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Community Member

GTC-T SFP is coming Up


In 7609 router i am using WS-X6724-SFP in that we connected 100mbps link through GLC-T copper SFP.But link is not coming up.But if i connected through switch and to router its coming up.

Please help me out to resolve the issue.

Community Member

Re: GTC-T SFP is coming Up

I would start at the physical layer. Make sure that you are using a crossover cable if connecting from router to router or from PC to router. If that doesn't work, try hard coding the speed on each side, it might be a negotiation issue.

Hope this helps,


Community Member

Re: GTC-T SFP is coming Up

I tried with crossover also and i cant able to change the speed also.its supports only 1Gig only.

Hall of Fame Super Silver

Re: GTC-T SFP is coming Up

Hello Chandra,

I think that GLC-T copper SFP doesn't make the port capable to run at 100 Mbps.

I think it is only able to run 1000 Mbps full-duplex.

You need to use a native Rj-45 port with 10/100/1000 capability for this.

Hope to help


Community Member

Re: GTC-T SFP is coming Up

Giuseppe is right,

I double checked the compatibility matrix, and although this SFP is 10,100,1000 it doesn't work at any speed other than 1000 on the 6724 module.


Community Member

Re: GTC-T SFP is coming Up

Hi just wondering if anyone can confirm this. We have an SFP-T in a module in our 2821 router and are tring to connect this to a 100Mb Metroethernet connection and does not come. Plugging the Metroethernet into the system gigs works ok as i assume they auto negotiate to 100Mb but these are already in use.

Can you run a SFP-T at 100Mb if yes how ?

Many thanks

Cisco Employee

Re: GTC-T SFP is coming Up

Hi David,

Do you mean GLC-T or SFP-GE-T? The SFP-GE-T is 1GB only with extended operating temperature range and DOM support, and it is not supported to use with the 2800 platform.

Speed for GLC-T and SFP-GE-T can be verified with sh int cap command



Hall of Fame Super Gold

Re: GTC-T SFP is coming Up

GLC-T will only negotiate to 1Gb on a WS-6724 blade module.

I believe Edison mentioned something about the logic behind this is because no one from Cisco would image this blade to negotiate anything but 1Gb.

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