No Spanning-Tree Vlan # on C2950

Hello everyone,
I've recently found that one of the switches on my network (which I never set up) is running a "no spanning-tree vlan 3, 5, 10" command, which I want to remove, but I have been unable to. When I do try and type in "spanning-tree vlan 3" nothing comes up, but when I show spanning tree it lets me know that it doesn't exist.
Is there a command I'm missing? (It's a larger number of vlans)
Thanks in advance,
David

I'm not sure there would be anything for spanning tree to calculate if no ports on the switch are assigned to vlan 3.  Try assigning an unused port to vlan 3 and see if your output of sh spanning-tree vlan 3 changes.

Similar Messages

  • Sh spanning-tree vlan

    Hello,
    When we type "sh spanning-tree vlan X detail", then we have :
    - Number of topology changes : Y
    - Times.... topology changes : Z
    - Timers... topology changes : T
    Is Y the number fo TC in vlan X ?
    Is Z the number of TC in all vlans ?
    What about T ?
    Thanks,
    Navid

    I think T is Y the no. of Tc in VLAN X.

  • Spanning-tree vlan 1002-1005

    Hi,
    I have noticed that two of my switches has "spanning-tree vlan 1002-1005" in my running configuration. Since we are not using those vlans, I was thinking of removing it from our running configuration by doing "no spanning-tree vlan 1002-1005". Is that possible? Would there be any issues should I remove it?

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    When you do a "show vlan 1002" on those switches, do you see any active ports? NOte that some switches allow you to clear these VLANs from a trunk, and some do not.
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    Luxembourg

  • Spanning Tree VLAN Priority Issue

    We have two 6500E switches and running spanning tree with rapid-pvst.We have also configured per vlan spanning tree priority with 100,200 so odd vlan have one switch hight priority and even vlans have  another switch high priority.
    I have created new vlan 10 and tring to add spanning tree priority to the switches i am getting the following error
    Core-switch(config)#spanning-tree vlan 10  priority 100
    % Bridge Priority must be in increments of 4096.
    % Allowed values are:
      0     4096  8192  12288 16384 20480 24576 28672
      32768 36864 40960 45056 49152 53248 57344 61440
    Can some experts help me why i am getting the above message and how can i add the priority to the same as existing vlans

    Hi ,
     Spanning tree priority can be set in increment of 4096 , any other values will be rejected . if you want to know about priority value of existing vlan execute command show spanning-tree vlan X / show spanning-tree command which will show you switch priority value 
    Step 2 
    spanning-tree vlan vlan-idpriority priority
    Configure the switch priority of a VLAN.
    •For vlan-id, you can specify a single VLAN identified by VLAN ID number, a range of VLANs separated by a hyphen, or a series of VLANs separated by a comma. The range is 1 to 4094.
    •For priority, the range is 0 to 61440 in increments of 4096; the default is 32768. The lower the number, the more likely the switch will be chosen as the root switch.
    Valid priority values are 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, and 61440. All other values are rejected.
    HTH
    Sandy

  • Span Tree Vlan with VTP

    I have 2 cisco c2950 switches, I have 2 problems:
    1- I can't create more than 1001 vlan..(I have configured the both switches with vtp transparent mode).
    2- when I issue the command (sh vtp status), I noticed that vlans supported locally 64 & number of existing vlans are 63.
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    Hi Friend,
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    http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/12119ea1/2950scg/swvlan.htm#1092283
    HTH, if yes please rate the post.
    Ankur

  • Spanning tree - balanced without use vlan ?

    Hi, i´m sorry if this is a classic question.
     i have implemented rapid pvst like show in the image. The dotted lines are the alternative links. (image 1)
    SwitchA# spanning-tree vlan 1 root primary
    SwitchB# spanning-tree vlan 1 root secondary
    I want to make a kind of balancing like image 2. But the problem is that i have vlan 100 (and other vlans) in side A and Side B.
      So, if i make 
    SwitchB: spanning-tree vlan 100 root primary
    SwitchA: spanning-tree vlan 100 root secondary
      The SwB it change to primary for vlan 100. 
      But i want to the switchB be the primary for side A and secondary for side A. No matter the vlan. Is possible?
    Thanks a lot!
    IMAGE 1
    IMAGE 2
    PS: Later i will implement HSRP.

