[c-nsp] Inconsistent vlan (6500, spanning tree)

[noble.tn at aol.in]

I did not see anything problematic from the configuration. Here is few
possible options that you may want to look at.

1) Use UDLD on all 4 ports involved in the trunk. If there any problem with
fiber/sfp, it should erro disable the port and prevent both ports from
forwarding due to error.
2) Try allowing explicitly VLAN 1 also over both trunks.
3) Try an ether channel combining both the primary and backup links if you
are not so specific to keep one link as back up always.
4) Try configuring the spanning tree root primary and secondary for all the
VLANs

Thank you,

-Noble

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Pshem Kowalczyk
Sent: Tuesday, December 04, 2007 12:05 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Inconsistent vlan (6500, spanning tree)

On 04/12/2007, Clinton Work <clinton at scripty.com> wrote:
>
> Is the new backup link just a dark fiber connection between the two
> boxes? From the error message it looks like the frames are being
> seriously corrupted at some point and that is causing the problems.
>
> The SPANTREE-SP-2-RECV_PVID_ERR error message indicates that the PVST+
> BPDU for vlan 53 was received on vlan 55.  Looking at your configuration
> I don't see how this is possible.  I have seen some strange behavior
> with faulty Supervisors, but nothing like this.

It is a copper SFP (cisco branded) in both 6500s. and just a piece of
cable between them. And yes, we've tried different cables ;-)

@noble.tn
6500-2:
Name: Gi1/48
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: 30,48-63,70,80,81
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Unknown unicast blocked: disabled
Unknown multicast blocked: disabled


and 6500-1:
Name: Gi1/38
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: 30,48-63,70,80,81
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Unknown unicast blocked: disabled
Unknown multicast blocked: disabled

sh vlan brief doesn't show anything usefull (the same on both of them):
6500-1:

VLAN Name                             Status    Ports
---- -------------------------------- ---------
-------------------------------
1    default                          active    Gi1/18, Gi1/20,
Gi1/22, Gi1/38, Gi1/48
30   Legacy_Filer                     active
48   vip-int                          active
49   filter-pub                       active
50   filter-cust                      active
51   smtpin                           active
52   smtpout                          active
53   smtpoutslow                      active
54   smtpbounce                       active
55   smtpreply                        active
56   smtplist                         active
57   maildrop                         active
58   mailbox                          active
59   webmail                          active
60   spare60                          active
61   ldap                             active
62   database                         active
63   dns                              active
70   EMC_Filer                        active
80   vip-pub                          active
81   host-out                         active
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup

and 6500-2:

VLAN Name                             Status    Ports
---- -------------------------------- ---------
-------------------------------
1    default                          active    Gi1/18, Gi1/20,
Gi1/43, Gi1/46, Gi1/48
30   Legacy_Filer                     active
48   vip-int                          active
49   filter-pub                       active
50   filter-cust                      active
51   smtpin                           active
52   smtpout                          active
53   smtpoutslow                      active
54   smtpbounce                       active
55   smtpreply                        active
56   smtplist                         active
57   maildrop                         active
58   mailbox                          active
59   webmail                          active
60   spare60                          active    Gi1/41, Gi1/44
61   ldap                             active
62   database                         active
63   dns                              active
70   EMC_Filer                        active
80   vip-pub                          active
81   host-out                         active
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup


kind regards
pshem
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