From: Matthew Seppeler (Matt.Seppeler@InetX.com)
Date: Wed Sep 29 2004 - 11:29:28 GMT-3
BGP Conditional Advertisement is the way to go and the Doc CD will help
you through the steps needed to make this work. The following link will
walk you through configuring this feature:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
fipr_c/ipcprt2/1cfbgp.htm#wp1029447
Here is the catch though. Cisco makes a few incorrect statements
regarding the non-exist part of Conditional Advertising.
In the configuration section, the following statement is made: "The
announced route will be originated by BGP only if the corresponding IGP
route exists." It needs to state "..... will be originated by BGP only
if the corresponding route exists in the BGP table."
In the example section, they it also incorrectly states the following:
"The prefix tracked by the BGP speaker must be present in the IP routing
table for the conditional advertisement not to take place." It should
state "The prefix tracked by the BGP speaker must be present in the BGP
table ....."
Make note of this as this feature will not work properly if you do not
make these adjustments. I gave Cisco feedback pertaining to this error.
It has been acknowledged and submitted to the author of this link.
However, it's been a little of 3 weeks with no reply or update. I hope
they update it on the Doc CD before my exam in November.
Matt Seppeler
InterNetwork Experts
Email: mseppeler@inetx.com
-----Original Message-----
From: Tony Schaffran [mailto:groupstudy@cconlinelabs.com]
Sent: Wednesday, September 29, 2004 7:32 AM
To: 'Tasuka Amano Hsu'; 'ccielab Groupstudy'
Subject: RE: BGP default route with condition
Have you heard of BGP conditional advertisement?
It is pretty easy to find on the doc cd.
Tony Schaffran
Network Analyst
CCIE #11071
CCNP, CCNA, CCDA,
NNCDS, NNCSS, CNE, MCSE
www.cconlinelabs.com
Your #1 choice for online Cisco rack rentals.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Tasuka Amano Hsu
Sent: Wednesday, September 29, 2004 3:17 AM
To: ccielab Groupstudy
Subject: BGP default route with condition
Hi,
I have BGP default route problem with this require:
Configure your network so that R8 will have a default route pointing to
R7. You are allowed to configure a default route on R7 but no
configuration is allowed on R8 for this step. This default-route should
only appear in R8's ( the original Workbook is R7's) routing table when
R7 is able to reach the 140.10.76.0 subnet. Is this possible ?
I am use the simple command under to let the R7 send out the default
route to R8.
neighbor 100.0.0.8 default-originate
but how to remove the default route when R7 can not reach the
140.10.76.0 subnet ?
the solution in that book use route-map like:
neighbor 100.0.0.8 default-originate route-map DEF
route-map DEF permit 10
match ip address 1
route-map DEF permit 20
access-list 1 permit 140.10.76.0 0.0.0.255
Is this correct ? I can not get any sense for this.
As I know the standard access-list is for packet source address match,
so that just match if the packet come from 140.10.76.0 subnet then
route-map match it. Right ?
Sincerely,
Tasuka
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