From: Hugh Johnston (hughlj@xxxxxxxxxxx)
Date: Mon Oct 29 2001 - 12:17:10 GMT-3
The implicit deny at the end. The 24th bit is matched and the odd class B's
will not match any of these statements and fall thru to the implicict deny
any any. I believe.
this should do it.
access-list 1 deny 158.168.94.0 0.0.0.0
access-list 1 permit 158.168.0.0 0.0.63.255
access-list 1 permit 158.168.64.0 0.0.31.255
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Albert Lu
Sent: Monday, October 29, 2001 6:46 PM
To: 'Brian Hescock'
Cc: 'Cliff Ward'; ccielab@groupstudy.com; 'Andy Cuberly'
Subject: RE: Redistributing only even subnets.
But how would you deny the odd addresses?
-----Original Message-----
From: Brian Hescock [mailto:bhescock@cisco.com]
Sent: Tuesday, October 30, 2001 1:46 PM
To: albert_ccie@yahoo.com
Cc: 'Cliff Ward'; ccielab@groupstudy.com; 'Andy Cuberly'
Subject: Re: Redistributing only even subnets.
Yep, 5 lines, get rid of the deny statement at the end :-)
Albert Lu wrote:
>You mean:
>
>access-list 1 permit 158.168.0.0 0.0.63.255
>access-list 1 permit 158.168.64.0 0.0.15.255
>access-list 1 permit 158.168.80.0 0.0.7.255
>access-list 1 permit 158.168.88.0 0.0.3.255
>access-list 1 permit 158.168.92.0 0.0.0.0
>access-list 1 deny 158.168.1.0 0.0.254.255
>
>Hmm... 6 lines. Anyone knows a shorter way?
>
>Albert
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Brian Hescock
>Sent: Tuesday, October 30, 2001 1:02 PM
>To: Andy Cuberly
>Cc: 'Cliff Ward'; ccielab@groupstudy.com
>Subject: Re: Redistributing only even subnets.
>
>
>These are the kinds of things everyone needs to watch out for, easy
>points missed. Because the requirement said even networks up through
>92.0, not 254.0. So what you really need is five line:
>
>even networks been 0-63, 64-79, 80-87, 88-91, and 92
>
>Brian
>
>
>
>Andy Cuberly wrote:
>
>>An access list with the following commands would filter out ALL odd
>>networks.
>>
>>Access-list 1 deny 158.168.1.0 0.0.254.255
>>Access-list 1 permit any
>>
>>Andy
>>
>>-----Original Message-----
>>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>>Cliff Ward
>>Sent: Monday, October 29, 2001 4:40 PM
>>To: ccielab@groupstudy.com
>>Subject: Redistributing only even subnets.
>>
>>
>>An interesting issue has arisen.
>>
>>I'm running OSPF to EIGRP redistribution and want to advertise a group of
>>class B subnets. 158.168.1.0 through 158.168.92.0. However odd number
>>subnets
>>need not be advertised. EG. Advertise 158.168.2.0 and 158.168.4.0
>>
>through...
>
>>but not 158.168.3.0 or 158.168.5.0 etc, etc.
>>
>>I've been playing with a series of access lists and route maps but is
there
>>an
>>easy way to do it with minimal commands? It seems to me that the last bit
>>
>in
>
>>the third octet is the discriminator between odd and even but I can't seem
>>to
>>get this to translate to an access-list which works with redistribution.
>>
>>Thanks,
>>Cliff.
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