From: Hobbs (deadheadblues@gmail.com)
Date: Sun Nov 30 2008 - 02:44:27 ARST
sorry, please disregard, wrong list.
On Sat, Nov 29, 2008 at 9:43 PM, Hobbs <deadheadblues@gmail.com> wrote:
> I noticed something strange while playing around with this lab. Cat1 and
> Cat4 both think they are root for the vlans 12, 40 and 240. I even loaded
> the ipexpert final configs and the issue still exists.
>
> Cat1#show spanning-tree vlan 12 | inc root
> This bridge is the root
> Cat1#show spanning-tree vlan 40 | inc root
> This bridge is the root
> Cat1#show spanning-tree vlan 240 | inc root
> This bridge is the root
>
> Cat4#show spanning-tree vlan 12 | inc root
> This bridge is the root
> Cat4#show spanning-tree vlan 40 | inc root
> This bridge is the root
> Cat4#show spanning-tree vlan 240 | inc root
> This bridge is the root
>
> Now Cat1 and Cat4 don't have any trunks directly connected (due to
> tunneling) so I am guessing somewhere along the line BPDUs are not getting
> tunneled. Cat3 is "between" Cat1 and Cat4 and it shows Cat4 as root (through
> Po34).
>
> Cat3#show spanning-tree vlan 12 root | inc VL
> VLAN0012 32780 0019.2f02.e980 9 2 20 15
> Po34
> Cat3#show spanning-tree vlan 40 root | inc VL
> VLAN0040 32808 0019.2f02.e980 9 2 20 15
> Po34
> Cat3#show spanning-tree vlan 240 root | inc VL
> VLAN0240 33008 0019.2f02.e980 9 2 20 15
> Po34
>
> It looks like Cat3 is not hearing any of Cat1's BPDUs. Otherwise it would
> pick Cat1 as root because Cat1 has a lower mac address. Haven't been able to
> completely sort this one out but here is one more note:
>
> -If I disable f0/19 on cat1 and cat3, BPDUs flow over the next link in the
> bundle (f0/21) and cat4 and cat3 see cat1 as root (rightly so since cat1 has
> lower mac). So it looks like the tunnel from cat3 to cat4 is working right,
> but not the one from cat1 to cat3.
>
> My session is just about over for this one, but any comments or thoughts
> for next time will be greatly appreciated.
>
> thanks!
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