How to turn off fiber GBIC and force 3925e router to use copper NIC?

[Owen Mould]

We have a 3925e router running IOS 15.1(4)M6. One of its current WAN connections is 1000BaseT. We want to migrate it to 1000BaseF. We have the GBIC (GLC-SX-MM) and I know I can just drop it in there.

HOWEVER: I would like to drop it in there whenever I want and have the router continue to use the 1000BaseT interface until I'm ready to switch over. What's the command for "ignore that GBIC and keep using the copper interface"?

Thanks!

[John Blakley]

The default, at least I believe, is g0/0 in software. If you're using g0/1 or 2 now, are you concerned if you connect the fiber module to the router that it will try to pass traffic over that interface instead? If so, you can shut g0/0 and insert your module now and it won't come up until you bring the interface up....I think I'm completely misunderstanding what you're wanting.

HTH,
John

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[Karsten Iwen · Accepted solution]

I think you are looking for the "media-type rj45" command in interface-mode. Later you change to "media-type sfp" when you are ready to switch links.

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[Owen Mould]

Right you are. I tried that before, but it didn't work--because I didn't have anything plugged into it.

Sorry, it's my first day back from vacation and I'm getting some ID10T errors!