From: Larry Roberts (larryr@xxxxxxxxxxxx)
Date: Mon Aug 05 2002 - 00:44:09 GMT-3
Group,
As a sidenote to this. Is there anyway to modify who the receiving BGP
router thinks is the advertising BGP router for a BGP route? I don't mean
changing the next-hop, that doesn't work. I need to be able to modify the
advertising router without peering to that router? For example:
BGP routing table entry for 150.50.1.0/24, version 0
Paths: (1 available, no best path)
Not advertised to any peer
69 65006
135.6.3.3 (metric 129) from 135.6.4.4 (135.6.4.4) <---- This is what I
what to modify, I what to set it to 135.6.3.3 without peering directly to
that router.
Origin IGP, localpref 100, valid, internal, not synchronized
Thanks,
Larry Roberts
CCIE #7886 (R&S / Security)
----- Original Message -----
From: "Jason Sinclair" <sinclairj@powertel.com.au>
To: "'Dennis Laganiere'" <Dennis@laganiere.net>; <ccielab@groupstudy.com>;
<cisco@groupstudy.com>
Sent: Sunday, August 04, 2002 7:26 PM
Subject: RE: What the heck is BGP Next Hop Propagation?
> 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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