From: Lachlan_Kidd@xxxxxxxxxxxx
Date: Wed Sep 06 2000 - 21:55:50 GMT-3
Hi Ola,
I would suggest that you need a next-hop-self on rtB. This will make
the source of the 1.1.1.0 update appear to be rtrB for C and D. I think the
problem lies in the reachability of the update coming from rtrA. Rember
that with IBGP, the source of the update does not change so C and D will be
seeing the update as coming from RtrA's serial port. C and D may not have a
route to that network and hence the old rule of 'do not advertise what you
do not know how to reach' applies. No synch only helps with IBGP. You could
try advertising the A-B network with an IGP and see if that fixes the
problem.
I may have this completely wrong so feel free to correct me <grin>.
Regards,
Lachlan.
"Ola
Aiyegbusi" To: <ccielab@groupstudy.com>
<ola@compath. cc:
com> Subject: IBGP, EBGP, AND ROUTE REF
LECTORS
Sent by:
nobody@groups
tudy.com
05/09/00
05:06 PM
Please
respond to
"Ola
Aiyegbusi"
I have a problem.
I can't ping an external bgp router (AS100) from another AS (AS200) that
has a route reflector configured with no sync configured on all ibgp
speakers in the AS (AS200)
a) rtr A (AS100) and rtr B (AS200) are external neighbors connected via
serial. They can ping each other.
b) rtr A is advertising it's loopback address via BGP (1.1.1.1/24)
c) rtr B can ping rtr A's loopback address
d) In AS200, rtr B is connected to rtr C. rtr C is connected to rtr D e.g.
(rtrB)--------(rtrC)--------(rtrD)
e) All 3 routers above are in AS 200. rtr B is neighbored with rtrA
(external) and rtrC (internal). rtrC is neighbored with B and D (both
internal. rtr D is neighbored with C (internal)
f) In AS200, rtr C is configured as the route reflector with B and D as
clients
g) The IGP running in AS 200 is OSPF
h) Synchronization has been disabled in all AS 200 IBGP speakers
g) Network 1.0.0.0 (see bullet b above) shows up in the bgp table and
routing table of all IBGP speakers in AS 200
Problem is: I can't ping 1.1.1.1 from rtr C or D, but I can ping it from
rtr B. HELP!!!!!!!
Ola Aiyegbusi
ComPath Inc.
10201 Lee Hwy Suite 140 Fairfax VA 22030
Phone: 703-383-9550 Ext. 122
Pager: 1-888-857-5620
Cell: 703-395-8808
Fax: 703-383-1369
Email: ola@compath.com
Web: http://www.compath.com
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