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VTP and spanning tree parameters

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ROBERTO TACCON
Level 4
Level 4

‎10-01-2002 02:41 AM - edited ‎03-02-2019 01:45 AM

I have a core 6500 configured as VTP SERVER and some access switches configured as VTP CLIENT and i modify the default Spanning tree key parameters for some VLAN on the 6500 the new values will be send to the access switches ?

On the CCO:

http://www.cisco.com/warp/public/473/21.html

When you add, delete, or change a VLAN in a Catalyst, the server Catalyst, where the changes were made, increments the configuration revision and issues a summary advertisement, followed by one or several subset advertisements...

The VTP protocols transport the Max Age, Hello Time, Forward Delay VLAN spanning tree information ?

Thanks in advance.

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bbranch
Level 3
Level 3
In response to ROBERTO TACCON

‎10-01-2002 03:59 AM

If you look at VLAN 10 in your example you can see that it shows both the local timer configuration and the inherited timers from the root bidge

The access switch is configured for:

Configured hello time 2, max age 20, forward delay 15

But it is using:

hello 1, max age 13, forward delay 9

which are those configured on the root bridge (Core Switch):

Bridge Max Age 13 sec Hello Time 1 sec Forward Delay 9 sec

View solution in original post

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bbranch
Level 3
Level 3

‎10-01-2002 03:18 AM

No these parameters are carried in the Spanning Tree Configuration BGPU's which are sent by the root bridge and are used by all bridges within the domain. VTP does not have the ability to distribute these values.

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ROBERTO TACCON
Level 4
Level 4
In response to bbranch

‎10-01-2002 03:40 AM

Thanks for the reply.

But why if i verify the spannning tree paramenters on a access switches i found that these values are different from that ones configured on the core switches ?

SWITCH CORE> (enable) sh config

This command shows non-default configurations only.

Use 'show config all' to show both default and non-default configurations.

!

!

!

#vlan

set spantree fwddelay 5 1

set spantree hello 1 1

set spantree maxage 7 1

set spantree priority 8192 1

set spantree fwddelay 5 2

set spantree hello 1 2

set spantree maxage 7 2

set spantree priority 8192 2

set spantree fwddelay 5 3

set spantree hello 1 3

set spantree maxage 7 3

set spantree priority 8192 3

set spantree fwddelay 9 10

set spantree hello 1 10

set spantree maxage 13 10

set spantree priority 16384 10

set spantree fwddelay 12 1003

set spantree maxage 16 1003

set spantree fwddelay 12 1005

set spantree maxage 16 1005

!

!

SWITCH ACCESS# sh run

!

spanning-tree vlan 1 max-age 7

spanning-tree vlan 2 max-age 7

spanning-tree vlan 3 max-age 7

spanning-tree vlan 4 max-age 7

spanning-tree vlan 5 max-age 7

spanning-tree vlan 6 max-age 7

spanning-tree vlan 7 max-age 7

spanning-tree vlan 8 max-age 7

spanning-tree vlan 9 max-age 7

spanning-tree vlan 1 hello-time 1

spanning-tree vlan 2 hello-time 1

spanning-tree vlan 3 hello-time 1

spanning-tree vlan 4 hello-time 1

spanning-tree vlan 5 hello-time 1

spanning-tree vlan 6 hello-time 1

spanning-tree vlan 7 hello-time 1

spanning-tree vlan 8 hello-time 1

spanning-tree vlan 9 hello-time 1

spanning-tree vlan 1 forward-time 5

spanning-tree vlan 2 forward-time 5

spanning-tree vlan 3 forward-time 5

spanning-tree vlan 4 forward-time 5

spanning-tree vlan 5 forward-time 5

spanning-tree vlan 6 forward-time 5

spanning-tree vlan 7 forward-time 5

spanning-tree vlan 8 forward-time 5

spanning-tree vlan 9 forward-time 5

!

!

!

!

