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

[Pshem Kowalczyk]

Hi,

Tonight we tried to bring up a second link between two 6500 (backup
link). After bringing the link up one of the 6500 started logging
(6500-2, config below):

Dec  4 01:54:13.067 NZDT: %SPANTREE-SP-2-RECV_PVID_ERR: Received BPDU
with inconsistent peer vlan id 53 on GigabitEthernet1/48 VLAN55.
Dec  4 01:54:13.067 NZDT: %SPANTREE-SP-2-BLOCK_PVID_PEER: Blocking
GigabitEthernet1/48 on VLAN0053. Inconsistent peer vlan.
Dec  4 01:54:13.067 NZDT: %SPANTREE-SP-2-BLOCK_PVID_LOCAL: Blocking
GigabitEthernet1/48 on VLAN0055. Inconsistent local vlan.
Dec  4 01:54:13.071 NZDT: %SPANTREE-SP-2-RECV_PVID_ERR: Received BPDU
with inconsistent peer vlan id 56 on GigabitEthernet1/48 VLAN58.
Dec  4 01:54:13.071 NZDT: %SPANTREE-SP-2-BLOCK_PVID_PEER: Blocking
GigabitEthernet1/48 on VLAN0056. Inconsistent peer vlan.
Dec  4 01:54:13.071 NZDT: %SPANTREE-SP-2-BLOCK_PVID_LOCAL: Blocking
GigabitEthernet1/48 on VLAN0058. Inconsistent local vlan.
Dec  4 01:54:13.155 NZDT: %SPANTREE-SP-2-RECV_PVID_ERR: Received BPDU
with inconsistent peer vlan id 57 on GigabitEthernet1/48 VLAN59.
Dec  4 01:54:13.155 NZDT: %SPANTREE-SP-2-BLOCK_PVID_PEER: Blocking
GigabitEthernet1/48 on VLAN0057. Inconsistent peer vlan.
Dec  4 01:54:13.155 NZDT: %SPANTREE-SP-2-BLOCK_PVID_LOCAL: Blocking
GigabitEthernet1/48 on VLAN0059. Inconsistent local vlan.

As you can see from the config below - that only happend to some of
the vlans. Unfortunately the other vlans weren't much happier -
spanning tree allowed both ports to forward traffic which quickly
overwhelmed the box, even thought 6500-1 stayed the root bridge and
6500-2 could see that through the primary interface.  We tried to shut
down the primary port to see if it fixes the problem, but even then
there was no connectivity over the backup link.


Configuration of the ports involved:
6500-1 (ports used gi1/47 - existing and gi1/38 - new/backup)

interface GigabitEthernet1/47
 description Layer 2 Trunk
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 30,48-63,70,80,81
 switchport mode trunk
 no ip address

interface GigabitEthernet1/38
 description Layer 2 Trunk backup
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 30,48-63,70,80,81
 switchport mode trunk
 no ip address

and on 6500-2 (here the messages were logged, gi1/47 - existing,
gi1/48 - new/backup)
interface GigabitEthernet1/47
 description Layer 2 Trunk
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 30,48-63,70,80,81
 switchport mode trunk
 no ip address

interface GigabitEthernet1/48
 description Layer 2 Trunk backup
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 30,48-63,70,80,81
 switchport mode trunk
 no ip address

software (on both boxes):
IOS (tm) s72033_rp Software (s72033_rp-ADVIPSERVICESK9_WAN-M), Version
12.2(18)SXF8, RELEASE SOFTWARE (fc2)

Both boxes run vrf-lite and route on the svi interfaces, configuration
of all of them is similiar to the one below:
interface Vlan58
 description mailbox
 ip vrf forwarding ContentInternal
 ip address 10.80.58.252 255.255.255.0
 no ip proxy-arp
 standby 58 ip 10.80.58.254

both boxes have the same config (just different ips).

Any ideas what might be causing the trouble? This was our second
attempt to get it sorted (previously we though that an interface on
6500-1 was fried) and after checking all the obvious stuff (including
cisco webpage) the second time - we're starting to run out of ideas.
Any hints welcome.

kind regards
Pshem