rip

[shashank.kumar1]

hi

if in case we have 3 router in that case if we will run this commend on the middle router than how the other router will able to communicate on the either side (how first and second router will communicate to each other ). as  the middle router cant send the update and just can receive the updates.

or 

if in case if two router are connected to each other and on first router interface we ran the passive-interface command then it will not send the routing table and just receive the routing table then this will get the information about the other router but how will the other router will get the routing table to first router  

[Philip D'Ath]

I don't completely understand your question - but you would want to run the same routing protocol, RIP, on all three routers.  Then all the routers will have a consistent view of the network.

A passive interface only listens to updates and does not send them.

[shashank.kumar1]

hi

thanks for the quick reply 

i want to know that if we run the passive interface commend on a router than in that case it will still transfer the routing table after every 30s or not.

if not then if a  new router will be added to this router then how will the other routers geet to know about the new router  

[Philip D'Ath]

When passive is used a router only listens for updates.  It will not send updates.

It sounds like you should not be using the passive option.  You need all the routers to exchange information about all of there interfaces.

[syed kazim abbas · Accepted solution]

Hello Kumar,

we should understand the usage of "Passive-interface" command. If you have an interface that you do not want to participate in RIP routing, but that is attached to a network that you want advertised, you can configure a network command that covers the network to which the interface is attached, and use the passive-interface command to prevent that interface from sending RIP advertisements.

For example: Lan >router 1 > router 2 > router 3

you need to configure rip on all interfaces including the interface which is connected to LAN for sharing the information(routes) between the routers to communicate. But LAN devices don't need rip updates nor sending any information regarding RIP, keep in mind, this network should be necessary to reach other routers to communicate. That's why we need to run RIP on this interface but no need to send routing updates to LAN devices, we use Passive-interface.

Hope it will helpful for you,

Kazim Abbas

[shashank.kumar1]

thanks alot.....

i