Check out this excellent post from Brian McGahan.
http://www.groupstudy.com/archives/ccielab/200303/msg01685.html
-----Original Message-----
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
Edward Agostinho
Sent: Sunday, November 23, 2003 9:58 AM
To: ccielab@xxxxxxxxxxxxxx
Subject: Summarizing Access-lists
Hi group
How do we summarize access-lists with different subnet masks.
Let's assume you are requested to summarize the following in the least
amount
of lines:
access-list 10 permit 133.6.11.0 0.0.0.127
access-list 10 permit 135.16.171.0 0.0.0.255
access-list 10 permit 172.60.51.0 0.0.0.127
access-list 10 permit 121.15.120.0 0.0.0.31
access-list 10 permit 112.59.9.0 0.0.0.255
Do I attempt to summarize:
access-list 10 permit 133.6.11.0 0.0.0.127
access-list 10 permit 172.60.51.0 0.0.0.127
and
access-list 10 permit 135.16.171.0 0.0.0.255
access-list 10 permit 112.59.9.0 0.0.0.255
and leave
access-list 10 permit 121.15.120.0 0.0.0.31
or do I ignore the masks and do a normal AND and XOR with the network
portion
of the addresses?
I know how to summarize them if they all use /24 as the examples given
by the
rest of the group but never seen one with different subnet masks?
Thanks
Edward
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