Re: (PVID) inconsistency *PVID_Inc Issue

Hello Anser, I hope all is well.

I would suggest to check the configs on all switches. Make sure that the
allowed vlans and native vlans are consistent on both sides of each link.
You may need to hard code the core switch, even though the default native
vlan should be 1. IMO, what you are describing is a config issue, although
the only way I can recreate this is to manually misconfigure the native
vlans. There might also be a conflict with the defaults between the 2960
and your 6500.

On a side note, the access switch thinks that it is the spanning-tree root
for vlan 1 even with uplink fast enabled ... not related to your primary
issues, however as a note, I would suggest to have a consistent and
predicable spanning tree.

You should not have to tag the native vlan ... at least I have not had to in
the past. Not sure what you have configured on the 6500 and how the tagging
and native vlans are configured.

Not sure how helpful these comments are, however, I would probably suggest
you take an overall inventory and look at the configs across your network.
Sounds like either some configs are off, or the defaults are not playing
nice with each other.

Good luck and do please let us know how this goes. Kindest regards,

Andrew Lee Lissitz

On Sun, Nov 1, 2009 at 5:59 AM, Muhammad Anser Khan <manserkhan_at_gmail.com>wrote:

> Hello,
>
> Issue: Vlan 1 is in (PVID) inconsistency state on the Core switch for
> some access switches trunk ports.
>
> Native Vlan is 1 (same on all the switches)
>
> Find the output below:
>
> Core Switch (6513)
>
> SW-Core#sh spanning-tree inconsistentports
>
> Name Interface Inconsistency
> -------------------- ---------------------- ------------------
> VLAN0001 GigabitEthernet11/1 Port VLAN ID Mismatch
> VLAN0001 GigabitEthernet11/2 Port VLAN ID Mismatch
>
> SW-Core#sh spanning-tree vlan 1
>
> Interface Role Sts Cost Prio.Nbr Type
> ---------------- ---- --- --------- --------
> --------------------------------
> Gi11/1 Desg BKN*4 128.1281 P2p *PVID_Inc
> Gi11/2 Desg BKN*4 128.1282 P2p *PVID_Inc
>
> SW-Core#sh logging
>
> %SPANTREE-SP-2-RECV_PVID_ERR: Received BPDU with inconsistent peer
> vlan id 1 on GigabitEthernet11/2 VLAN1012.
>
> %SPANTREE-SP-2-BLOCK_PVID_PEER: Blocking GigabitEthernet11/2 on
> VLAN0001. Inconsistent peer vlan.
>
> SW-Core#sh spanning-tree vlan 1 detail | inc 11/2
> Port 1282 (GigabitEthernet11/2) of VLAN0001 is broken (Port VLAN ID
> Mismatch)
>
> BPDU: sent 0, received 1173 *************
>
> SW-GF-BB1#sh inter trunk
>
> Port Vlans in spanning tree forwarding state and not pruned
>
> Gi11/2 100-105
>
> ============================
>
> Access Switch(2960) :
>
> SWITCH 1 (which is connected through 11/2 of CORE SW)
>
> switch01#sh spanning-tree vlan 1
>
> VLAN0001
> Spanning tree enabled protocol ieee
> Root ID Priority 49153
> Address 0018.18aa.aaaa
> ******* This bridge is the root **********
> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
>
> Bridge ID Priority 49153 (priority 49152 sys-id-ext 1)
> Address 0018.18aa.aaaa
> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
> Aging Time 300
> Uplinkfast enabled
>
> Interface Role Sts Cost Prio.Nbr Type
> ---------------- ---- --- --------- --------
> --------------------------------
> Gi0/21 Desg FWD 3004 128.21 P2p
> Gi0/22 Desg FWD 3004 128.22 P2p
>
> " VLAN 1 is root bridge "
>
> Whereas all other Vlans are working normal.
>
> VLAN0100
> Spanning tree enabled protocol ieee
> Root ID Priority 100
> Address 0014.f1bb.bbbb
> Cost 3004
> Port 21 (GigabitEthernet0/21)
> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
>
> Bridge ID Priority 49252 (priority 49152 sys-id-ext 100)
> Address 0018.18aa.aaaa
> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
> Aging Time 300
> Uplinkfast enabled
>
> Interface Role Sts Cost Prio.Nbr Type
> ---------------- ---- --- --------- --------
> --------------------------------
> Gi0/21 Root FWD 3004 128.21 P2p
> Gi0/22 Altn BLK 3004 128.22 P2p
>
> On the Core switch:
>
> SW-Core#sh inter trunk
> Port Vlans in spanning tree forwarding state and not pruned
> Gi11/2 100-105
>
> I have fixed this issue by forcefully allowing under trunk interface(
> even though this the default):
>
> switchport trunk allowed vlan 1-4094
>
> After applying the above command, Core switch output changed to and
> the PVID_Inc error went away :
>
> SW-Core#sh inter trunk
> Port Vlans in spanning tree forwarding state and not pruned
> Gi11/2 1,100-105
>
> ================================
>
> I have solved this issue on 3560 Access Switch by applying:
>
> SW-3560(config)#vlan dot1q tag native
>
> Core Switch Logs :
>
> %SPANTREE-SP-2-UNBLOCK_CONSIST_PORT: Unblocking GigabitEthernet11/1
> on VLAN0001. Port consistency restored.
>
> I have many access switches with the same configuration but WHY I am
> getting this issue only on some switches. I want to know why this
> problem is random in nature (occurring on only some switches).
>
> Secondly "vlan dot1q tag native" is not supported some of the access
> switches(2960) but this command has applied on the core switch. Should
> I remove it from the Core switch or keep it there? What is the best
> practice? But other access switches are working properly without "vlan
> dot1q tag native" command.
>
> How can I fix this issue without applying "switchport trunk allowed
> vlan 1-4094".
>
> This problem is not solved by SHUT/NOSHUT under the trunk interfaces.
>
> All switching are working in PVST+ mode
>
> Regards,
> Anser
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net