Negotiation Problem

[debora-santos]

I have a Cisco router 2921/K9 connected to a PADTECH DWDM.

But the interface doesn't go up. I guess this is a negotiation issue, but I didn't find how to disable the auto-negotiation on the interface.

Below you have the outputs from the router.

interface GigabitEthernet0/1
 no ip address
 media-type sfp
end

!

RT01PGA-NOVO#sh int g0/1
GigabitEthernet0/1 is down, line protocol is down
  Hardware is CN Gigabit Ethernet, address is 88f0.3185.fe11 (bia 88f0.3185.fe11)
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full Duplex, 1Gbps, media type is LX

!

[Tom Randstrom]

You indicated that the 2921's SFP is connected to the Padtech DWDM system.  Is the SFP plugged into a Padtech 1G transponder card to convert it to a DWDM wavelength?  The show interface indicates the SFP is a 1000BASE-LX, which is not compatible directly to a DWDM multiplexer without being converted to a DWDM compatible frequency. 

Additional network information would be helpful. 

SFP Transceiver Troubleshooting Guide

[debora-santos]

Thanks for answering.

Using this same SFP on a Cisco ASR the link goes up. The problem happens with Cisco 2921.

The topologies are:

2921 [sfp] ------------- DWDM  -> Link down

ASR [sfp] ------------- DWDM  -> Link up

[debora-santos]

Another guy had a similar problem (Cisco 3945 with SFP - full duplex possible?) but he solved his problem upgrading to 15.3 2T.

I tried that but it didn't work for me.