Distribute-list of the routing strategy

1 Application of distribute-list for routing purposes of control

1.configuring distribute-list has two kinds, ws-c2960-48pst-l price one is based on the out direction;one is based on the in direction;

For outbound updates:

Distribute-list {access-list-number | name} out

For inbound updates:

Distribute-list [access-list-number name [route-map map-tag] in | |] [interface-type

Interface-number]

Summary: in distribute-list if you want to influence me "myself" using “in”, influence "others" using “out”.

Supplement: the knowledge about ACL

Requirements: the following IP address to a minimum range of match ofstrategy

199.172.000000100.0/24 4

199.172.000000101.0/24 5

199.172.000000110.0/24 6

199.172.000000111.0/24 7

Question: for the above address how to write ACL? There are anti mask theiris how much is the most appropriate?

Answer: for the above address third eight bit aligned with calculation is only for one or 0

All the above address third eight can be written as: 00000100; converted todecimal 4, anti mask third eight: 00000011 (which is the same for the 0different 1) converted to decimal 3

All in all, written in standard ACL: access-list 1 permit 199.172.4.0 0.0.3.0

Example: 199.172.000000000.0/24 0

199.172.000000001.0/24 1

Low

199.172.000000011.0/24 3

199.172.000010000.0/24 16

199.172.000010001.0/24 17

199.172.000010010.0/24 18

199.172.000010011.0/24 19

In this case the first third eight 00000000 0 third eight, anti mask bit is 000010011 or 19, so in the standard

ACL written:

#access-list 1 permit 199.172.0.0 0.0.19.0

Only in this way can we guarantee the minimum range filtering, of course, the use of distribute-list earlier to do acl.

Advice: try to use the ACL application please named ACL, buy ws-c3750x-48t-s because in the larger network if you write a lot of ACL, not convenient to manage, and named ACL can avoid this defect.

http://hometuitionvideo.com/members/manageBlog.php