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Why can't I get a vlan to take a spanning tree command and it enabled?

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FrankFlintstone16044
Level 1
Level 1

‎06-04-2022 08:59 AM

Hi

 

I have configured rapid-pvst on my switch and on the vlan but i can't see the config on the sh command

 

Switch#sh vlan

 

VLAN Name Status Ports

---- -------------------------------- --------- -------------------------------

1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4

Fa0/5, Fa0/6, Fa0/7, Fa0/8

Fa0/9, Fa0/10, Fa0/11, Fa0/12

Fa0/13, Fa0/14, Fa0/15, Fa0/16

Fa0/17, Fa0/18, Fa0/19, Fa0/21

Fa0/22, Fa0/23, Fa0/24

20 VLAN0020 active Fa0/20

1002 fddi-default active

1003 token-ring-default active

1004 fddinet-default active

1005 trnet-default active

 

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

1 enet 100001 1500 - - - - - 0 0

20 enet 100020 1500 - - - - - 0 0

1002 fddi 101002 1500 - - - - - 0 0

1003 tr 101003 1500 - - - - - 0 0

1004 fdnet 101004 1500 - - - ieee - 0 0

1005 trnet 101005 1500 - - - ibm - 0 0

 

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

 

Remote SPAN VLANs

------------------------------------------------------------------------------

 

Primary Secondary Type Ports

------- --------- ----------------- ------------------------------------------

Switch#

Switch#

Switch#

Switch#

Switch#

Switch#sh spanning-tree vlan 20

 

No spanning tree instance exists.

 

I can see the config on vlan 1 

 

Switch#sh spanning-tree vlan 1

VLAN0001

Spanning tree enabled protocol rstp

Root ID Priority 32769

Address 0001.9656.1306

Cost 19

Port 1(FastEthernet0/1)

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

 

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 0002.4A9C.CD4C

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

Aging Time 20

 

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Fa0/1 Root FWD 19 128.1 P2p

Fa0/2 Desg FWD 19 128.2 P2p

Fa0/3 Desg FWD 19 128.3 P2p

 

So a bit confused?  I have used both these cmds to set up spanning-tree but neither have worked

Switch#sh spanning-tree vlan 1

VLAN0001

Spanning tree enabled protocol rstp

Root ID Priority 32769

Address 0001.9656.1306

Cost 19

Port 1(FastEthernet0/1)

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

 

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 0002.4A9C.CD4C

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

Aging Time 20

 

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Fa0/1 Root FWD 19 128.1 P2p

Fa0/2 Desg FWD 19 128.2 P2p

Fa0/3 Desg FWD 19 128.3 P2p

 

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MHM Cisco World
VIP
VIP
In response to FrankFlintstone16044

‎06-04-2022 11:45 AM - edited ‎06-04-2022 12:24 PM

I know you want to be sure, 
only change the priority of SW for each VLAN and see the different.
I think this PKT so always there is some limitation on it.
this video for config rapid PVST and see it show rapid not PVST.

https://www.youtube.com/watch?v=p-LkyQMVk-g

View solution in original post

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10 Replies 10

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MHM Cisco World
VIP
VIP

‎06-04-2022 09:05 AM - edited ‎06-04-2022 09:12 AM

I see rstp not PVST so there is only one STP instance run which is STP VLAN1 
you need PVST to run different STP instance for other VLAN.

 

spanning-tree  Vlan-range<- this commend you need to run PVST for each vlan after enable it in global 

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Flavio Miranda
VIP
VIP

‎06-04-2022 10:01 AM

Hi

 You can enable with:

spanning-tree mode rapid-pvst

 

And you can see it with:

show spanning-tree summary

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Jon Marshall
Hall of Fame
Hall of Fame

‎06-04-2022 10:08 AM

 

Are there are any ports up/up that are either access ports in vlan 20 or trunk ports that allow vlan 20 ? 

 

That is probably why you are not seeing any output. 

 

Jon

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FrankFlintstone16044
Level 1
Level 1
In response to Jon Marshall

‎06-04-2022 10:53 AM

all ports are access ports and are up/up

 

 

Switch(config)#spanning-tree mode rapid-pvst

Switch(config)#exit

 

Enter configuration commands, one per line. End with CNTL/Z.

