strange STP behaviour : stack port in "sh spanning-tree" output

Discussion in 'Cisco' started by Giuseppe, Feb 5, 2008.

  1. Giuseppe

    Giuseppe Guest

    Hi All

    I have three 3750 switch connected in stack ...

    Issuing "sh spanning-tree root port" only for VLAN 242 and 243 you can
    see stack port 1 as root port ....

    This is quite stange ....

    Have you ever happened something like this???

    All works well but I cannot understand if this behaviour is correct...

    regards

    Giuseppe


    p.s. in attach two useful output...



    sw-com1-be#sh spanning-tree root port
    VLAN0001 GigabitEthernet3/0/23
    VLAN0002 GigabitEthernet3/0/23
    VLAN0003 GigabitEthernet3/0/23
    VLAN0018 GigabitEthernet3/0/23
    VLAN0038 GigabitEthernet3/0/23
    VLAN0048 GigabitEthernet3/0/23
    VLAN0085 GigabitEthernet3/0/23
    VLAN0216 GigabitEthernet3/0/23
    VLAN0242 StackPort1
    VLAN0243 StackPort1
    VLAN0315 GigabitEthernet3/0/23
    VLAN0316 GigabitEthernet3/0/23
    VLAN0317 GigabitEthernet3/0/23
    VLAN0318 GigabitEthernet3/0/23
    VLAN0320 GigabitEthernet3/0/23
    VLAN0330 GigabitEthernet3/0/23
    VLAN0400 GigabitEthernet3/0/23
    sw-com1-be#sh spanning-tree summary
    Switch is in pvst mode
    Root bridge for: none
    Extended system ID is enabled
    Portfast Default is disabled
    PortFast BPDU Guard Default is disabled
    Portfast BPDU Filter Default is disabled
    Loopguard Default is disabled
    EtherChannel misconfig guard is enabled
    UplinkFast is enabled
    Stack port is StackPort1
    BackboneFast is enabled
    Configured Pathcost method used is short

    Name Blocking Listening Learning Forwarding STP Active
    ---------------------- -------- --------- -------- ---------- ----------
    VLAN0001 1 0 0 1 2
    VLAN0002 1 0 0 1 2
    VLAN0003 1 0 0 1 2
    VLAN0018 1 0 0 1 2
    VLAN0038 1 0 0 1 2
    VLAN0048 1 0 0 1 2
    VLAN0085 1 0 0 3 4
    VLAN0216 1 0 0 1 2
    VLAN0242 - 245 - 249 - 253 -1872756559 1012957184
    VLAN0243 - 245 - 249 - 253 -1872756559 1012957184
    VLAN0315 1 0 0 2 3
    VLAN0316 1 0 0 1 2
    VLAN0317 1 0 0 3 4
    VLAN0318 1 0 0 2 3
    VLAN0320 1 0 0 4 5
    VLAN0330 1 0 0 1 2
    VLAN0400 1 0 0 1 2
    ---------------------- -------- --------- -------- ---------- ----------
    17 vlans - 475 - 498 - 506 549454202 2025914407

    Station update rate set to 150 packets/sec.

    UplinkFast statistics
    -----------------------
    Number of transitions via uplinkFast (all VLANs) : 0
    Number of proxy multicast addresses transmitted (all VLANs) : 2404

    BackboneFast statistics
    -----------------------
    Number of transition via backboneFast (all VLANs) : 0
    Number of inferior BPDUs received (all VLANs) : 10
    Number of RLQ request PDUs received (all VLANs) : 20
    Number of RLQ response PDUs received (all VLANs) : 0
    Number of RLQ request PDUs sent (all VLANs) : 10
    Number of RLQ response PDUs sent (all VLANs) : 0
     
    Giuseppe, Feb 5, 2008
    #1
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  2. Giuseppe

