From: abdul_rahim@xxxxxxxxxxxxxx
Date: Fri Sep 29 2000 - 18:36:39 GMT-3
Whats a prefix-list and how can it be used in this scenario
Any feedback would be highly appreciated
Thanks
abdul
"Mark Lewis" <markl11@hotmail.com>@groupstudy.com on 09/29/2000 08:47:05 AM
Please respond to "Mark Lewis" <markl11@hotmail.com>
Sent by: nobody@groupstudy.com
To: ccielab@groupstudy.com
cc:
Subject: RE: question on extended access-lists for BG P route filtering
Yup, and you can use a prefix-list to do the same thing...
Mark
>From: smaljure@cibernetworks.com
>Reply-To: smaljure@cibernetworks.com
>To: jconnary@cisco.com, ccielab@groupstudy.com
>Subject: RE: question on extended access-lists for BG P route filtering
>Date: Fri, 29 Sep 2000 11:26:36 -0400
>
>Hi
>The extended access-list normally has the interpretation of <<the
>destination network or host>>
>Within the context of BGP, we can use the extended access-list to specify
>the mask associated with the network to be filtered or controlled.
>I do not know where it came from though. It works
>Sanjay
>
>-----Original Message-----
>From: Connary, Julie Ann [mailto:jconnary@cisco.com]
>Sent: Friday, September 29, 2000 10:46 AM
>To: ccielab@groupstudy.com
>Subject: question on extended access-lists for BG P route filtering
>
>
>Hi All,
>
>In Halabi's Internet routing Architecture book he has the following
example
>that confuses me (page 310):
>
>If you want to filter 172.16.0.0/16 such that only 172.16.0.0/16 and not
>172.16.0.0/17, 172.16.0.0/18 ... are
>also permitted you must use and extended access-list. Thus the standard
>access-list of will not work:
>
>access-list 1 permit 172.16.0.0 0.0.255.255
>
>
>He then goes on to defined an extended access list as:
>
>access-list access-list-number permit ip network-number
>network-do-no-care-bits mask mask-do-not-care-bit.
>
>And gives the following example:
>
>access-list 101 permit ip 172.16.0.0 0.0.255.255 255.255.0.0 0.0.0.0
>
>
>My question is, where did he get that definition of an extended
access-list
>that says the second
>set of address/mask pairs is a mask/mask-wildcards pair? Is this specific
>to how BGP will
>use the extended-access list vs. using the access-list in say an ACL? I
>always understood the second pair
>was the destination network or host.
>
>Julie Ann
>
>
>
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:25:09 GMT-3