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New Member

No link on 1941 router when connected to routed port

During an installation, we plugged a Ruckus wireless bridge (powered by a PoE injector) into G0/0 on the 1941.  The port status remained down/down.  We then tried connecting it to G0/1.  Again, the port status remained down/down.  We took another wireless bridge, plugged it into G0/0 and the port changed to up/up status within a few seconds.  The same happened when connected to G0/1.  Both ports are have speed/duplex set to auto/auto.

We took the cable from the first wireless bridge and connected it a 3550 switch, the FastEthernet port went up/up.  We then took the cable and connected it to a switchport card (HWIC-4ESW) that was installed in the 1941 router.  The port came up/up.

We connected to wireless bridge back to G0/0 in the 1941 and manually set the speed/duplex to 1000/full.  The link light on the router became illuminated after a few seconds but no console message was displayed (nor did any events appear in the log) and a "show int g0/0" showed the port status as down/down. This was could not be duplicated as this only happened one time

The wireless bridges sit atop of a water tower and are connected each via a shielded ethernet cable.  The cable that we're having trouble with is cat5e STP and about 310feet in length.

I should note that we have not yet swapped the PoE injector but it seams to be functioning properly as power is getting to the wireless bridge and its accessible.  Also because if the wireless bridge for some reason didn't come back up after a power cycle it would potentially mean climbing the tower to perform a hard reset.  We tried another 1941 with same results however we have not tried another router model to rule out a potential platform issue. 

Can you recommend any troubleshooting steps to determine why the port status of the gig interfaces on the 1941 don't come up?

Everyone's tags (6)
4 REPLIES

Re: No link on 1941 router when connected to routed port

Hi Brian,

maybe stupid to suggest but i was wondering, aren't you using a cross-cable to connect Ruckus to the layer 3 port?

Alessio

New Member

No link on 1941 router when connected to routed port

Hey Alessio,

No, we are using a straight-through 568B cable. And as stated "We took another wireless bridge, plugged it into G0/0 and the port changed to up/up status within a few seconds." So cable "type" has also been verified to work

-Brian

No link on 1941 router when connected to routed port

Please postt the interface info

sh run int g0/0

sh int g0/0

thanks

Alessio

New Member

Re: No link on 1941 router when connected to routed port

unfortunately I do not have access to this router right now, but I do have the running config. The second interface config reflects nailing speed and duplex to 1000/Full. Same results on both

** Origional **

interface GigabitEthernet0/0

description XXX radio XXX

ip address 10.0.0.20 255.255.255.240

duplex auto

speed auto

** Changed speed/duplex for testing **

interface GigabitEthernet0/0

description XXX radio XXX

ip address 10.0.0.20 255.255.255.240

duplex full

speed 1000

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