Route filteration based on whether being odd or even network number

[samisalim]

I want to block routes coming from odd number networks from being advertised in my router. Example, I want to permit even routes from 150.100.x.0 where x is 16,18,20,22,24. Thanks

[pkhatri · Accepted solution]

use this:

access-list 1 permit 150.100.0.0 0.0.254.0

Cheers,

Paresh.

[samisalim]

Its proven working, I have tested it in my lab. Thanks a lot.

[ashok_boin]

Hi,

I don't feel that you cann't define any ACL which matches only 16,18,20,22 and 24 with just one ACL wildcard mask except defining each entry explicitly to permit.

There is one more option to permit 16,18,20,22 and 24 given below but it even permits some other even networks too.

access-list 1 permit 157.100.0.0 0.0.14.255

Thank you,

Regards...

-Ashok.