From: Kurt E. Radecki (kradecki@xxxxxxxxx)
Date: Thu May 03 2001 - 15:10:37 GMT-3
Mark,
Pay attention to the types of routes. Routes learned from an EBGP neigh
bor
are automatically added to the routing table, with or without a no synch,
whereas IBGP-learned routes are not. So, configuring no synch isn't
necessary in some situations. No synch allows IBGP-learned routes to be
added to the routing table, but they won't be unless there's next-hop
reachability.
But, don't take my word for it. Try it yourself.
Kurt
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
mcaplan.cs@clearstream.com
Sent: Thursday, May 03, 2001 1:39 PM
To: ccielab@groupstudy.com
Subject: BGP and no-sync
Hi,
I have a question regarding the effects of no-sync on BGP.
The rule for synch, as far as I know is that an IBGP peer will not advertise
a BGP route to another peer (IBGP or EBGP) if that route does not exist in
the IGP.
>From my observations, a corollary to that is that a BGP peer will not
install learnt BGP routes into the routing table if sync is turned on
(assuming no redistribution). This is shown by comparing 'sh ip bgp' with
'sh ip route'; if sync is on, then routes will be visible in the BGP routing
table, but will not be in the IP routing table. To get these BGP routes into
the IP routing table, one has to simply do a 'no sync'.
I'm just thinking aloud here, but I would appreciate some confirmation of my
logic.
Thanks
Mark
Visit us at http://www.clearstream.com
Check out current job vacancies at
http://www.clearstream.com/public/english/e_vacs.htm
IMPORTANT MESSAGE
Internet communications are not secure and therefore Clearstream
International does not
accept legal responsibility for the contents of this message.
The information contained in this e-mail is confidential and may be legally
privileged. It is
intended solely for the addressee. If you are not the intended recipient,
any disclosure,
copying, distribution or any action taken or omitted to be taken in reliance
on it, is
prohibited and may be unlawful. Any views expressed in this e-mail are those
of the
individual sender, except where the sender specifically states them to be
the views of
Clearstream International or of any of its affiliates or subsidiaries.
END OF DISCLAIMER
**Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:30:33 GMT-3