bgp auto-summary

From: Connary, Julie Ann (jconnary@xxxxxxxxx)
Date: Mon Oct 02 2000 - 12:42:10 GMT-3

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        Hi all,

        I am trying to understand BGP and auto-summary.Halabi's book on page 34
4
shows how to put
in an aggregate-address to summarize and suppress more specific routes:

router bgp 3
        no synchronization
        network 172.16.1.0 mask 255.255.255.0
        network 172.16.10.0 mask 255.255.255.0
        network 172.16.65.0 mask 255.255.255.192
        network 172.16.220.0 mask 255.255.255.0
        aggregate-address 172.16.0.0 255.255.0.0 summry-only
        neighbor 172.16.1.2 remote-as 3
        neighbor 172.16.20.1 remote-as 1
        neighbor 172.16.20.1 filter-list 10 out
        no auto-summary

ip as-path access-list 10 permit ^$

So I tried this, worked great. Then Halabi says that the same result could
be achieved using auto-summary.
I removed the aggregate-address statement and then issued an "auto-summary"
command.
I cleared the bgp tables, but my neighbor in AS 1 still gets all the
specific subnets vs. a summary route.

Anyone know why?

My OS version is 11.3(11a)

Thanks,

Julie Ann

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