      Hi, i know that is possible, but doing this the result is unbalanced for mi network. For example vlan 20 reside in all switches and vlan 21 reside in only one switch. 
      i want to the switchA be the primary for side A and secondary for side B. No matter the vlan. Like image 2.
      I hope to be clear.
    Thanks.

  • The spanning-tree add strange value when I create new Vlans

    Hi,
    On all switchs access, the spanning-tree add strange value when I create new Vlans from Distrib Layer,
    and no association is created with any interface with spanning-tree vlan 700, see below in this exemple,
    until I reboot the switch.
    somebody already saw this values ?
    DSFDS112#sh span sum
    Switch is in rapid-pvst mode
    Root bridge for: none
    EtherChannel misconfig guard is enabled
    Extended system ID           is enabled
    Portfast Default             is disabled
    PortFast BPDU Guard Default  is disabled
    Portfast BPDU Filter Default is disabled
    Loopguard Default            is enabled
    UplinkFast                   is disabled
    Stack port is StackPort1
    BackboneFast                 is disabled
    Configured Pathcost method used is long
    Name                   Blocking Listening Learning Forwarding STP Active
    VLAN0001                     0         0        0          3          3
    VLAN0002                     0         0        0         22         22
    VLAN0006                     0         0        0          3          3
    VLAN0007                     0         0        0          8          8
    VLAN0009                     0         0        0          4          4
    VLAN0010                     0         0        0          3          3
    VLAN0011                     0         0        0          3          3
    VLAN0012                     0         0        0          3          3
    VLAN0013                     0         0        0          3          3
    VLAN0090                     0         0        0         15         15
    VLAN0109                     0         0        0          3          3
    VLAN0200                     0         0        0          4          4
    VLAN0300                     0         0        0         26         26
    VLAN0302                     0         0        0          4          4
    VLAN0700               -   253  -1872756560  2087191206  -1872756549  2080375982
    VLAN0702               -   253  -1872756560  2087191206  -1872756549  2080375982
    VLAN0704                     0         0        0          4          4
    VLAN0710               -   253  -1872756560  2087191206  -1872756549  2080375982
    VLAN0816                     0         0        0          3          3
    VLAN0820                     0         0        0          3          3
    20 vlans               -   759  -1323302384  1966606322  -1323302237  1946160764
    DSFDS112#sh span vlan 700
    VLAN0700
      Spanning tree enabled protocol rstp
      Root ID    Priority    4796
                 Address     0008.e3ff.fcbc
                 Cost        10000
                 Port        608 (Port-channel1)
                 Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
      Bridge ID  Priority    62140  (priority 61440 sys-id-ext 700)
                 Address     885a.9213.6880
                 Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
                 Aging Time  300 sec
    Interface           Role Sts Cost      Prio.Nbr Type
    Po1                Root FWD 10000     128.608  P2p
    DSFDS112#sh run int Gi1/0/25
    Building configuration...
    Current configuration : 194 bytes
    interface GigabitEthernet1/0/25
     description Station12
     switchport access vlan 700
     switchport mode access
    end
    DSFDS112#sh span interface Gi1/0/25
    no spanning tree info available for GigabitEthernet1/0/25
    DSFDS112#sh int status interface Gi1/0/25
    Port      Name               Status       Vlan       Duplex  Speed Type
    Gi1/0/25  Station12          connected    700          full    100 10/100/1000BaseTX
    Thanks for your help,
    Regards.

