EIGRP With passive

Unanswered Question


WE HAVE DS Switch 4507;I need to advertise 2 network

& Via EIGRP!

Also i have 10 SVIs:

is this a good config on the DS?




passive interface default

no passive inbterface port-channel 4

no auto-summary

core side:


any suggestion:



I have this problem too.
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Amit Singh Tue, 04/03/2007 - 01:34

Hello Ali,

I see that you want to run EIGRP between Core and the DS switches.

How is the connectivity between core switches and DS switches. If the connectivity is using the "port-channel 4" then the config is OK.

If you are using some other interface to connect to the core switch from the DS side, then I am afraid that the config will not work.As you are using "passive interface default " command under the EIGRP configuration, this will prevent EIGRP to form neighbor relationship between the switches other than " port-channel 4".

So just make sure about the interface connecting the switches and configure the passive interfaces accordingly.


-amit singh

ankbhasi Tue, 04/03/2007 - 01:48

Hi Ali,

As you mentioned "you need to advertise 2 network & Via EIGRP" but you are advertising completely and not a network. So EIGRP will be activated only on that interface who has been configured with ip address and not on 172.16.x.x network.

If that is your requirement then you are good to go because on your core also I see you are enabling eigrp for 172.16 network on single interface.

Rest as Amit mentioned about passive interface go ahead and check the dist and core is connected via which interfaces.



Amit Singh Tue, 04/03/2007 - 02:10


You dont have to configure the port-channel interface as passive interface. Dont do that otherwise you will loose the adjacency with the neighbor.The config is fine for network and .1 as you want the EIGRP to be run on these interfaces.The config done so far on DS is absolutely fine.


-amit singh


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