From: Brian Dennis (brian@labforge.com)
Date: Sun Jun 29 2003 - 17:34:23 GMT-3
Actually can you send the whole config from each router relating to BGP
and the output from "sho ip bgp | in 1[5-7]0.100.0.0" on R7? I'm looking
at your network statements and they don't look correct and I'm really
not sure how the R7 is seeing any of these routes.
Incorrect statements:
network 150.100.0.7 mask 255.255.255.0
^
network 160.100.0.7 mask 255.255.255.0
^
network 170.100.0.7 mask 255.255.255.0
^
BGP will only auto summarize routes redistributed into BGP and not
routes that are generated via the network statement unless of course you
put in the classful network to begin with.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Brian Dennis
Sent: Sunday, June 29, 2003 1:47 AM
To: 'Yunjie Chen'; 'CCIE Group'
Subject: RE: BGP question
BGP is auto summarizing the networks to their classful boundaries.
Auto summarization for BGP is enabled by default for IOS versions
12.2(7)T and below. After 12.2(8)T synchronization and auto
summarization are disabled by default.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Yunjie Chen
Sent: Saturday, June 28, 2003 11:52 PM
To: CCIE Group
Subject: BGP question
Hi,
a quick question for BGP....
R7 and R4 are directly connected and running BGP in between...
R7 has three loopback interfaces who are 150.100.0.7/24, 160.100.0.7/24,
170.100.0.7/24
In order to let R4 see these routes...under R7's bgp configuration i put
network 150.100.0.7 mask 255.255.255.0
network 160.100.0.7 mask 255.255.255.0
network 170.100.0.7 mask 255.255.255.0
But when i do show ip bgp route at R4, these three routes are showing
r4#sho ip route bgp
B 170.100.0.0/16 [20/0] via 172.17.59.238, 00:00:17
172.17.0.0/16 is variably subnetted, 9 subnets, 5 masks
B 172.17.0.0/16 [20/0] via 172.17.59.238, 00:00:17
B 160.100.0.0/16 [20/0] via 172.17.59.238, 00:00:17
B 150.100.0.0/16 [20/0] via 172.17.59.238, 00:00:17
Why these three routes's mask change from /24 to /16? Both R7 and R4 has
ip subnet zero configured...
Thanks a lot!
Yunjie
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