BGP auto- summary not working as expected

From: ccie2be (ccie2be@nyc.rr.com)
Date: Fri May 16 2003 - 16:56:36 GMT-3


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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