Re: Suggestion on BGP Prefix-list

From: Ram Shummoogum (rshummoo@ca.ibm.com)
Date: Thu Jun 05 2003 - 17:50:57 GMT-3

Well you get at leat the same. /22,/23 are not necessary.

Cristian Henry H <chenry@reuna.cl>@groupstudy.com on 06/05/2003 03:03:27 PM

Please respond to Cristian Henry H <chenry@reuna.cl>

Sent by: nobody@groupstudy.com

To: "Carter, Lee" <Lee.Carter@CommerceBank.com>
cc: Ram Shummoogum/Quebec/IBM@IBMCA, johnson_liu@corp.giga.net.tw,
       ccielab@groupstudy.com
Subject: Re: Suggestion on BGP Prefix-list

Do you get the same results with the following prefix list?

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

"Carter, Lee" ha escrito:
>
> Correct me if I'm wrong but the
>
> prefix-list XXX seq 5 permit 192.168.0.0/21 ge 24 le 24
>
> will allow 192.168.0.0/24 thru 192.168.7.0/24
>
> The question stated earlier sais to allow only 192.168.1.0/24,
> 192.168.2.0/24 and 192.168.5.0/24
>
> -----Original Message-----
> From: Ram Shummoogum [mailto:rshummoo@ca.ibm.com]
> Sent: Thursday, June 05, 2003 9:44 AM
> To: johnson_liu@corp.giga.net.tw
> Cc: ccielab@groupstudy.com
> Subject: RE: Suggestion on BGP Prefix-list
>
> I guess you win..
> Thanks
>
> $BN-Gn?N(J <johnson_liu@corp.giga.net.tw> on 06/05/2003 10:33:56 AM
>
> To: Ram Shummoogum/Quebec/IBM@IBMCA, <scotsman@rediffmail.com>
> cc: <ccielab@groupstudy.com>
> Subject: RE: Suggestion on BGP Prefix-list
>
> How about this :
>
> prefix-list XXX seq 5 permit 192.168.0.0/21 ge 24 le 24
>
> --
> Johnson Liu
> Senior Network Engineer
> Gigamedia Limited, Inc.
> CCNP/CCDP/CCIE#11440
>
> -----Original Message-----
> From: Ram Shummoogum [mailto:rshummoo@ca.ibm.com]
> Sent: 2003/6/5 [$B@14|;M(J] $B2<8a(J 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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--
Cristian E. Henry
REUNA

E-mail: chenry@reuna.cl
Fono: 56-2-3370336

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