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N5548-VTP and spanning tree issue

Hi,

I am having issue with VTP incompatible on primary N5K

 

N5K-Primary#

vPC domain id                   : 53  
Peer status                     : peer adjacency formed ok      
vPC keep-alive status           : peer is alive                 
Configuration consistency status: success 
Per-vlan consistency status     : success                       
Type-2 consistency status       : failed  
Type-2 consistency reason       : VTP type-2 configuration incompatible
vPC role                        : primary, operational secondary
Number of vPCs configured       : 1   
Peer Gateway                    : Disabled
Dual-active excluded VLANs      : -
Graceful Consistency Check      : Enabled

N5K-Primary## sh vtp status 
VTP Status Information
----------------------
VTP Version                     : 2 (capable)
Configuration Revision          : 4
Maximum VLANs supported locally : 1005
Number of existing VLANs        : 9
VTP Operating Mode              : Server
VTP Domain Name                 : <VTP domain not acquired/configured yet>

VTP Pruning Mode                : Disabled (Operationally Disabled)
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Enabled
MD5 Digest                      : 0x9B 0x75 0x57 0x77 0x42 0x0B 0xC8 0x61
Configuration last modified by 0.0.0.0 at 6-24-14 04:58:25
Local updater ID is 0.0.0.0 
VTP version running             : 1

N5K-Primary# Sh spanning tree root

VLAN0001          4097 0023.04ee.be01       2    2   20  15    port-channel53
VLAN0300          4396 0023.04ee.be01       2    2   20  15    port-channel53
VLAN0302          4398 0023.04ee.be01       2    2   20  15    port-channel53
VLAN1000          5096 0023.04ee.be01       2    2   20  15    port-channel53
VLAN1001          5097 0023.04ee.be01       2    2   20  15    port-channel53
VLAN1007          5103 0023.04ee.be01       2    2   20  15    port-channel53
VLAN2701          6797 0023.04ee.be01       2    2   20  15    port-channel53

 

port-channel -53 is peer link going to secondary Nexus 5K

 

N5K-Secondary#

vPC domain id                   : 53  
Peer status                     : peer adjacency formed ok      
vPC keep-alive status           : peer is alive                 
Configuration consistency status: success 
Per-vlan consistency status     : success                       
Type-2 consistency status       : failed  
Type-2 consistency reason       : VTP type-2 configuration incompatible
vPC role                        : secondary, operational primary
Number of vPCs configured       : 1   
Peer Gateway                    : Disabled
Dual-active excluded VLANs      : -
Graceful Consistency Check      : Enabled

N5K-Secondary#Sh VTP status

VTP Version                     : 2 (capable)
Configuration Revision          : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs        : 5
VTP Operating Mode              : Transparent
VTP Domain Name                 : NNDC
VTP Pruning Mode                : Disabled (Operationally Disabled)
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Enabled
MD5 Digest                      : 0xC0 0x0B 0x29 0xBC 0x09 0x92 0x40 0x4B
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
VTP version running             : 1

N5K-Secondary# sh spanning-tree root 

                                        Root  Hello Max Fwd
Vlan                   Root ID          Cost  Time  Age Dly  Root Port
---------------- -------------------- ------- ----- --- ---  ----------------
VLAN0001          4097 0023.04ee.be01       1    2   20  15   port-channel253
VLAN0300          4396 0023.04ee.be01       1    2   20  15   port-channel253
VLAN0302          4398 0023.04ee.be01       1    2   20  15   port-channel253
VLAN1000          5096 0023.04ee.be01       1    2   20  15   port-channel253
VLAN1001          5097 0023.04ee.be01       1    2   20  15   port-channel253
VLAN1007          5103 0023.04ee.be01       1    2   20  15   port-channel253
VLAN2701          6797 0023.04ee.be01       1    2   20  15   port-channel253

 

port-channel-253 is port-channel going to nexus 7K's

************************************************************************************************************************

Question:

- I am going to fix the VTP by changing VTP mode on primary N5K matching to secondary ...On secondary i have VTP as transparent.

- My question is " if i change VTP mode on primary does my spanning tree root changes ??"

- How can i make spanning tree root on N5K primary pointing to port-channel-253 instead of  port-channel 53

**************************************************************************************************************************

 

1 Reply 1

Reza Sharifi
Hall of Fame
Hall of Fame

Hi,

It should not change the root.  Just make sure the primary device has lower id.

example:

spanning-tree vlan xxx priority 8192.

or if you are running mst

spanning-tree mst  xx priority 8192

and keep the secondary device as default.

HTH

 

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