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Greetings all

I have tried to find an answer to and issue like this before but
without success.
I've tried for some day now to get a fiber connection between an
IMCnetworks MM850 GigabitTP<->Fiber converter up and running. The fiber
is on my end connected to a SX SPF. When I connect the cable and enable
the interface I get a LinkUp light on the media converter but no link
on my Cat6500. I've tried different autodetect, negotiation and speed
settings but nothing works. I've also tried different SPFs and switched
cables.
As a final solution I plugged the fiber cable into our 7301 router,
bypassing our Cat6500. After I set the port to "no negotiate auto" the
link went up on the 7301.

How can the same cable and same SPF work on the 7301 but not on my
Cat6500? Is there some setting I'm missing here?

Regards
Fredrik Hofgren

Hi Fredrik,

When a user cannot get a Gigabit Ethernet link up between a Cisco
switch and a non-Cisco device due to auto-negotiation incompatibility
and the cable between the devices is known to be good and is the
correct type, yet the link does not light up, one of these commands may
need to be issued on the Cisco Gigabit interface:

On a CatOS-based switch, the set port negotiation mod#/port# disable
command.

On a Cisco IOS-based switch, the no negotiation auto command.

Be sure to disable auto-negotiation on the connected device as well.

An alternative to disabling auto-negotiation is to contact the vendor
for a software or hardware upgrades for IEEE 802.3z Gigabit
auto-negotiation support.

For more information, refer to the Gigabit Auto-Negotiation (No Link to
Connected Device) section of Troubleshooting Cisco Catalyst Switches to
NIC Compatibility Issues:

http://www.cisco.com/en/US/products/...800a7af0.shtml

Sincerely,

Brad Reese
2007 Cisco Salary Rates
http://www.bradreese.com/compensation-database.htm