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  1. Hello Chandrasekhar

    The auto-summary command restores the default auto summarization behaviour of the routing protocol. RIP Version 1 always uses automatic summarization. If you are using RIP Version 2, you can turn off automatic summarization by specifying the no auto-summary command. Disable automatic summarization if you must perform routing between disconnected subnets. When automatic summarization is off, subnets are advertised. Note that this is

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  2. Hello… I have a question… and not sure why my routers are working that way… I have a summary address of 3 networks being advertised from R1 to R2… I used the command ip summary-address rip 172.16.0.0 255.255.224.0 to publish that route from R1 to a neighbor router R2…ok I desactivate this summary address with the command no ip summary-address rip 172.16.0.0 255.255.224.0 on router R1, and after a few seconds AGAIN I activate the command ip summary-address rip 172.16.0.0 255.255.224.0 on router R1, the problem is that now the summary address is gone forever… my

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  3. Hello Alvaro

    That’s interesting. Normally, when you reinstate the summary-address command, the summary address should appear in the RIP neighbor. Take a look at this text from a Cisco Document (link below).

    As long as there are child routes for a summary address, the address remains in the routing database. When the last child route is removed, the summary entry also is removed from the database. This method of handling database entries reduces the number of entries in the database because each child route is not listed in an entry, and the aggregate entry

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  4. Hello Alvaro

    Yes Alvaro, that makes sense. Poison reverse will cause R1 not to put the routes in the routing table. However, once you reinstate the summary route, after a certain amount of time, the poison reverse message will have timed out, this is how it should function. During the time that the networks are still “poisoned” can you use show ip protocols and show ip rip database and you can also continue to watch RIP debugs

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  5. Okay… thanks for your time. =)

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