From: benmekki kamal (benmekki_kamal@yahoo.fr)
Date: Sat May 17 2003 - 09:49:36 GMT-3
Hello
By default, BGP does not accept subnets redistributed from Interior Gateway Protocol (IGP). To advertise and carry subnet routes in BGP, use an explicit network command or the no auto-summary command. If you disable auto-summarization and have not entered a network command, you will not advertise network routes for networks with subnet routes unless they contain a summary route.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_r/iprprt2/1rdbgp.htm#1017476
Regards,
Kamal
ccie2be <ccie2be@nyc.rr.com> wrote:
Hi Group,
I have 2 routers - rtr A and rtr B - in the same AS.
rtrA's config
int s0
ip addr 10.6.6.6 255.255.255.0
int e0
ip addr 172.16.1.6 255.255.255.0
router BGP 12
nei 172.16.1.5 remote-as 12
redist connected
Here's the issue: On rtr B, both routes, 10.0.0.0 and 10.6.6.0, are in the
bgp table regardless of whether auto-sum is enabled or disabled. Why is that?
I expected only route 10.0.0.0 to be in rtrB's table when auto-summary is
enabled which is the default.
The same thing happens when rtrA is configured like this:
router bgp 12
nei 172.16.1.5 remote-as 12
net 10.6.6.0 mask 255.255.255.0
From this experiment, it seems that auto-sum doesn't do anything. I assume
I'm doing sonething wrong or I don't quite understand the way auto-summary is
suppose to work. Can somebody set me straight?
Thanks in advanced.
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This archive was generated by hypermail 2.1.4 : Mon Jun 02 2003 - 15:13:44 GMT-3