Re: BGP aggregate address and suppress access list

From: Joe Higgins (netsat@xxxxxxxxxxxxx)
Date: Sun Feb 10 2002 - 18:29:37 GMT-3

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trey this
Standard IP access list EVEN
permit 3.0.0.0 0.255.255.255
permit 2.1.1.0 0.254.254.255

or
deny 2.0.0.0 0.254.254.255
permit any

Rob Rummel wrote:

> While doing a BGP lab I tried to do the following.
> Advertise a aggregate address of 2.0.0.0/8 and allow address that have a
> odd number in the second and third octet to be advertised.
> I made a access list but as you see by the results below the access list
> statement permit 2.0.0.0 0.254.255.255 log seems to be matching
> everything
> With odd or even number in the third octet.
> How does 2.0.0.0 0.254.255.255 = 2.2.27.0
> I'm missing something here.
>
> !
> router bgp 2
> bgp log-neighbor-changes
> network 2.2.2.0 mask 255.255.255.0
> network 2.2.22.0 mask 255.255.255.0
> network 2.2.23.2 mask 255.255.255.0
> network 2.2.24.0 mask 255.255.255.0
> network 2.2.27.0 mask 255.255.255.0
> network 2.22.2.0 mask 255.255.255.0
> network 2.22.22.0 mask 255.255.255.0
> network 2.23.2.0 mask 255.255.255.0
> network 2.27.2.0 mask 255.255.255.0
> network 22.2.2.0 mask 255.255.255.0
> aggregate-address 2.0.0.0 255.0.0.0 suppress-map EVEN
> neighbor 10.3.2.3 remote-as 3
> neighbor 200.2.8.8 remote-as 8
> neighbor 200.7.2.4 remote-as 145
> neighbor 200.7.2.7 remote-as 76
>
> !
> ip access-list standard EVEN
> permit 2.0.0.0 0.254.255.255 log
> permit 2.2.0.0 0.0.254.255 log
> route-map EVEN permit 10
> match ip address EVEN
>
> *> 2.0.0.0 0.0.0.0 32768 i
> s> 2.2.2.0/24 0.0.0.0 0 32768 i
> s> 2.2.22.0/24 0.0.0.0 0 32768 i
> s> 2.2.24.0/24 0.0.0.0 0 32768 i
> s> 2.2.27.0/24 0.0.0.0 0 32768 i
> s> 2.22.2.0/24 0.0.0.0 0 32768 i
> s> 2.22.22.0/24 0.0.0.0 0 32768 i
> *> 2.23.2.0/24 0.0.0.0 0 32768 i
> *> 2.27.2.0/24 0.0.0.0 0 32768 i
> *> 3.3.3.0/24 10.3.2.3 0 0 3 i
>
> R2#sh ip access-lists
> Standard IP access list EVEN
> permit 2.0.0.0, wildcard bits 0.254.255.255 log (6 matches) check=2
> permit 2.2.0.0, wildcard bits 0.0.254.255 log check=2
>
> Rob Rummel
>
>
>
> -The faulty interface lies between the chair and the keyboard-
>
> [GroupStudy.com removed an attachment of type image/gif which had a name of i
mage001.gif]

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