SWITCH CORE> (enable) sh spantree 2

VLAN 2

Spanning tree mode PVST+

Spanning tree type ieee

Spanning tree enabled

Designated Root 00-d0-04-54-ac-01

Designated Root Priority 8192

Designated Root Cost 0

Designated Root Port 1/0

Root Max Age 7 sec Hello Time 1 sec Forward Delay 5 sec

Bridge ID MAC ADDR 00-d0-04-54-ac-01

Bridge ID Priority 8192

Bridge Max Age 7 sec Hello Time 1 sec Forward Delay 5 sec

SWITCH CORE> (enable) sh spantree 9

VLAN 9

Spanning tree mode PVST+

Spanning tree type ieee

Spanning tree enabled

Designated Root 00-d0-04-4c-54-08

Designated Root Priority 32768

Designated Root Cost 1

Designated Root Port 1/1-2,2/1-2,4/15-16,7/15-16 (agPort 13/1)

Root Max Age 20 sec Hello Time 2 sec Forward Delay 9 sec

Bridge ID MAC ADDR 00-d0-04-54-ac-08

Bridge ID Priority 32768

Bridge Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec

SWITCH CORE> (enable) sh spantree 10

VLAN 10

Spanning tree mode PVST+

Spanning tree type ieee

Spanning tree enabled

Designated Root 00-d0-04-54-ac-09

Designated Root Priority 16384

Designated Root Cost 0

Designated Root Port 1/0

Root Max Age 13 sec Hello Time 1 sec Forward Delay 9 sec

Bridge ID MAC ADDR 00-d0-04-54-ac-09

Bridge ID Priority 16384

Bridge Max Age 13 sec Hello Time 1 sec Forward Delay 9 sec

SWITCH ACCESS#sh spanning-tree vlan 2

Spanning tree 2 is executing the IEEE compatible Spanning Tree protocol

Bridge Identifier has priority 49152, address 0002.7d7a.32c1

Configured hello time 1, max age 7, forward delay 5

Current root has priority 8192, address 00d0.0454.ac01

Root port is 48, cost of root path is 3004

Topology change flag not set, detected flag not set, changes 897

Times: hold 1, topology change 12, notification 1

hello 1, max age 7, forward delay 5

Timers: hello 0, topology change 0, notification 0

Fast uplink switchover is enabled

Stack port is GigabitEthernet0/1

SWITCH ACCESS#sh spanning-tree vlan 9

Spanning tree 9 is executing the IEEE compatible Spanning Tree protocol

Bridge Identifier has priority 49152, address 0002.7d7a.32c8

Configured hello time 1, max age 7, forward delay 5

Current root has priority 32768, address 00d0.044c.5408

Root port is 40, cost of root path is 3008

Topology change flag not set, detected flag not set, changes 8

Times: hold 1, topology change 12, notification 2

hello 2, max age 20, forward delay 9

Timers: hello 0, topology change 0, notification 0

Fast uplink switchover is enabled

Stack port is GigabitEthernet0/1

SWITCH ACCESS#sh spanning-tree vlan 10

Spanning tree 10 is executing the IEEE compatible Spanning Tree protocol

Bridge Identifier has priority 49152, address 0002.7d7a.32c9

Configured hello time 2, max age 20, forward delay 15

Current root has priority 16384, address 00d0.0454.ac09

Root port is 48, cost of root path is 3004

Topology change flag not set, detected flag not set, changes 11

Times: hold 1, topology change 35, notification 1

hello 1, max age 13, forward delay 9

Timers: hello 0, topology change 0, notification 0

Fast uplink switchover is enabled

Stack port is GigabitEthernet0/1

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Go to solution
bbranch
Level 3
Level 3
In response to ROBERTO TACCON

‎10-01-2002 03:59 AM

If you look at VLAN 10 in your example you can see that it shows both the local timer configuration and the inherited timers from the root bidge

The access switch is configured for:

Configured hello time 2, max age 20, forward delay 15

But it is using:

hello 1, max age 13, forward delay 9

which are those configured on the root bridge (Core Switch):

Bridge Max Age 13 sec Hello Time 1 sec Forward Delay 9 sec

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