Switch(config)#int range fa0/5-20

Switch(config-if-range)#spanning-tree mode rapid-pvst

Enter configuration commands, one per line. End with CNTL/Z.

Switch(config)#int range fa0/5-20

Switch(config-if-range)#spanning-tree mode rapid-pvst

 

Switch(config)#do sh ip int brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/1 unassigned YES manual up up

FastEthernet0/2 unassigned YES manual up up

FastEthernet0/3 unassigned YES manual up up

FastEthernet0/4 unassigned YES manual down down

FastEthernet0/5 unassigned YES manual down down

FastEthernet0/6 unassigned YES manual down down

FastEthernet0/7 unassigned YES manual down down

FastEthernet0/8 unassigned YES manual down down

FastEthernet0/9 unassigned YES manual down down

FastEthernet0/10 unassigned YES manual down down

FastEthernet0/11 unassigned YES manual down down

FastEthernet0/12 unassigned YES manual down down

FastEthernet0/13 unassigned YES manual down down

FastEthernet0/14 unassigned YES manual down down

FastEthernet0/15 unassigned YES manual down down

FastEthernet0/16 unassigned YES manual down down

FastEthernet0/17 unassigned YES manual down down

FastEthernet0/18 unassigned YES manual down down

FastEthernet0/19 unassigned YES manual down down

FastEthernet0/20 unassigned YES manual down down

FastEthernet0/21 unassigned YES manual down down

FastEthernet0/22 unassigned YES manual down down

FastEthernet0/23 unassigned YES manual down down

FastEthernet0/24 unassigned YES manual down down

Vlan1 unassigned YES manual administratively down down

Vlan20 unassigned YES manual up down

 

 

Switch(config)#do sh ip int brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/1 unassigned YES manual up up

FastEthernet0/2 unassigned YES manual up up

FastEthernet0/3 unassigned YES manual up up

FastEthernet0/4 unassigned YES manual down down

FastEthernet0/5 unassigned YES manual down down

FastEthernet0/6 unassigned YES manual down down

FastEthernet0/7 unassigned YES manual down down

FastEthernet0/8 unassigned YES manual down down

FastEthernet0/9 unassigned YES manual down down

FastEthernet0/10 unassigned YES manual down down

FastEthernet0/11 unassigned YES manual down down

FastEthernet0/12 unassigned YES manual down down

FastEthernet0/13 unassigned YES manual down down

FastEthernet0/14 unassigned YES manual down down

FastEthernet0/15 unassigned YES manual down down

FastEthernet0/16 unassigned YES manual down down

FastEthernet0/17 unassigned YES manual down down

FastEthernet0/18 unassigned YES manual down down

FastEthernet0/19 unassigned YES manual down down

FastEthernet0/20 unassigned YES manual down down

FastEthernet0/21 unassigned YES manual down down

FastEthernet0/22 unassigned YES manual down down

FastEthernet0/23 unassigned YES manual down down

FastEthernet0/24 unassigned YES manual down down

Vlan1 unassigned YES manual administratively down down

Vlan20 unassigned YES manual up down

How do in configure a vlan range?

 

When i try it i get the folloowing

 

 

 

 

 

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FrankFlintstone16044
Level 1
Level 1

‎06-04-2022 10:58 AM

Switch(config)#do sh ip int brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/1 unassigned YES manual up up

