RE: Suggestion on BGP Prefix-list

From: Ram Shummoogum (rshummoo@ca.ibm.com)
Date: Thu Jun 05 2003 - 11:44:25 GMT-3

I guess you win..
Thanks

$BN-Gn?N(B <johnson_liu@corp.giga.net.tw> on 06/05/2003 10:33:56 AM

To: Ram Shummoogum/Quebec/IBM@IBMCA, <scotsman@rediffmail.com>
cc: <ccielab@groupstudy.com>
Subject: RE: Suggestion on BGP Prefix-list

How about this :

prefix-list XXX seq 5 permit 192.168.0.0/21 ge 24 le 24 

--
Johnson Liu
Senior Network Engineer
Gigamedia Limited, Inc.
CCNP/CCDP/CCIE#11440

      -----Original Message-----
      From: Ram Shummoogum [mailto:rshummoo@ca.ibm.com]
      Sent: 2003/6/5 [$B@14|;M(B] $B2<8a(B 08:01
      To: scotsman@rediffmail.com
      Cc: ccielab@groupstudy.com
      Subject: Re: Suggestion on BGP Prefix-list

      Let me give it a shot.

      prefix-list XXX seq 5 deny 192.168.20.0/23 ge 24 le 24
      prefix-list XXX seq 10 permit 0.0.0.0/0 le 32

      RAM

      "Scot Peter" <scotsman@rediffmail.com>@groupstudy.com on 06/05/2003
      06:35:14 AM

      Please respond to "Scot  Peter" <scotsman@rediffmail.com>

      Sent by:    nobody@groupstudy.com

      To:    ccielab@groupstudy.com
      cc:
      Subject:    Suggestion on BGP Prefix-list

      Hello Group,

      I have a scenario like this

      AS254--(EBGP)----R4(AS1)---(IBGP)---R2(AS1)

      AS 254 is advertising five routes to R4 in the range...
      192.168.1.0/24
      192.168.2.0/24
      192.168.5.0/24
      192.168.20.0/24
      192.168.21.0/24
      The requirement is to allow only 192.168.1.0/24, 192.168.2.0/24
      and 192.168.5.0/24 ONLY; and filter all other routes. DO NOT use
      any access-lists / distribute lists; use only prefix lists with
      minimum number of lines.

      I have configured the below on R4; but not sure on configuring
      minimum number of lines. Please advice.

      Router bgp 1
      neighbor 10.1.1.1 remot-as 254
      neighbor 10.1.1.1 prefix-list XXX in

      prefix-list XXX seq 5 permit 192.168.1.0/24
      prefix-list XXX seq 10 permit 192.168.2.0/24
      prefix-list XXX seq 15 permit 192.168.5.0/24

      Is this config is OK with the minimum number of lines?

      Thanks in advance
      SP

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