From: Bob Sinclair (bsin@cox.net)
Date: Sat Apr 23 2005 - 22:10:22 GMT-3
Hi Dennis,
You are entirely correct in your understanding of how the BGP advertise-map
operates. The first route-map matches on the prefix(s) to advertise,
conditional on the existence of routes matching the second route-map. In the
update to V6 we changed the target network from 7.7.7.0 to 6.6.6.0 (to match
the originating router number), and this is reflected in the SHOWiT
configuration and tables. However, the task and AK still need to be updated.
Will do asap! Thanks for pointing this out. Sorry if any misunderstanding.
Bob Sinclair
CCIE #10427, CCSI 30427, CISSP
www.netmasterclass.net
----- Original Message -----
From: Dennis J. Hartmann
To: ccielab@groupstudy.com
Sent: Friday, April 22, 2005 6:11 PM
Subject: NMC #2 -> BGP advertise-map
I'm going through the NMC scenario #2. The scenario is like this....
we
only want to advertise the 7.7.7.0 network from an external AS to another
external AS if the router of 5.5.5.0 is lost.
I'm 99% sure that the configuration below is a mistake because the
network that we'll advertise is 6.6.6.0, not the 7.7.7.0 the scenario calls
for. Please let me know if I'm missing something here.
router bgp 100
no synchronization
bgp log-neighbor-changes
neighbor 172.16.34.4 remote-as 400
neighbor 172.16.34.4 advertise-map Advertise-if non-exist-map
If-not-present
access-list 17 remark ------ If-not-present ---------------------
access-list 17 permit 5.5.5.0 0.0.0.255
access-list 18 remark ------ Advertise-if -----------------------
access-list 18 permit 6.6.6.0 0.0.0.255
access-list 18 remark -------------------------------------------
route-map If-not-present permit 10
match ip address 17
route-map Advertise-if permit 10
match ip address 18
Sincerely,
Dennis J. Hartmann
White Pine Communications
CCSI#23402/CCIP/CCNP/CCDP/CCNA/CCDA
Cisco IP Voice Support & Design Specialist
Cisco Optical, VPN & IDS Specialist
MCSE
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