FastEthernet0/2 unassigned YES manual up up

FastEthernet0/3 unassigned YES manual up up

FastEthernet0/4 unassigned YES manual down down

FastEthernet0/5 unassigned YES manual down down

FastEthernet0/6 unassigned YES manual down down

FastEthernet0/7 unassigned YES manual down down

FastEthernet0/8 unassigned YES manual down down

FastEthernet0/9 unassigned YES manual down down

FastEthernet0/10 unassigned YES manual down down

FastEthernet0/11 unassigned YES manual down down

FastEthernet0/12 unassigned YES manual down down

FastEthernet0/13 unassigned YES manual down down

FastEthernet0/14 unassigned YES manual down down

FastEthernet0/15 unassigned YES manual down down

FastEthernet0/16 unassigned YES manual down down

FastEthernet0/17 unassigned YES manual down down

FastEthernet0/18 unassigned YES manual down down

FastEthernet0/19 unassigned YES manual down down

FastEthernet0/20 unassigned YES manual down down

FastEthernet0/21 unassigned YES manual down down

FastEthernet0/22 unassigned YES manual down down

FastEthernet0/23 unassigned YES manual down down

FastEthernet0/24 unassigned YES manual down down

Vlan1 unassigned YES manual administratively down down

Vlan20 unassigned YES manual up down

 

No Fa0/20 is up and vlan is up and there it is...schoolboy mistake.  BUT it still shows as rstp and not rapid pvst?  why is this?

Switch(config)#do sh ip int brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/1 unassigned YES manual up up

FastEthernet0/2 unassigned YES manual up up

FastEthernet0/3 unassigned YES manual up up

FastEthernet0/4 unassigned YES manual down down

FastEthernet0/5 unassigned YES manual down down

FastEthernet0/6 unassigned YES manual down down

FastEthernet0/7 unassigned YES manual down down

FastEthernet0/8 unassigned YES manual down down

FastEthernet0/9 unassigned YES manual down down

FastEthernet0/10 unassigned YES manual down down

FastEthernet0/11 unassigned YES manual down down

FastEthernet0/12 unassigned YES manual down down

FastEthernet0/13 unassigned YES manual down down

FastEthernet0/14 unassigned YES manual down down

FastEthernet0/15 unassigned YES manual down down

FastEthernet0/16 unassigned YES manual down down

FastEthernet0/17 unassigned YES manual down down

FastEthernet0/18 unassigned YES manual down down

FastEthernet0/19 unassigned YES manual down down

FastEthernet0/20 unassigned YES manual down down

FastEthernet0/21 unassigned YES manual down down

FastEthernet0/22 unassigned YES manual down down

FastEthernet0/23 unassigned YES manual down down

FastEthernet0/24 unassigned YES manual down down

Vlan1 unassigned YES manual administratively down down

Vlan20 unassigned YES manual up down

 

Switch#sh spanning-tree vlan 20

VLAN0020

Spanning tree enabled protocol rstp

Root ID Priority 32788

Address 0002.4A9C.CD4C

This bridge is the root

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

 

Bridge ID Priority 32788 (priority 32768 sys-id-ext 20)

Address 0002.4A9C.CD4C

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

Aging Time 20

 

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Fa0/20 Desg FWD 19 128.20 P2p

 

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MHM Cisco World
VIP
VIP
In response to FrankFlintstone16044

‎06-04-2022 11:14 AM

Bridge ID Priority 32788 (priority 32768 sys-id-ext 20)

If

Show stp vlan 1 

Show different bridge ID 

Then now you sucess have 

Rapid pvst since now you have two different stp instance even if you not see pvst.

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Jon Marshall
Hall of Fame
Hall of Fame
In response to FrankFlintstone16044

‎06-04-2022 11:25 AM

 

That's just the way it reports it. 

 

Jon

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MHM Cisco World
VIP
VIP
In response to FrankFlintstone16044

‎06-04-2022 11:45 AM - edited ‎06-04-2022 12:24 PM

I know you want to be sure, 
only change the priority of SW for each VLAN and see the different.
I think this PKT so always there is some limitation on it.
this video for config rapid PVST and see it show rapid not PVST.

https://www.youtube.com/watch?v=p-LkyQMVk-g

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Jon Marshall
Hall of Fame
Hall of Fame
In response to MHM Cisco World

‎06-05-2022 01:43 AM - edited ‎06-05-2022 01:44 AM

 

FYI, it shows rstp even when that is rstp per vlan. 

 

Jon

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FrankFlintstone16044
Level 1
Level 1

‎06-04-2022 02:04 PM

it is such a pain the cli it is so illogical!   why show rstp when you have configured pvst?  Guys thank you so much for your help and the excellent you tube video

 

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