    Trendkill Guest

    Re: strange STP behaviour : stack port in "sh spanning-tree" output

    On Feb 5, 10:20 am, Giuseppe <> wrote:
    > Hi All
    >
    > I have three 3750 switch connected in stack ...
    >
    > Issuing "sh spanning-tree root port" only for VLAN 242 and 243 you can
    > see stack port 1 as root port ....
    >
    > This is quite stange ....
    >
    > Have you ever happened something like this???
    >
    > All works well but I cannot understand if this behaviour is correct...
    >
    > regards
    >
    > Giuseppe
    >
    > p.s. in attach two useful output...
    >
    > [sh spanning-tree root.txt]
    >
    > sw-com1-be#sh spanning-tree root port
    > VLAN0001 GigabitEthernet3/0/23
    > VLAN0002 GigabitEthernet3/0/23
    > VLAN0003 GigabitEthernet3/0/23
    > VLAN0018 GigabitEthernet3/0/23
    > VLAN0038 GigabitEthernet3/0/23
    > VLAN0048 GigabitEthernet3/0/23
    > VLAN0085 GigabitEthernet3/0/23
    > VLAN0216 GigabitEthernet3/0/23
    > VLAN0242 StackPort1
    > VLAN0243 StackPort1
    > VLAN0315 GigabitEthernet3/0/23
    > VLAN0316 GigabitEthernet3/0/23
    > VLAN0317 GigabitEthernet3/0/23
    > VLAN0318 GigabitEthernet3/0/23
    > VLAN0320 GigabitEthernet3/0/23
    > VLAN0330 GigabitEthernet3/0/23
    > VLAN0400 GigabitEthernet3/0/23
    >
    > [sh spanning-tree summary.txt]sw-com1-be#sh spanning-tree summary
    > Switch is in pvst mode
    > Root bridge for: none
    > Extended system ID is enabled
    > Portfast Default is disabled
    > PortFast BPDU Guard Default is disabled
    > Portfast BPDU Filter Default is disabled
    > Loopguard Default is disabled
    > EtherChannel misconfig guard is enabled
    > UplinkFast is enabled
    > Stack port is StackPort1
    > BackboneFast is enabled
    > Configured Pathcost method used is short
    >
    > Name Blocking Listening Learning Forwarding STP Active
    > ---------------------- -------- --------- -------- ---------- ----------
    > VLAN0001 1 0 0 1 2
    > VLAN0002 1 0 0 1 2
    > VLAN0003 1 0 0 1 2
    > VLAN0018 1 0 0 1 2
    > VLAN0038 1 0 0 1 2
    > VLAN0048 1 0 0 1 2
    > VLAN0085 1 0 0 3 4
    > VLAN0216 1 0 0 1 2
    > VLAN0242 - 245 - 249 - 253 -1872756559 1012957184
    > VLAN0243 - 245 - 249 - 253 -1872756559 1012957184
    > VLAN0315 1 0 0 2 3
    > VLAN0316 1 0 0 1 2
    > VLAN0317 1 0 0 3 4
    > VLAN0318 1 0 0 2 3
    > VLAN0320 1 0 0 4 5
    > VLAN0330 1 0 0 1 2
    > VLAN0400 1 0 0 1 2
    > ---------------------- -------- --------- -------- ---------- ----------
    > 17 vlans - 475 - 498 - 506 549454202 2025914407
    >
    > Station update rate set to 150 packets/sec.
    >
    > UplinkFast statistics
    > -----------------------
    > Number of transitions via uplinkFast (all VLANs) : 0
    > Number of proxy multicast addresses transmitted (all VLANs) : 2404
    >
    > BackboneFast statistics
    > -----------------------
    > Number of transition via backboneFast (all VLANs) : 0
    > Number of inferior BPDUs received (all VLANs) : 10
    > Number of RLQ request PDUs received (all VLANs) : 20
    > Number of RLQ response PDUs received (all VLANs) : 0
    > Number of RLQ request PDUs sent (all VLANs) : 10
    > Number of RLQ response PDUs sent (all VLANs) : 0


    Please post show vlan and show trunk (or equivalent in IOS, something
    like show interface switchport).
     
