I have a 2620 connected to a 2924XL using ISL trunking. Three VLANs
configured on both sides, VLAN 1 is the management VLAN. I can ping
from the router to the switch and vice versa.
Now, I changed the encapulation type on both sides to dot1q and
communication breaks. Turning on debugging, I found the following
problem. Apparently, the 2620 is throwing out the ARP replies from the
switch. Here is the output from debup arp:
00:15:09: IP ARP: sent req src 10.16.102.70 0030.8546.b740,
dst 10.16.102.16 0000.0000.0000 FastEthernet0/0.1
00:15:09: IP ARP: sent req src 10.16.102.70 0030.8546.b740,
dst 10.16.102.16 0000.0000.0000 FastEthernet0/0.1
00:15:09: IP ARP rep filtered src 10.16.102.16 0005.3214.99c0, dst
10.16.102.70
0030.8546.b740 wrong cable, interface FastEthernet0/0
00:15:09: IP ARP rep filtered src 10.16.102.16 0005.3214.99c0, dst
10.16.102.70
0030.8546.b740 wrong cable, interface FastEthernet0/0
What the heck does wrong cable mean? The only potential problem I see
is that it is sending the ARP request out fa0/0.1, but receiving the
reply on fa0/0. Is there some configuration step that I'm missing?
I've never tried to configure dot1q before, but it seems to me that if
the native vlan is the same on both sides that the only configuration
difference would be the encapsulation type on each side.
Can any of you provide any advice concerning this? And changing back
to ISL isn't going to solve my problem because I'm just playing around
and I want to make this work! :-)
Thanks,
John
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