From: Ben (bmunyao@gmail.com)
Date: Wed Jun 27 2007 - 02:32:25 ART
Hi Group
This lab calls for the establishment of dot1q trunks and tunnel as depicted
below.
dot1q tunnel (EtherChannel)
-----------------------------------------------------------------------------------------
sw3--------------------------------sw4-----------------------------------------sw1
dot1q trunk | dot1q trunk
|
|dot1q trunk
|
|
sw2
The problem I encountered was the dot1q trunks between sw1-sw4 and sw2-sw4
reporting a "loopback detected" error and going into error-disabled state.
The spanning tree section involved using MST, and I confirmed that STP was
not disabled on any MST instance.
I configured the tunneling interfaces on sw4 as follows:
int f0/13, int f0/19
sw acc vl 100
sw trunk encap dot
sw mode dot1q
sw nonegotiate
l2protocol point-to-point lacp
l2protocol cdp
l2protocol vtp
int f0/15, int f0/21
sw acc vl 200
sw trunk encap dot
sw mode dot1q
sw nonegotiate
l2protocol point-to-point lacp
l2protocol cdp
l2protocol vtp
I configured MST on all switches as follows:
spann mode mst
spann mst config
name IESTP
ver 10
instance 1 vlan 1,5,12,107
instance 2 vlan 27,34,58
instance 3 vlan 46,89,363
Has anyone else done this lab and seen this problem? I couldn't figure it
out, and would welcome any input on what could have caused it.
Thanks
Ben
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