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New Member

problem connecting Cat5505 and Cat3548 through fiber

We want to connect a Cat5505 with a Cat3548XL through a fiber trunk.

Fiber is MMF. GBIC's are 1000-base-SX, WS-G5484.

The LED on the 5505 is green. The LED on the 3548 stays out.

On the 5505 the link shows trunking mode.

On the 3548 the link show line down, protocol down.

We tried several IOS version on the 3548. The 5505 is live, so we can not upgrade the sw easily. The current IOS level on the 5505 is 4.2(1).

On the 3548 we tried 12.05.2XU and 12.05.3WC1.

The 5505 is connected with other 5505's through fiber with no problems.

Any suggestion what can be wrong ?

4 REPLIES
Cisco Employee

Re: problem connecting Cat5505 and Cat3548 through fiber

Try doing a no shut under gig interface. What configuration do you have under the gig interface on the XL? Can you paste it? Also paste the output of "sh trunk" from the 5505

Bronze

Re: problem connecting Cat5505 and Cat3548 through fiber

Please try to turn off port negotiation on the 3500

CH-3500XL-8A(config)#int gig 0/1

CH-3500XL-8A(config-if)#no neo

CH-3500XL-8A(config-if)#no neg

CH-3500XL-8A(config-if)#no negotiation auto

CH-3500XL-8A(config-if)#

Hope this helps

New Member

Re: problem connecting Cat5505 and Cat3548 through fiber

The LED indicates the state of the physical layer. You say that the LED on the C5505 is green and the LED on the C3548 is out. This would indicate that the C5505 can see light from the C3548, but the C3548 does not see light from the C5505. Try looping each of them back on themselves (think about light levels and attenuators). The LED should turn green. If not, look for trouble at the end that fails to turn green. Also, check the fiber patch cord. One strand of glass could be bad or the end could be dirty.

New Member

Re: problem connecting Cat5505 and Cat3548 through fiber

Thank you for your response.

We found out there is a physical layer problem in the board on the c5505.

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