From: Ben (bmunyao@gmail.com)
Date: Wed Jun 27 2007 - 14:03:58 ART
Eric
While doing the lab yesterday, I was able to continue with the rest of the
lab by shutting down the etherchannel interfaces on sw1 and sw3. I couldn't
help thinking "thank god this was a practise lab, and no the real thing."
Lets hope we or someone else can figure this out.
I'll be repeating the lab in 12hrs (my next rack rental) and see if I can
crack it.
Thanks
Ben
On 6/27/07, Eric Poulin <epoulins@yahoo.com> wrote:
>
> Ben,
>
> I ran into the same problem and I could not figure it out. Please let me
> know if you ever
> find the answer?
>
> Thanks,
> Eric
>
> --- Ben <bmunyao@gmail.com> wrote:
>
> > 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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> >
>
>
>
>
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