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Speed/duplex negotiation problems btw cico devices.

Alexander Demin
Beginner
Beginner

Hello!

One end:

WS-C2960-24TT-L    12.2(50)SE3           C2960-LANBASEK9-M

#sh run int fa 0/1:

interface FastEthernet0/1

description TEST

end

Other end:

Unknown cisco device, perhaps, ME series switch (3400 or so..):

#sh run int Fa0/1
interface FastEthernet0/1
description TEST
port-type eni
switchport access vlan 5
l2protocol-tunnel cdp
l2protocol-tunnel stp
l2protocol-tunnel vtp

end

The problem:

When both ports are hardcoded to speed 100/duplex full - then they do not come up.

When they are set to auto (as shown in config) - they come up with 100/half-dup at both ends.

What could be the problem? Perhaps physical layer (bad line)? Or what?

Thanks in advance.

Alex

DAO21-RIPE
3 REPLIES 3

Robert R
Beginner
Beginner

Have you tried a cross-over cable between the 2 switches?

dwillie
Beginner
Beginner

100/half is the default setting for switchports which fail the auto-negotiation exchange, that indicates one side if failing to negotiate.  What happens when you set the 2960 to auto, and the ME for 100/full?

Thanks to all.

There was a switch-in-the-middle.At least it was set to 100/full. So ports on end points were set.

It works now as it should.

DAO21-RIPE
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