    Trendkill, Feb 5, 2008
    #2
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  3. Giuseppe

    Giuseppe Guest

    Re: strange STP behaviour : stack port in "sh spanning-tree" output

    In attahach show interfaces trunk

    Thanks

    Giuseppe


    Trendkill ha scritto:
    > On Feb 5, 10:20 am, Giuseppe <> wrote:
    >> Hi All
    >>
    >> I have three 3750 switch connected in stack ...
    >>
    >> Issuing "sh spanning-tree root port" only for VLAN 242 and 243 you can
    >> see stack port 1 as root port ....
    >>
    >> This is quite stange ....
    >>
    >> Have you ever happened something like this???
    >>
    >> All works well but I cannot understand if this behaviour is correct...
    >>
    >> regards
    >>
    >> Giuseppe
    >>
    >> p.s. in attach two useful output...
    >>
    >> [sh spanning-tree root.txt]
    >>
    >> sw-com1-be#sh spanning-tree root port
    >> VLAN0001 GigabitEthernet3/0/23
    >> VLAN0002 GigabitEthernet3/0/23
    >> VLAN0003 GigabitEthernet3/0/23
    >> VLAN0018 GigabitEthernet3/0/23
    >> VLAN0038 GigabitEthernet3/0/23
    >> VLAN0048 GigabitEthernet3/0/23
    >> VLAN0085 GigabitEthernet3/0/23
    >> VLAN0216 GigabitEthernet3/0/23
    >> VLAN0242 StackPort1
    >> VLAN0243 StackPort1
    >> VLAN0315 GigabitEthernet3/0/23
    >> VLAN0316 GigabitEthernet3/0/23
    >> VLAN0317 GigabitEthernet3/0/23
    >> VLAN0318 GigabitEthernet3/0/23
    >> VLAN0320 GigabitEthernet3/0/23
    >> VLAN0330 GigabitEthernet3/0/23
    >> VLAN0400 GigabitEthernet3/0/23
    >>
    >> [sh spanning-tree summary.txt]sw-com1-be#sh spanning-tree summary
    >> Switch is in pvst mode
    >> Root bridge for: none
    >> Extended system ID is enabled
    >> Portfast Default is disabled
    >> PortFast BPDU Guard Default is disabled
    >> Portfast BPDU Filter Default is disabled
    >> Loopguard Default is disabled
    >> EtherChannel misconfig guard is enabled
    >> UplinkFast is enabled
    >> Stack port is StackPort1
    >> BackboneFast is enabled
    >> Configured Pathcost method used is short
    >>
    >> Name Blocking Listening Learning Forwarding STP Active
    >> ---------------------- -------- --------- -------- ---------- ----------
    >> VLAN0001 1 0 0 1 2
    >> VLAN0002 1 0 0 1 2
    >> VLAN0003 1 0 0 1 2
    >> VLAN0018 1 0 0 1 2
    >> VLAN0038 1 0 0 1 2
    >> VLAN0048 1 0 0 1 2
    >> VLAN0085 1 0 0 3 4
    >> VLAN0216 1 0 0 1 2
    >> VLAN0242 - 245 - 249 - 253 -1872756559 1012957184
    >> VLAN0243 - 245 - 249 - 253 -1872756559 1012957184
    >> VLAN0315 1 0 0 2 3
    >> VLAN0316 1 0 0 1 2
    >> VLAN0317 1 0 0 3 4
    >> VLAN0318 1 0 0 2 3
    >> VLAN0320 1 0 0 4 5
    >> VLAN0330 1 0 0 1 2
    >> VLAN0400 1 0 0 1 2
    >> ---------------------- -------- --------- -------- ---------- ----------
    >> 17 vlans - 475 - 498 - 506 549454202 2025914407
    >>
    >> Station update rate set to 150 packets/sec.
    >>
    >> UplinkFast statistics
    >> -----------------------
    >> Number of transitions via uplinkFast (all VLANs) : 0
    >> Number of proxy multicast addresses transmitted (all VLANs) : 2404
    >>
    >> BackboneFast statistics
    >> -----------------------
    >> Number of transition via backboneFast (all VLANs) : 0
    >> Number of inferior BPDUs received (all VLANs) : 10
    >> Number of RLQ request PDUs received (all VLANs) : 20
    >> Number of RLQ response PDUs received (all VLANs) : 0
    >> Number of RLQ request PDUs sent (all VLANs) : 10
    >> Number of RLQ response PDUs sent (all VLANs) : 0

    >
    > Please post show vlan and show trunk (or equivalent in IOS, something
    > like show interface switchport).



    sw-com1-be# sh interfaces trunk

    Port Mode Encapsulation Status Native vlan
    Gi3/0/23 on 802.1q trunking 1
    Gi3/0/24 on 802.1q trunking 1

    Port Vlans allowed on trunk
    Gi3/0/23 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    Gi3/0/24 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402

