RE: Permitting odd and even routes??

From: Huizinga, Rene (rhuizinga@upcbroadband.com)
Date: Wed Feb 15 2006 - 20:02:42 GMT-3

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Hi Venkatesh,

Sorry, but I don't believe you're correct. They're asking here to use the
3rd octect as seperator...I read that as the third only, so the correct 2
ACL-entries would then be:

acc 10 perm 218.18.0.0 0.0.254.0 (Even)
acc 10 perm 218.18.1.0 0.0.254.0 (Odd)

Cya

Rene

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Venkatesh Palani
Sent: 15 February 2006 23:57
To: Emil Patel
Cc: ccielab@groupstudy.com
Subject: Re: Permitting odd and even routes??

Hi Emil,

The access-list for even routes is correct, but for the odd routes it is
pretty tricky because when you use 0.0.255.255 you are matching both odd and
even.
so I think we coudl do it two different ways, meanwhile I havent tested them
in the lab so please test them before you use

1. in the above example use 218.18.1.0 0.0.254.255 because the last bit
needs to be 1 always and is not allowed to change

2. use routemap where you want to filter out the even routes thus the
remainning will be odd routes, something liek the one shown below
Route-map odd-routes deny 10
match ip <ACL for the even routes>
Route-map oddroutes permit 20

Could you please check them on ur set up and let me know if it all works :-)

Thank you,
venkatesh

On 2/16/06, Emil Patel <emilpatel@hotmail.com> wrote:
>
> I have following rip routes being learned from the BB routers:
>
>
>
> 218.18.0.0/24
>
> 218.18.1.0/24
>
> 218.18.2.0/24
>
> 218.18.3.0/24
>
>
>
> If I just want allow odd or even numbered routes based on 3rd octet, here
> what I have in my config:
>
>
>
> For odd routes:
>
> Access-list 10 permit 212.18.0.0 0.0.255.255
>
>
>
> For even routes:
>
> Access-list 10 permit 212.18.0.0 0.0.254.255
>
>
>
> Is this correct?
>
>
>
> Emil
>
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