From: Jason Sinclair (sinclairj@xxxxxxxxxxxxxxx)
Date: Sun Aug 04 2002 - 23:26:18 GMT-3
Dennis,
This link explains it:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120
limit/120st/120st16/st_bgpnh.htm
This feature allows you to modify the next-hop attribute when configuring
route-reflectors and also allows you to send next-hop info to eBGP peers
that is not modified as per the normal rules of next hop changes when
sending an advertisement to an eBGP neighbour. To sum it up the rules of BGP
state that if a route is learned via iBGP then next hop info does not change
and we can use the bgp next-hop self statement to modify this. With eBGP
peers, the next hop info is modified at each eBGP router (in each AS) so
that the next hop appears as the advertising router. To modify this you can
use the info in the attached link.
Please let me know if this clarifies this, or if you would like further
explanation.
Regards,
Jason Sinclair CCIE #9100
Manager, Network Control Centre
POWERTEL
55 Clarence Street,
SYDNEY NSW 2000
AUSTRALIA
office: + 61 2 8264 3820
mobile: + 61 416 105 858
email: sinclairj@powertel.com.au
-----Original Message-----
From: Dennis Laganiere [mailto:Dennis@laganiere.net]
Sent: Tuesday, 6 August 2002 09:27
To: ccielab@groupstudy.com; cisco@groupstudy.com
Subject: What the heck is BGP Next Hop Propagation?
In a semi-random CCO search I came across "BGP Next Hop Propagation", but
reading over the few links I've found isn't enough for me to figure it out.
I've looked through several BGP books and found nothing. I also tried an
archive search without results. Anybody seen this before? (I've got to
find
a new hobby... :-)
--- Dennis
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