    Venki,
    The ORA-00942 is okay because there is no existing object. But what stuck me is the ORA-01921 error which may indicate that this might not be a new database.
    CREATE ROLE exp_full_database
    ERROR at line 1:
    ORA-01921: role name 'EXP_FULL_DATABASE' conflicts with another user or role name
    CREATE ROLE imp_full_database
    ERROR at line 1:
    ORA-01921: role name 'IMP_FULL_DATABASE' conflicts with another user or role name
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    Ittichai

  • Cisco Noob - Layer 3 Routing / VLAN / Spanning Tree

    Hi All ...
    I need some pointers on which commands / settings and where, I know what I want to achieve but the things I am trying seem to be 'mutually exclusive' - either that or i'm missing something - I am not a Cisco IOS expert but I know my way around a network.
    Take 3 3560 switches in Layer 3 mode, there is a 'local' fibre spanning tree ring serving mulriple switches on each, each ring is it's own IP segment / VLAN. There is then a trunk between each switch on which I want to establish a load sharing / spanning tree circuit i.e.
    SW1 hosts VLAN 2 via copper on fa0/1 -12, ip address 10.10.2.254
    SW1 hosts VLAN 3 via a fibre spanning tree circuit on G0/1 & G0/2, dhcp 10.10.3.0/24, trunk 1 on G0/3 and trunk 2 on G0/4
    SW1 hosts VLAN 10, ip address 10.10.10.1 (trunks 1 and 2 have no IP address but are members of VLAN 10)
    SW2 hosts VLAN 4 via a fibre spanning tree circuit on G0/1 & G0/2, dhcp 10.10.4.0/24, trunk 1 on G0/3 and trunk 2 on G0/4
    SW2 hosts VLAN 10, ip address 10.10.10.2 (trunks 1 and 2 have no IP address but are members of VLAN 10)
    SW3 hosts VLAN 5 via a fibre spanning tree circuit on G0/1 & G0/2, dhcp 10.10.5.0/24, trunk 1 on G0/3 and trunk 2 on G0/4
    SW3 hosts VLAN 10, ip address 10.10.10.3 (trunks 1 and 2 have no IP address but are members of VLAN 10)
    SW1 G0/3 is a SMF trunk to SW2 G0/3
    SW1 G0/4 is a SMF trunk to SW3 G0/3
    SW2 G0/4 is a SMF trunk to SW3 G0/4
    The trunks are configured as "trunk encapsulation dot1q", ip routing is  enabled.
    I can get the trunks working OK - but I can't seem to get routing to work across them - if I define an interface on SW1 with an IP set in SW3 the switch complains so it can clearly see it so which command have I missed.
    All VLAN's are part of the same domain, each VLAN has it's own DHCP hosted on it's hosting switch. The VLAN ip address is excluded from DHCP and is the default gateway for each VLAN.
    All VLAN's must be able to reach VLAN2 (contains SQL servers and DNS, Time etc etc), the VLAN's are working, DHCP etc is all working - but I can't get anything other than VLAN 10 IP's to talk across the trunks - I've tried adding spanning-tree vlan 2,3,4,5,10 but this hasn't worked, the ip route-map shows nothing, if you show spanning-tree the trunk ports do show up as an interface for all VLAN's - and yet no traffic passes across them - show route displays nothing. I tried adding ip route 10.10.*.0 255.255.255.0 10.10.2.254 (where 10.10.2.254 is the ip address of VLAN 2) but that's done nothing.
    I have tried various combinations - unsuccessful so far - I need the trunks to be not only fault tolerant but load sharing which kind of negates fixing IP's on them - or does it ?? - what am I missing ?
    (switches are all running IP services IOS)

