10-27-2009 02:28 AM - edited 03-04-2019 06:30 AM
hello,
i have matched some bgp routes with prefix-list and set local higher local pref for some destination prefixes but same i am getting output when i am matching same routes with standard access-list then why should i use confusing or complex prefix-list? what the exact use of it? and when?
thanks and regards,
sourabh
Solved! Go to Solution.
10-27-2009 03:49 AM
Lets take an example :
You need to permit 150.5.x.x network an only which has a default class B subnet mask and allow on the routes which have grtaer than 28 bit mask.
ip prefix-list abc permit 150.50.0.0/16 ge 28
With prefix-list above only the masks which are greater than 28 will be selected.
You wont be able to match it with an ACL.
10-27-2009 02:35 AM
Prefix-list with BGP is used for more granular filtering of the routes.
With ACL's you can only match the networks, while with prefix-list you can match on both network + mask.
HTH,
-amit singh
10-27-2009 02:48 AM
hello Mr.Amit,
But for mask we can use wildcard mask with standard or extended access-list to match the mask of network, am i right? pls suggest.
Thanks and regards
sourabh
10-27-2009 03:49 AM
Lets take an example :
You need to permit 150.5.x.x network an only which has a default class B subnet mask and allow on the routes which have grtaer than 28 bit mask.
ip prefix-list abc permit 150.50.0.0/16 ge 28
With prefix-list above only the masks which are greater than 28 will be selected.
You wont be able to match it with an ACL.
10-27-2009 03:54 AM
thanks a lot for providing very simple example for me..
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