    Port Vlans allowed and active in management domain
    Gi3/0/23 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    Gi3/0/24 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402

    Port Vlans in spanning tree forwarding state and not pruned
    Gi3/0/23 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    Gi3/0/24 34,72,240-243,401-402
     
    Giuseppe, Feb 5, 2008
    #3
  4. Giuseppe

    Trendkill Guest

    Re: strange STP behaviour : stack port in "sh spanning-tree" output

    On Feb 5, 12:43 pm, Giuseppe <> wrote:
    > In attahach show interfaces trunk
    >
    > Thanks
    >
    > Giuseppe
    >
    > Trendkill ha scritto:
    >
    > > On Feb 5, 10:20 am, Giuseppe <> wrote:
    > >> Hi All

    >
    > >> I have three 3750 switch connected in stack ...

    >
    > >> Issuing "sh spanning-tree root port" only for VLAN 242 and 243 you can
    > >> see stack port 1 as root port ....

    >
    > >> This is quite stange ....

    >
    > >> Have you ever happened something like this???

    >
    > >> All works well but I cannot understand if this behaviour is correct...

    >
    > >> regards

    >
    > >> Giuseppe

    >
    > >> p.s. in attach two useful output...

    >
    > >> [sh spanning-tree root.txt]

    >
    > >> sw-com1-be#sh spanning-tree root port
    > >> VLAN0001 GigabitEthernet3/0/23
    > >> VLAN0002 GigabitEthernet3/0/23
    > >> VLAN0003 GigabitEthernet3/0/23
    > >> VLAN0018 GigabitEthernet3/0/23
    > >> VLAN0038 GigabitEthernet3/0/23
    > >> VLAN0048 GigabitEthernet3/0/23
    > >> VLAN0085 GigabitEthernet3/0/23
    > >> VLAN0216 GigabitEthernet3/0/23
    > >> VLAN0242 StackPort1
    > >> VLAN0243 StackPort1
    > >> VLAN0315 GigabitEthernet3/0/23
    > >> VLAN0316 GigabitEthernet3/0/23
    > >> VLAN0317 GigabitEthernet3/0/23
    > >> VLAN0318 GigabitEthernet3/0/23
    > >> VLAN0320 GigabitEthernet3/0/23
    > >> VLAN0330 GigabitEthernet3/0/23
    > >> VLAN0400 GigabitEthernet3/0/23

    >
    > >> [sh spanning-tree summary.txt]sw-com1-be#sh spanning-tree summary
    > >> Switch is in pvst mode
    > >> Root bridge for: none
    > >> Extended system ID is enabled
    > >> Portfast Default is disabled
    > >> PortFast BPDU Guard Default is disabled
    > >> Portfast BPDU Filter Default is disabled
    > >> Loopguard Default is disabled
    > >> EtherChannel misconfig guard is enabled
    > >> UplinkFast is enabled
    > >> Stack port is StackPort1
    > >> BackboneFast is enabled
    > >> Configured Pathcost method used is short

    >
    > >> Name Blocking Listening Learning Forwarding STP Active
    > >> ---------------------- -------- --------- -------- ---------- ----------
    > >> VLAN0001 1 0 0 1 2
    > >> VLAN0002 1 0 0 1 2
    > >> VLAN0003 1 0 0 1 2
    > >> VLAN0018 1 0 0 1 2
    > >> VLAN0038 1 0 0 1 2
    > >> VLAN0048 1 0 0 1 2
    > >> VLAN0085 1 0 0 3 4
    > >> VLAN0216 1 0 0 1 2
    > >> VLAN0242 - 245 - 249 - 253 -1872756559 1012957184
    > >> VLAN0243 - 245 - 249 - 253 -1872756559 1012957184
    > >> VLAN0315 1 0 0 2 3
    > >> VLAN0316 1 0 0 1 2
    > >> VLAN0317 1 0 0 3 4
    > >> VLAN0318 1 0 0 2 3
    > >> VLAN0320 1 0 0 4 5
    > >> VLAN0330 1 0 0 1 2
    > >> VLAN0400 1 0 0 1 2
    > >> ---------------------- -------- --------- -------- ---------- ----------
    > >> 17 vlans - 475 - 498 - 506 549454202 2025914407

    >
    > >> Station update rate set to 150 packets/sec.