    Hi John ,, here is the sh ip route and sh ip eigrp from all three.
    The ip address I'm trying to reach from SW1, SW2 is 10.10.2.253 - the DNS server - the server is available and connected to a copper port designated and assigned to VLAN 2 (which has the root ip of 10.10.2.254) dhcp is not enabled for VLAN 2.
    I can ping the DNS box from VLAN 5 (same switch as VLAN 2).
    The copper ports on the SW1 and SW2 boxes refuse to 'come up' - they remain shutdown no matter what. I haven't yet configured VLAN 10 ....
    (NOTE - these switches are on the bench right now - I intend to ge tthe config sorted / tested and verified before they go into production)
    SWITCH 1 - Host for VLAN 3 and 10
    SW1#sh ip route
    Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route
    Gateway of last resort is not set
         10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
    D       10.10.2.0/24 [90/3072] via 10.10.10.6, 01:19:29, GigabitEthernet0/2
    C       10.10.10.0/30 is directly connected, GigabitEthernet0/1
    C       10.10.10.4/30 is directly connected, GigabitEthernet0/2
    SW1#sh ip eigrp interfaces
    EIGRP-IPv4:(10) interfaces for process 10
                            Xmit Queue   Mean   Pacing Time   Multicast    Pending
    Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
    Gi0/2              1        0/0         1       0/1            0           0
    Vl3                0        0/0         0       0/1            0           0
    SW1#
    SWITCH 2 - Host for VLAN 4 and 10
    SW2#sh ip route
    Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route
    Gateway of last resort is not set
         10.0.0.0/30 is subnetted, 2 subnets
    C       10.10.10.8 is directly connected, GigabitEthernet0/1
    C       10.10.10.0 is directly connected, GigabitEthernet0/2
    SW2#sh ip eigrp interfaces
    EIGRP-IPv4:(10) interfaces for process 10
                            Xmit Queue   Mean   Pacing Time   Multicast    Pending
    Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
    Gi0/2              0        0/0         0       0/1            0           0
    Gi0/1              0        0/0         0       0/1            0           0
    Vl4                0        0/0         0       0/1            0           0
    SW2#
    SWITCH 3 - Host for VLAN 2, 5 and 10
    SW3#sh ip route
    Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route
    Gateway of last resort is not set
         10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
    C       10.10.10.8/30 is directly connected, GigabitEthernet0/1
    C       10.10.2.0/24 is directly connected, Vlan2
    C       10.10.10.4/30 is directly connected, GigabitEthernet0/2
    SW3#sh ip eigrp interfaces
    EIGRP-IPv4:(5) interfaces for process 5
                            Xmit Queue   Mean   Pacing Time   Multicast    Pending
    Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
    Vl2                0        0/0         0       0/1            0           0
    Vl5                0        0/0         0       0/1            0           0
    EIGRP-IPv4(0)(0) interfaces for process 0
                            Xmit Queue   Mean   Pacing Time   Multicast    Pending
    Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
    EIGRP-IPv4:(10) interfaces for process 10
                            Xmit Queue   Mean   Pacing Time   Multicast    Pending
    Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
    Gi0/2              1        0/0         1       0/1           50           0
    Vl5                0        0/0         0       0/1            0           0
    Vl2                0        0/0         0       0/1            0           0
    SW3#
    SW3#show vlan
    VLAN Name                             Status    Ports
    1    default                          active   
    2    SERVERS                          active    Fa0/13, Fa0/14, Fa0/15, Fa0/16
                                                    Fa0/17, Fa0/18, Fa0/19, Fa0/20
    4    DB5-LAN                          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
                                                    Gi0/1, Gi/2
    10   MANAGER                          active    Fa0/21, Fa0/22, Fa0/23, Fa0/24
    1002 fddi-default                     act/unsup
    1003 token-ring-default               act/unsup
    1004 fddinet-default                  act/unsup
    1005 trnet-default                    act/unsup
    VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
    1    enet  100001     1500  -      -      -        -    -        0      0  
    2    enet  100002     1500  -      -      -        -    -        0      0  
    3    enet  100003     1500  -      -      -        -    -        0      0  
    4    enet  100004     1500  -      -      -        -    -        0      0  
    5    enet  100005     1500  -      -      -        -    -        0      0  
    10   enet  100010     1500  -      -      -        -    -        0      0  
    1002 fddi  101002     1500  -      -      -        -    -        0      0  
    1003 tr    101003     1500  -      -      -        -    srb      0      0  
    1004 fdnet 101004     1500  -      -      -        ieee -        0      0  
    1005 trnet 101005     1500  -      -      -        ibm  -        0      0  
    Remote SPAN VLANs
    Primary Secondary Type              Ports
    PPS : I'm using ports Gi0/1 and Gi0/2 for now - I removed these from DB5-LAN and can now 'ping' from SW1 but not from SW2 - but the local copper is still dead on SW1 and SW2
    Copper channels not dead - faulty patch lead ... the simplest things ....

