Cisco 3550 Switch to Cisco 3640 Router

[djdano]

Greetings, I am new to these forums. I am unable to get my cisco 3550 gigabit switch to talk to the 100 base FX interface on my 3640 router. I believe it has something to do with the speed differenes, because I can connect my switch to other gigabit devices no problem, and my router interface can connect to other 100mbs devices. The cabel has also been checked. Is there a way I can tell int g0/1 to operate at 100mbs I tried messing with the speed nonegotiate command, and bandwidth 100000, but no luck. Thanks,

Dano

 

[burtsbees]

Base-T will not communicate with fiber based interfaces.

Burt

 

[vipergg]

It is unclear what you are plugging , is it a copper connection between the 2 ? To change the interface speed on the 3550. Are you using a straight thru between the switch and router?

conf t
interface x/x
speed 100
duplex full

 

[vipergg]

If it is 2 fiber settings then you have to have the same speed gbics in each box , you cannot specify speeds on a fiber connection .

 

[djdano]

The Switch is a GBIC fiber device, the other is a 100 BASE FX Router Interface. I am unable to issue the speed 100 command on the GBIC Switch.

 

[vipergg]

That is normal you cannot set speed on a fiber connection.

 

[djdano]

Ok, so the speed can not be set, but should those devices be able to communicate? I get no link light between the 2. I have tried swaping TX and RX. I know my ports are good, I have done a GBIC to GBIC and it links up, also I have tossed a fiber loop on the router and it links up.

 

[MrNick0483]

1000 can't talk to 100.

 

[billyj1900]

Try changing your GBIC card to a 100mb card.