CCIE - Internetwork Expert's Online Community

hi all.  i'm stuck on 802.1q tunneling.  any thoughts?

SW1 (int 13) -- (int 13) SW2 (int 16)-- (int 16) SW3 (int 19)-- (int 19) SW4 all have 802.1q trunks configured and verified.

on sw1 i see the 802.1q tunnel but not on sw4 even though i copy and paste the same config

sw1

interface FastEthernet1/0/1
 switchport access vlan 100
 switchport mode dot1q-tunnel
 l2protocol-tunnel cdp
 no cdp enable

sw4

interface FastEthernet1/0/1
 switchport access vlan 100
 switchport mode dot1q-tunnel
 l2protocol-tunnel cdp
 no cdp enable

sw1#sh dot1q-tunnel

dot1q-tunnel mode LAN Port(s)
-----------------------------
Fa1/0/1
sw1#

sw4#sh dot1q-tunnel

dot1q-tunnel mode LAN Port(s)
-----------------------------No ports have been configured as dot1qtunnel

sw4#

Do you have vlan 100 configured on the intermediate switches, switch 2 & switch 3?  Also make sure your system mtu is 1504.

Nevermind my last post, I just did this task over again.  The tunnel on sw4 should be created on fa1/0/4 on your switch.  If you do a show ip interface brief on switch 4 it will probably show fa 1/0/1 as down/down which would be the reason why you can't see the tunnel configured.  Move the config from 1/0/1 to 1/0/4 since this is the correct interface connected to R4 in IE's topology.

lol, thanks!