  • VLAN spanning-tree root and VLAN L3 SVI

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    interface Vlan196
    description Tower I - 8th Floor VLAN
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    ip helper-address 172.20.135.201
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    I0504506A8#sh spanning-tree vlan 196
    VLAN0196
      Spanning tree enabled protocol ieee
      Root ID    Priority    196
                 Address     6400.f1ee.c140
                 Cost        4
                 Port        1 (GigabitEthernet1/1)
                 Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
      Bridge ID  Priority    49348  (priority 49152 sys-id-ext 196)
                 Address     0015.f960.9ac0
                 Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
                 Aging Time 300
    Interface        Role Sts Cost      Prio.Nbr Type
    Gi1/1            Root FWD 4         128.1    P2p
    Gi1/2            Altn BLK 4         128.2    P2p

    Hi Tojackson, I guess this depends on how stuff is interconnecting. It's obvious gi1/1 is forwarding and gi1/2 is blocking. So from the furthest access switch, what path must it take to reach gi1/1? That is the number of hops involved for normal traffic.
    Now, if you're concerned about a specific VLAN and you need gi1/2 forwarding to reduce travel time for other traffic, you may employ RPVST to have that specific VLAN and cost to go to gi1/2.
    In some part of the network I support we have a pair of Cisco 7606 which feeds in to a 4507R and off the 4507R we have a ring of 2955 with even 10-12 L2 switches on the ring. The consequence of multiple layer 2 hops is not of much concern and our spanning tree stops with the 4507 since we're not concerned about broadcast storm on the routed interfaces on the 7600.
    -Tom
    Please mark answered for helpful posts

  • "Peer-switch" command on vPC domain and spanning-tree priority interaction

    Hi guy,
    We have 2 N7K (N7KA and N7KB) which will be running vPC in hybird and pure vPC environment.
    I have a question about the Hybird and pure vPC environment. With the "peer-switch" command enable, should i tune the spanning-tree priority to be the same for all the vlan running on vPC on both N7KA and N7KB? This way, when i enter the "sh spanning-tree vlan X(vPC vlan) detail" command on N7K, it will list both N7K announc itself as "We are the root of the spanning tree".Also the switch running spanning-tree with N7K vPC vlan (Hybird), will see both N7K has the same priority (4096), and it is not desirable for a spanning-tree environment. Therefore, i used the "spanning-tree pseudo-information" on N7KB to tune the spanning-tree priority to "8192" and the switch running spanning-tree with N7K will list N7KB has a priority of 8192(perfect).
    However, I notice some strange "show" output on the switch running Port-channel with the N7KA and N7KB. The "Designated bridge" priority is flapping as show on the switch. It is constantly changing between "4096 and 8192" with the same vPC system wide mac address.
    Entering the "sh spanning-tree vlan X detail" command repeatly on switch with port-channel toward N7KA and N7KB.
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    Designated root has priority 4106, address 0013.05ee.bac8
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    Designated port id is 144.2999, designated path cost 0
    Timers: message age 15, forward delay 0, hold 0
    Number of transitions to forwarding state: 1
    Link type is point-to-point by default
    BPDU: sent 5, received 603
    one sec later.
    >>sh spanning-tree vlan 10 detail
    Port 65 (Port-channel1) of VLAN10 is root forwarding Port path cost 3, Port priority 128, Port Identifier 128.65. Designated root has priority 4106, address 0013.05ee.bac8 Designated bridge has priority 8202, address 0013.05ee.bac8 Designated port id is 144.2999, designated path cost 0 Timers: message age 15, forward delay 0, hold 0 Number of transitions to forwarding state: 1 Link type is point-to-point by default BPDU: sent 5, received 603
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    N7KA
    spanning-tree vlan 1-10 priority 4096
    vpc domain 200
    peer-switch
    N7KB
    spanning-tree vlan 1-10 priority 4096spanning-tree pseudo-information vlan 1-10 designated priority 8192
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  • Nexus spanning tree pseudo configuration

