02-29-2008 08:46 AM - edited 03-05-2019 09:28 PM
I created 3 subinterfaces on a 3800 router for VLANs on different switches but the subintefaces protocl shows "down" {see attached for output}. Can someone tell me what I missing?
Thanks in advance,
sK
02-29-2008 08:50 AM
Hi
What is the gigabit interface connected into at the other end. It should be a switch and the port on the switch needs to be configured as an 802.1q trunk.
Jon
02-29-2008 08:52 AM
The physical interface is down, verify cabling.
What device is this physical interface attached to?
Can you post the configuration for the physical interface on this router and the device it's attached to?
__
Edison.
02-29-2008 09:25 AM
02-29-2008 09:53 AM
Okay, can you
1) check speed/duplex settings on both the 3800 and the 3560 switch
2) Try a different cable.
3) Post full interface configuration from router
Jon
02-29-2008 10:10 AM
I replaced the path cord and everything worked fine. I should have checked the patch cord first but I didn't since the same patch cord and setting was working fine with a different switch.
Thanks so much for your efforts.
sK
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