About lan to lan

[pecom]

I wanna link two diferent buildings across 5xE1 (10Mbps). Can I configure my routers to run lan to lan configuration in order to have the same addressing in both buildings ?

Thanks in advance.

[tahequivoice]

Can you clarify on this? From what I gather from this, you want to use 5 10meg ethernet ports to connect two buildings together and run both buildings on the same ip subnet.

If this is the case, you wont need routers, but 5 ethernet ports wont really work either if you are thinking it will give you 50 megs of bandwidth. You can take a 100meg port between two switchs and link them together provided the total length of the run is under 400', in that case you can have all the devices on the same subnet in both buildings and connect the one building to a router if you are using it for Internet. If it is over 400' then you can use a Fiber connection to connect them together. Anther way to do it is if you have several subnets between the buildings, create a trunk port between both buildings and bring vlans across it, then a DOT1q trunk to the router and terminate the vlans to subinterfaces on the router to route between the subnets.

[Tony.henry]

Pecom,

You can certainly bridge your ethernet traffic across the E1, but it's not going to be nice.

Simply assinging the five serial interfaces and the ethernet interface to same bridge group will not get the desired result. Four of the E1 interfaces will go into blocking mode.

You could have a look at Inverse muxing equipment. (IMA) that may work but you'd have to spend some time looking into it to make sure you get the desired result.

An IGP like EIGRP would be able to do load sharing over the 5 links easily and would be able converge around any failures easily.

I think in the end you may need to evaluate the reason that you want the same addressing at both sites.

Tony