    Hi
    I am trying to understand the pseudo configuration commands in a Nexus hybrid topology.
    I have vlans a, b and c only in the vPC side of the topology.  I have peer switch configured and the same stp priority on both switches.
    In the standard Spaning-tree topology I have completely seperate vlans x, y and z.
    What should I be configuring in the pseudo config section ?  Do I define a pseudo root priority for all vlans a, b, c and x, y, z or just for the standard spanning tree vlans x, y and z.  I need to avoid and, even short, spanning tree outages if I take one Nexus out of service for a short time.
    My thinking is that if one Nexus is out of service the physical mac will be used and potentially reduce the root priority of the vPC vlans causing a TCN and STP recalculation in vlans a, b and c.  This can be avoided by configuring a pseudo root priority for all Vlans lower than the current spanning tree priority shared by the vPC peers.  Is this correct ?  However, since I have a shared priority of 8192 on current vPC vlans will configuring, for example, a pseudo root priority of 4096 on those vPC vlans won't this also cause the TCN and recalculation I am trying to avoid ?  Is the benefit of the pseudo root config only obtained if it is configured at the start when the vPC is formed and prior to the peer switch command being issued ?
    Thanks, Stuart.

    Hi Ajay,
    It is recommended that switch-to-switch links are configured with the spanning-tree port type normalcommand. The one exception is the vPC peer-link which is recommended to configure with the spanning-tree port type network command.
    Take a read of the Best Practices for Spanning Tree Protocol Interoperability from page 56 of the vPC Best Practice Design Guide for further information on this.
    Regards

  • Rapid Spanning Tree Problem

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    I would need to know some things to troubleshoot this:
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    2. I presume VLAN 1 is in the allowed VLANs list on both sides of the link?
    3. If the native VLAN is not 1, is the native VLAN allowed on the trunk, on both sides?
    4. What model of switch is it, and what version of the software?
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    Kevin Dorrell
    Luxembourg

  • Spanning tree question

    I want to change the spanning tree root on several vlans on my network. My question is, will this cause STP to recalculate for the entire network, which can cause the network to slow down or will it only affect the vlans that I am changing? I want to make sure I am not going to impact anything on the network.

    When executed properly, this will only affect the vlans that you wish to change. Use the folllowing command to change spanning tree prio on a vlan:
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    Regards,
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  • Spanning Tree Config Question

    What is the difference between using the following 2 command to gaurentee a certain switch as the root switch? Can I use either one? Is one way more beneficial than the other?
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    There is more to the "root primary" command that just setting the priority. The root command is in fact a macro that configures the priority but also the spanning-tree timers (by macro I mean that this command is in fact expanded into several different configuration lines, one of them being the stp priority. The macro is not showing up in the configuration). This is particularly interesting if you want to adjust your timers based on the diameter of your network in PVST mode.
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    Regards,
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  • Spanning-tree not working: SG500 to Cat3650

