ME3400 problem to forward layer2 between the interfaces

[Braian Jacomelli]

Hello,

I'm having a problem with a ME3400 switch. When the interfaces are configured to work as a switch, the layer 2 traffic is not forwarded between the switch. I tried to put two devices on the same net (10.0.0.1/24 and 10.0.0.2/24) and send ping packets from the 10.0.0.2 to 10.0.0.1, but the ICMP packets aren't received.

If I configure two interfaces with diferent IP adresses (10.0.0.1/24 and 10.2.2.1/24) and enable de "ip routing", the switch can route the packets without no problem.

I already tried to reset the switch to default factory config, upgrade and downgrade the IOS, but the problem is the same.

Does someone know how to resolve this problem?

[John Blakley]

The only thing that I can think of is, when in L2, are the two devices on the same vlan? If they're in separate vlans, you won't be able to ping between them. Make sure that both ports are configured for the same vlan, disable routing, and then you should be able to ping between as long as they're in the same subnet.

HTH,

John

[acampbell · Accepted solution]

Hi.

By default all fast ethernet ports on ME3400
are in Vlan 1 but they are all of a type UNI

This means they are all isolated from each other (like private vlans)

If you want the switch to opeate like 3560/3570/3550 etc

You need the IOS feature set IPACCESS you can then set all your ports to be type NNI

!
interface range fas0/1 - 24
shut
port-type nni
! ANY OTHER COMMON SETTINGS YOU WANT
no shut
!

Please the the config guides for your IOS version
e.g.
http://www.cisco.com/c/en/us/td/docs/switches/metro/me3400/software/release/12-2_25_seg_seg1/configuration/guide/3400scg/swint.html#wp1554661

Hope this helps

Regards
Alex

[Braian Jacomelli]

Thank you! I don't have too much experience with this device, but configure the ports to "NNI" solved the problem.

Regards

Braian