I have a bit of a strange problem. I am trying to tunnel a number of vlans across my network.
I have cisco 1841 router that has a number of vlans assigend to sub interfaces. and i need to get this traffic across the site. Rather than set up all these vlans on my live network I have chosen to tunnel them across using a dot1q tunnel.
so set up my tunnel ports to be vlan 21 and assigen them as dot1q tunnels, (and created vlan 21 on all switchs and insured its allowed on all trunks)
the port on the router tags all traffic as it is using sub interfaces. and the far end switch also is set to trunk.
LAstly I need to be able to acces the managemnt traffic, so the far end swith has a second trunk port that allows only vlan 900 (managemt) back on the to site network, and my desk top pc is connected to a port assigned to vlan 900..
my Problem is that I can telnet to the devices on this netowork (it the router and switch). however if I try to ftp to the router (copy a new IOS) or use SDM to connect to it. it starts working, but then after a few bytes of data it sundley stops! it looks from a packet captuer like the router stops responding, but I can still ssh jsut fine.
Any ideas what may be causing this? any one else had problems when running vlan tunnels? tunnl-digram.jpg
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