Eigrp

Mikdilly

If you had a router with a serial interface configured as 10.82.113.33 /27 and an ethernet port configured as 10.25.67.65 /27. Should you enter the network command for eigrp for each of these subnets as:

network 10.82.113.0 0.0.0.31
network 10.25.67.0 0.0.0.31

Or should you just use:

network 10.0.0.0

Little confused as to when to use the wildcard mask and when not to.

networker050184

You are not entering the subnet to be advertised in the network command. You are telling the router which interfaces to run eigrp on. So you can use any mask that includes that interfaces ip address. You could just as easy use 10.82.113.33 0.0.0.0 (which is my prefered method).

nice343

you use the

network 10.0.0.0

command when eigrp is the only thing running on the router. When you have Ripv2 running on the router. That might be a problem when you have to redistribute unless you configure

passive interfaces

If you want Eigrp to advertise a particular subnet then you include the wildcard mask.

The correct command for those networks and their wildcard masks are

network 10.25.67.64 0.0.0.31
network 10.25.113.32 0.0.0.31

This enables Eigrp for that interfaces and tells the interfaces to only advertise those subnets specified specific subnet.

networker050184

No matter the mask you use in the network statement it will still advertise the subnet from the interface. If you use 10.25.67.64 0.0.0.31 and the mask on the interface is 255.255.255.0 it will advertise that and not 255.255.255.224. Remeber you are telling it what interface to run eigrp on not what network to advertise. (assuming auto-summary is off and not advertising at the classfull boundry in which case it woulds advertise 10.0.0.0)

Mikdilly

Thanks for your help

mikej412

networker050184 wrote:

Remeber you are telling it what interface to run eigrp on not what network to advertise. (assuming auto-summary is off and not advertising at the classfull boundry in which case it woulds advertise 10.0.0.0)

I used the pumpkin since there isn't a gold star emoticon.

This is one of those things a lot of people overlook when studying for the CCNA (and then again studying for the CCNP, but that's just to scary to think about).

mgeorge

mikej412 wrote:

I used the pumpkin since there isn't a gold star emoticon.

lol!!! Johan needs to add a gold star then so that way mike can be a star

r_durant

mgeorge27 wrote:

mikej412 wrote:

I used the pumpkin since there isn't a gold star emoticon.

lol!!! Johan needs to add a gold star then so that way mike can be a star

I think then we'd need more space for Mike and Derek's profiles...all those certs and stars wont survive....