    >
    > >> UplinkFast statistics
    > >> -----------------------
    > >> Number of transitions via uplinkFast (all VLANs) : 0
    > >> Number of proxy multicast addresses transmitted (all VLANs) : 2404

    >
    > >> BackboneFast statistics
    > >> -----------------------
    > >> Number of transition via backboneFast (all VLANs) : 0
    > >> Number of inferior BPDUs received (all VLANs) : 10
    > >> Number of RLQ request PDUs received (all VLANs) : 20
    > >> Number of RLQ response PDUs received (all VLANs) : 0
    > >> Number of RLQ request PDUs sent (all VLANs) : 10
    > >> Number of RLQ response PDUs sent (all VLANs) : 0

    >
    > > Please post show vlan and show trunk (or equivalent in IOS, something
    > > like show interface switchport).

    >
    >
    >
    > [sh interfaces trunk.txt]sw-com1-be# sh interfaces trunk
    >
    > Port Mode Encapsulation Status Native vlan
    > Gi3/0/23 on 802.1q trunking 1
    > Gi3/0/24 on 802.1q trunking 1
    >
    > Port Vlans allowed on trunk
    > Gi3/0/23 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    > Gi3/0/24 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    >
    > Port Vlans allowed and active in management domain
    > Gi3/0/23 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    > Gi3/0/24 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    >
    > Port Vlans in spanning tree forwarding state and not pruned
    > Gi3/0/23 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    > Gi3/0/24 34,72,240-243,401-402


    Can you paste a show spantree 242 and show spantree 243? Were these
    created on this switch, or another switch in the stack? It looks like
    this is not the root for any vlan, and that your 0/23 and 0/24 are
    your trunk ports, and you also have a stack configuration. Your
    trunking is fine, but not sure why its preferring the stack as the
    root port, unless of course the other side of the 0/23 and 0/24 trunks
    is pruning 242 and 243?
     
    Trendkill, Feb 6, 2008
    #4
  5. Giuseppe

    Giuseppe Guest

    Re: strange STP behaviour : stack port in "sh spanning-tree" output

    Hi

    I found the problem ...

    Issuing "sh run" on the third switch i noticed that config between
    switch 1 and 3 are not completely aligned : on switch 3 there was a no
    spanning-tree vlan 242-243 ... I had to reconfigure "spanning-tree vlan
    242-243" on the master to align configs...

    What do you think ???

    Thanks a lot for your help ...

