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RIPV2 Questions

Unanswered Question
Sep 25th, 2008
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guys i have two questions about few config if someone can help me out......

if my interface is connected to another router interface (say a f ethernet) and ip address of that is now if i want to disable summarization on interface the command is no auto summary

now if i put passive interface default (what does that do) secondly there is a neigbour command in ripv2? what does that do if i type neibour (which is ip of my connected otehr router interface) what will that do.....guys i m v new to rip your help is needed...thanks

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Overall Rating: 5 (2 ratings)
satish_zanjurne Thu, 09/25/2008 - 05:23
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1. passive-interface default

This will set all interfaces as passive by default.In RIP , passive interface means no routing updates will be sent on this interface.Then if you don't want a interface as passive , you need to go under that interface and use "no passive-interface"


This command permits the point-to-point (nonbroadcast) exchange of routing information. When it is

used in combination with the passive-interface router configuration command, routing information can

be exchanged between a subset of routers and access servers on a LAN.

Multiple neighbor commands can be used to specify additional neighbors or peers.

It is of more use in LAN. Where , you have defined your only LAN interface of router as passive , but you want to update routing information to a router, which lies on same ethernet segment.

So even if you have defined fastethernet as passive , you will still be able to exchange routing information with

It is like making an exception for selected router in a subset of routers..

HTH..rate if helpful..

Giuseppe Larosa Thu, 09/25/2008 - 05:52
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Hello Satish and Khan,


the no passive interface has to be given under router rip as the passive interface default

also the no auto-summary command is given in router rip context



combined with passive interface instructs the router to send out its update as a unicast to the configured ip address(es) instead of using the destination (RIPv2 multicast address).

Because RIPv2 misses a neighbor state machine two devices can exchange updates one sending unicast packets and the other multicast packets.

Hope to help


satish_zanjurne Thu, 09/25/2008 - 06:52
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hi Giuseppe ,

Myself was wrong in first point & you were precise in second point.

Thanks You..


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