    Hi All,
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    Configs below:
    Core 3650: (box configs basically)
    Switch#show run
    Building configuration...
    Current configuration : 2686 bytes
    ! Last configuration change at 10:01:53 UTC Thu Jan 22 2015
    ! NVRAM config last updated at 09:24:03 UTC Thu Jan 22 2015
    version 15.0
    no service pad
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    service compress-config
    hostname Switch
    boot-start-marker
    boot-end-marker
    vrf definition Mgmt-vrf
     address-family ipv4
     exit-address-family
     address-family ipv6
     exit-address-family
    logging console emergencies
    enable secret 5 $1$Qi5N$u/5q1HESY/TyQsPFNKVah1
    no aaa new-model
    clock timezone UTC -6 0
    clock summer-time UTC recurring
    switch 1 provision ws-c3650-24ts
    ip device tracking
    diagnostic bootup level minimal
    spanning-tree mode pvst
    spanning-tree extend system-id
    spanning-tree vlan 1 priority 24576
    redundancy
     mode sso
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        bandwidth remaining ratio 10
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     no ip address
     negotiation auto
    interface GigabitEthernet1/0/1
    interface GigabitEthernet1/0/2
    interface GigabitEthernet1/0/3
    interface GigabitEthernet1/0/4
    interface GigabitEthernet1/0/5
    interface GigabitEthernet1/0/6
    interface GigabitEthernet1/0/7
    interface GigabitEthernet1/0/8
    interface GigabitEthernet1/0/9
    interface GigabitEthernet1/0/10
    interface GigabitEthernet1/0/11
    interface GigabitEthernet1/0/12
    interface GigabitEthernet1/0/13
    interface GigabitEthernet1/0/14
    interface GigabitEthernet1/0/15
    interface GigabitEthernet1/0/16
    interface GigabitEthernet1/0/17
    interface GigabitEthernet1/0/18
    interface GigabitEthernet1/0/19
    interface GigabitEthernet1/0/20
    interface GigabitEthernet1/0/21
    interface GigabitEthernet1/0/22
    interface GigabitEthernet1/0/23
    interface GigabitEthernet1/0/24
    interface GigabitEthernet1/1/1
    interface GigabitEthernet1/1/2
    interface GigabitEthernet1/1/3
    interface GigabitEthernet1/1/4
    interface Vlan1
     ip address 192.168.5.230 255.255.255.0
    ip default-gateway 192.168.5.1
    ip http server
    ip http secure-server
    line con 0
     exec-timeout 0 0
     stopbits 1
    line aux 0
    line vty 0 4
     password scrubbed
     login
    line vty 5 15
     password scrubbed
     login
    wsma agent exec
     profile httplistener
     profile httpslistener
    wsma agent config
     profile httplistener
     profile httpslistener
    wsma agent filesys
     profile httplistener
     profile httpslistener
    wsma agent notify
     profile httplistener
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    wsma profile listener httplistener
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    ap group default-group
    end
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    switchff1182#show run
    config-file-header
    switchff1182
    v1.3.0.62 / R750_NIK_1_3_647_260
    CLI v1.0
    set system mode switch queues-mode 4
    file SSD indicator encrypted
    ssd-control-start
    ssd config
    ssd file passphrase control unrestricted
    no ssd file integrity control
    ssd-control-end cb0a3fdb1f3a1af4e4430033719968c0
    voice vlan oui-table add 0001e3 Siemens_AG_phone________
    voice vlan oui-table add 00036b Cisco_phone_____________
    voice vlan oui-table add 00096e Avaya___________________
    voice vlan oui-table add 000fe2 H3C_Aolynk______________
    voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
    voice vlan oui-table add 00d01e Pingtel_phone___________
    voice vlan oui-table add 00e075 Polycom/Veritel_phone___
    voice vlan oui-table add 00e0bb 3Com_phone______________
    hostname switchff1182
    no passwords complexity enable
    username cisco password encrypted scrubbed privilege 15
    ip ssh server
    snmp-server server
    no ip http server
    ip telnet server
    interface vlan 1
     ip address 192.168.5.231 255.255.255.0
     no ip address dhcp
    exit
    ip default-gateway 192.168.5.1

    Hi Peter,
    Thanks for replying. Unfortunately (or fortunately if it worked), STP is running and BPDU's are flooding below:
    SW500A#show spanning-tree
    Spanning tree enabled mode RSTP
    Default port cost method:  long
      Root ID    Priority    24577
                 Address     a0:ec:f9:ef:6a:00
                 Cost        20000
                 Port        gi1/1/43
                 Hello Time  2 sec  Max Age 20 sec  Forward Delay 15 sec
      Bridge ID  Priority    32768
                 Address     2c:3e:cf:ff:11:82
                 Hello Time  2 sec  Max Age 20 sec  Forward Delay 15 sec
    SW500A#show spanning-tree bpdu
    Global: Flooding
    I guess I'm doing etherchannels instead of redundant links :-/
    This is one of many reasons why I regret these small business models being made; A lot of things that are polished and functional in the enterprise grade (i.e. real switches) just don't seem to work on these units. But unfortunately, as the price is significantly cheaper, companies will continue purchasing these over the better quality units, and engineers like myself will be stuck working with the cut-corners version of a Cisco switch.

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