    Giuseppe


    Trendkill ha scritto:
    > On Feb 5, 12:43 pm, Giuseppe <> wrote:
    >> In attahach show interfaces trunk
    >>
    >> Thanks
    >>
    >> Giuseppe
    >>
    >> Trendkill ha scritto:
    >>
    >>> On Feb 5, 10:20 am, Giuseppe <> wrote:
    >>>> Hi All
    >>>> I have three 3750 switch connected in stack ...
    >>>> Issuing "sh spanning-tree root port" only for VLAN 242 and 243 you can
    >>>> see stack port 1 as root port ....
    >>>> This is quite stange ....
    >>>> Have you ever happened something like this???
    >>>> All works well but I cannot understand if this behaviour is correct...
    >>>> regards
    >>>> Giuseppe
    >>>> p.s. in attach two useful output...
    >>>> [sh spanning-tree root.txt]
    >>>> sw-com1-be#sh spanning-tree root port
    >>>> VLAN0001 GigabitEthernet3/0/23
    >>>> VLAN0002 GigabitEthernet3/0/23
    >>>> VLAN0003 GigabitEthernet3/0/23
    >>>> VLAN0018 GigabitEthernet3/0/23
    >>>> VLAN0038 GigabitEthernet3/0/23
    >>>> VLAN0048 GigabitEthernet3/0/23
    >>>> VLAN0085 GigabitEthernet3/0/23
    >>>> VLAN0216 GigabitEthernet3/0/23
    >>>> VLAN0242 StackPort1
    >>>> VLAN0243 StackPort1
    >>>> VLAN0315 GigabitEthernet3/0/23
    >>>> VLAN0316 GigabitEthernet3/0/23
    >>>> VLAN0317 GigabitEthernet3/0/23
    >>>> VLAN0318 GigabitEthernet3/0/23
    >>>> VLAN0320 GigabitEthernet3/0/23
    >>>> VLAN0330 GigabitEthernet3/0/23
    >>>> VLAN0400 GigabitEthernet3/0/23
    >>>> [sh spanning-tree summary.txt]sw-com1-be#sh spanning-tree summary
    >>>> Switch is in pvst mode
    >>>> Root bridge for: none
    >>>> Extended system ID is enabled
    >>>> Portfast Default is disabled
    >>>> PortFast BPDU Guard Default is disabled
    >>>> Portfast BPDU Filter Default is disabled
    >>>> Loopguard Default is disabled
    >>>> EtherChannel misconfig guard is enabled
    >>>> UplinkFast is enabled
    >>>> Stack port is StackPort1
    >>>> BackboneFast is enabled
    >>>> Configured Pathcost method used is short
    >>>> Name Blocking Listening Learning Forwarding STP Active
    >>>> ---------------------- -------- --------- -------- ---------- ----------
    >>>> VLAN0001 1 0 0 1 2
    >>>> VLAN0002 1 0 0 1 2
    >>>> VLAN0003 1 0 0 1 2
    >>>> VLAN0018 1 0 0 1 2
    >>>> VLAN0038 1 0 0 1 2
    >>>> VLAN0048 1 0 0 1 2
    >>>> VLAN0085 1 0 0 3 4
    >>>> VLAN0216 1 0 0 1 2
    >>>> VLAN0242 - 245 - 249 - 253 -1872756559 1012957184
    >>>> VLAN0243 - 245 - 249 - 253 -1872756559 1012957184
    >>>> VLAN0315 1 0 0 2 3
    >>>> VLAN0316 1 0 0 1 2
    >>>> VLAN0317 1 0 0 3 4
    >>>> VLAN0318 1 0 0 2 3
    >>>> VLAN0320 1 0 0 4 5
    >>>> VLAN0330 1 0 0 1 2
    >>>> VLAN0400 1 0 0 1 2
    >>>> ---------------------- -------- --------- -------- ---------- ----------
    >>>> 17 vlans - 475 - 498 - 506 549454202 2025914407
    >>>> Station update rate set to 150 packets/sec.
    >>>> UplinkFast statistics
    >>>> -----------------------
    >>>> Number of transitions via uplinkFast (all VLANs) : 0
    >>>> Number of proxy multicast addresses transmitted (all VLANs) : 2404
    >>>> BackboneFast statistics
    >>>> -----------------------
    >>>> Number of transition via backboneFast (all VLANs) : 0
    >>>> Number of inferior BPDUs received (all VLANs) : 10
    >>>> Number of RLQ request PDUs received (all VLANs) : 20
    >>>> Number of RLQ response PDUs received (all VLANs) : 0
    >>>> Number of RLQ request PDUs sent (all VLANs) : 10
    >>>> Number of RLQ response PDUs sent (all VLANs) : 0
    >>> Please post show vlan and show trunk (or equivalent in IOS, something
    >>> like show interface switchport).

    >>
    >>
    >> [sh interfaces trunk.txt]sw-com1-be# sh interfaces trunk
    >>
    >> Port Mode Encapsulation Status Native vlan
    >> Gi3/0/23 on 802.1q trunking 1
    >> Gi3/0/24 on 802.1q trunking 1
    >>
    >> Port Vlans allowed on trunk
    >> Gi3/0/23 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    >> Gi3/0/24 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    >>
    >> Port Vlans allowed and active in management domain
    >> Gi3/0/23 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    >> Gi3/0/24 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    >>
    >> Port Vlans in spanning tree forwarding state and not pruned
    >> Gi3/0/23 1-3,18,34,38,48,72,85,216,240-243,315-318,320,330,400-402
    >> Gi3/0/24 34,72,240-243,401-402

    >
    > Can you paste a show spantree 242 and show spantree 243? Were these
    > created on this switch, or another switch in the stack? It looks like
    > this is not the root for any vlan, and that your 0/23 and 0/24 are
    > your trunk ports, and you also have a stack configuration. Your
    > trunking is fine, but not sure why its preferring the stack as the
    > root port, unless of course the other side of the 0/23 and 0/24 trunks
    > is pruning 242 and 243?
     
    Giuseppe, Feb 6, 2008
    #5
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