL_AS (4294967043, or 0xFFFFFF03) -- RFC 1997 calls this attribute
NO_EXPORT_SUBCONFED. Routes received carrying this value cannot be
advertised to EBGP peers, including peers in other autonomous systems within
a confederation."

My money is on the Cisco web page you quoted being wrong.

Marko

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   Marko Karppinen