EIGRP AUTO SUMMARY INFO FORM DOC  

Thursday, December 25, 2008

#AUTO SUMMARY EIGRP MODULE 2 IE 4.10 THUR DEC 25 #

AUTO SUMMARY : EIGRP

1. To allow automatic summaraisation of subnet routes into network-level routes, use the auto-summary
command in boundaries in router config mode

2. To disable this function and send subprefix routing information
accross classful network boundaries , use the no form of this
command


USAGE GUIDELINES

1. Route summaraisation reduces the amount of routing info in the
routing tables

2. By default BGP does not accept subnets redistributed from and IGP

3. To allow the software to create summary subprefixes to the classful network boundary ,
use auto-summary command

4. To advertise and carry subnet routes in BGP, use an explicit
network comamnd because automatic summary is disabled by default

5. If you have not enetered a network command, you will not
advertise network routes for networks with subnet routes
unless they contain a summary route

6. EIGRP summary routes are given an AD of 5

7. RIP V1 uses automatic summaraisation . If you are using RIPV2 ,you can turn off auto summary by specifying the no
auto-summ

8. Disable automatic summaraisation if you mutst perform routing
between disconnected subnets. When automatic summaraisatin is
off , subnets are advertised

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