GroupStudy.com GroupStudy.com - A virtual community of network engineers
 Home  BookStore  StudyNotes  Links  Archives  StudyRooms  HelpWanted  Discounts  Login
RE: Summarizing Access-lists posted 11/23/2003
[Chronological Index] [Thread Index] [Top] [Date Prev][Date Next] [Thread Prev][Thread Next]


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

_______________________________________________________________________
Please help support GroupStudy by purchasing your study materials from:
http://shop.groupstudy.com

Subscription information may be found at: 
http://www.groupstudy.com/list/CCIELab.html