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How do you configure an SFP port on a ISR 2911 router

Posted on 2014-12-16
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Last Modified: 2014-12-16
We have a 2911 ISR, but only one SFP will light up.   Two additional SPFs will not lite.   The one that lights up is connected to the ISP.   We have a switch that we need to connect to, using it's SFP.  When we plug the ISP connection into the switches SFP, it lights, so we no the switch is good.  Are there licenscing issue or any thing I'm missing?
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Question by:jimmycher
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Expert Comment

by:rharland2009
ID: 40502583
Can you show us the config of the switch? Perhaps the ports are disabled,
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Author Comment

by:jimmycher
ID: 40502618
No, the ports are active.  

The router G0/0/0 is hot, into the ISP.


We plugged the ISP connection directly into the Switch's SFP, and it lit.   We also plugged the ISP directly into G0/2/0 and it lit.  The problem is when G0/0/0 is into the ISP, we can not connect router G0/2/0 into the switchs SFP.  They both say down/down.    

Also, the G/0/0/0 SFP allows me to enter speed and duplex commands, but not G0/2/0. ??
  It looks like the Layer 1 conx are sound, and the ports are hot.   I'm thinking a license issue????
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rharland2009 earned 1500 total points
ID: 40502639
Just to clarify, when you say 'they both say down/down', do you mean that G0/0/0 goes down when you plug G0/2/0 into the switch, or just that neither the switch nor router end come up on the G0/2/0 connection?
I guess it must be licensing or some other limitation. Are these ports on-chassis or in a module?
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Author Comment

by:jimmycher
ID: 40503096
Haven't completed the install yet, but it appears that the SFP were okay; I did not set an Interface VLAN on the remote switch, nor did it have hosts, so it appeared down/down.   Probably the fourth time I've learned that lesson;  I will never understand why it doesn't say up/down when physically connected.....

Thanks for quick replies.

jc
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Author Closing Comment

by:jimmycher
ID: 40503098
thanks.
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