From: Boehmler, John (jboehmler@cisco.com)
Date: Tue Jan 07 2003 - 13:56:40 GMT-3
At 04:01 PM 1/7/2003 +0000, Matthew Poole wrote:
>Hi All
>
>1. Am I right in saying next-hop-self only needs to be used within an AS??
It depends. The primary consideration is ibgp vs. ebgp. Next is media
type. With ibgp, next hop self is critical if the other ibgp routers in
the AS do not have a route to the ebgp neighbor advertising the
route. With ebgp, the next hop self is important when dealing with an NBMA
media if all the ebgp peers on it are not fully meshed. In such a case,
the ebgp neighbor will set the next hop as the other ebgp peer on the NBMA
network. If all neighbors cannot reach each other, this will cause a
problem and justifies a next-hop-self.
http://www.cisco.com/en/US/tech/tk648/tk365/technologies_q_and_a_item09186a00800949e8.shtml#11
http://www.cisco.com/warp/public/459/bgp-toc.html#bgpnexthop
>2. If the requirements state that all interfaces must be reached by a ping,
>then is the best way to inject the WAN links into BGP by network statements?
>
>Thanks,
>
>Mat.
>.
John Boehmler
Cisco Systems
System Engineer - Delaware Valley Named
301 Lindenwood Dr., Suite 210
Malvern, PA 19355
Cell: 610.348.8774
Phone: 610.695.2943
Fax: 610.768.0708
mailto: jboehmler@cisco.com
http: www.cisco.com
.
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