Nexus 5548p to a 3550 ISP switch - Fiber link won't light up

At a client, I'm trying to migrate from an old 6506 to a Nexus 5548p.  We tried to move over an ISP link and we can't get the port on the Nexus to light up.  The port is set as follows:

  switchport mode trunk
  speed 1000

The old 6506 port is set like this:

 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,111,113,115,116,118
 switchport mode trunk

We're using a GLC-SX-MM SFP on the Nexus.  Does anyone have any ideas as to why this isn't working?
Thanks.
ArdhamTechAsked:
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ArdhamTechConnect With a Mentor Author Commented:
We got the issue fixed.  The ISP had it set to autonegotiate, but it wasn't working.  We set both sides to 1g/full and it worked fine.  Thanks.
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Don JohnstonInstructorCommented:
How was the 6506 connected (what gbic)?
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eeRootCommented:
What physical port on the Nexus switch are you using?
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ArdhamTechAuthor Commented:
I fixed the issue on my own.
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