[c-nsp] STP active/listed on wrong port

"Rolf Hanßen" nsp at rhanssen.de
Wed Mar 13 05:13:40 EDT 2013


Hello,

maybe just a bug I found, shutting down the port and re-enabling it
"solves" it:

edge1-dus3#sh spanning-tree

No spanning tree instance exists.

edge1-dus3#

kind regards
Rolf


> Hello,
>
> I would also guess somthing in that direction if it was
> general/reproduceble behaviour, but why does that happen only on this port
> ?
> I have lots of ports with similar config (mode trunk, everything tagged)
> on several boxes and this is the only one listed in "show spanning-tree".
>
> Config samples:
>
> interface GigabitEthernet7/2
>  switchport
>  switchport trunk encapsulation dot1q
>  switchport trunk allowed vlan 666,1153
>  switchport mode trunk
>  load-interval 30
> end
>
> interface GigabitEthernet7/16
>  description custsw2-dus1 A16
>  switchport
>  switchport trunk encapsulation dot1q
>  switchport trunk allowed vlan 1253,1606
>  switchport mode trunk
>  mtu 9216
>  load-interval 30
> end
>
> interface TenGigabitEthernet8/2
>  switchport
>  switchport trunk encapsulation dot1q
>  switchport trunk allowed vlan 1122,1142,1293,1421,1429,1476,3404,3405
>  switchport trunk allowed vlan add 3408-3410
>  switchport mode trunk
>  mtu 9216
>  load-interval 30
> end
>
> Only 7/16 is listed and there is nothing on the config beside the above as
> far as I see:
>
> edge1-dus3#sh running-config | inc 7/16
> interface GigabitEthernet7/16
> edge1-dus3#
>
> kind regards
> Rolf
>
>> You're using 802.1q, which uses an untagged native VLAN for things like
>> STP
>> BPDUs, CDP, VTP, etc ,etc.  Even though you pruned off VLAN 1 via the
>> allowed VLANs command, the native VLAN will still be used for
>> switch-generated protocols like those listed above.  Only
>> transit-traffic
>> is
>> denied by pruning.  If you change the native VLAN to something other
>> than
>> one (do it on both sides, or wacky/painful things can happen), you
>> should
>> see VLAN 1 no longer on that port.
>>
>> Chuck
>>
>> -----Original Message-----
>> From: cisco-nsp-bounces at puck.nether.net
>> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of "Rolf Hanßen"
>> Sent: Tuesday, March 12, 2013 1:34 PM
>> To: cisco-nsp at puck.nether.net
>> Subject: [c-nsp] STP active/listed on wrong port
>>
>> Hello list,
>>
>> do you have an explanation why STP thinks Gi7/16 belongs to vlan 1 ?
>>
>> edge1-dus3#sh spanning-tree
>>
>> VLAN0001
>>   Spanning tree enabled protocol ieee
>>   Root ID    Priority    32769
>>              Address     5475.d0a6.75c0
>>              This bridge is the root
>>              Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
>>
>>   Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
>>              Address     5475.d0a6.75c0
>>              Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
>>              Aging Time 300
>>
>> Interface           Role Sts Cost      Prio.Nbr Type
>> ------------------- ---- --- --------- --------
>> --------------------------------
>> Gi7/16              Desg FWD 4         128.1552 P2p
>>
>>
>> Interface Config:
>> interface GigabitEthernet7/16
>>  description custsw2-dus1 A16
>>  switchport
>>  switchport trunk encapsulation dot1q
>>  switchport trunk allowed vlan 1253,1606  switchport mode trunk  mtu
>> 9216
>> load-interval 30 end
>>
>> STP is disabled on all other vlans:
>> no spanning-tree vlan 2-4000
>>
>> Gi7/16 is not listed here:
>>
>> edge1-dus3#sh vlan id 1
>>
>> VLAN Name                             Status    Ports
>> ---- -------------------------------- ---------
>> -------------------------------
>> 1    default                          active    Gi1/5, Gi1/8, Gi1/13,
>> Gi1/25, Gi1/27, Gi1/48, Te4/1, Gi6/1, Gi7/1, Gi7/3, Gi7/4, Gi7/5, Gi7/6,
>> Gi7/7, Gi7/8, Gi7/9, Gi7/10, Gi7/11, Gi7/12, Gi7/13, Gi7/14, Gi7/15,
>> Gi7/17,
>> Gi7/18, Gi7/19
>>                                                 Gi7/20, Gi7/21, Gi7/22,
>> Gi7/23, Gi7/24
>>
>> VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1
>> Trans2
>> ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------
>> ------
>> 1    enet  100001     1500  -      -      -        -    -        0
>> 0
>>
>> Remote SPAN VLAN
>> ----------------
>> Disabled
>>
>> Primary Secondary Type              Ports
>> ------- --------- -----------------
>> ------------------------------------------
>>
>>
>> Port is up and works fine:
>>
>> edge1-dus3#sh int Gi7/16
>> GigabitEthernet7/16 is up, line protocol is up (connected)
>>   Hardware is C6k 1000Mb 802.3, address is 001d.a246.3743 (bia
>> 001d.a246.3743)
>>   Description: custsw2-dus1 A16
>>   MTU 9216 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
>>      reliability 255/255, txload 6/255, rxload 6/255
>>   Encapsulation ARPA, loopback not set
>>   Keepalive set (10 sec)
>>   Full-duplex, 1000Mb/s, media type is LX
>>   input flow-control is off, output flow-control is off
>>   Clock mode is auto
>>   ARP type: ARPA, ARP Timeout 04:00:00
>>   Last input 00:00:00, output never, output hang never
>>   Last clearing of "show interface" counters never
>>   Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops:
>> 0
>>   Queueing strategy: fifo
>>   Output queue: 0/40 (size/max)
>>   30 second input rate 27117000 bits/sec, 3517 packets/sec
>>   30 second output rate 24383000 bits/sec, 2860 packets/sec
>>      32078138057 packets input, 32998390284372 bytes, 0 no buffer
>>      Received 524965 broadcasts (173874 multicasts)
>>      0 runts, 0 giants, 0 throttles
>>      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
>>      0 watchdog, 0 multicast, 0 pause input
>>      0 input packets with dribble condition detected
>>      13839785752 packets output, 9991981200426 bytes, 0 underruns
>>      0 output errors, 0 collisions, 3 interface resets
>>      0 unknown protocol drops
>>      0 babbles, 0 late collision, 0 deferred
>>      0 lost carrier, 0 no carrier, 0 pause output
>>      0 output buffer failures, 0 output buffers swapped out
>>
>>
>> edge1-dus3#sh version
>> Cisco IOS Software, c7600s72033_rp Software
>> (c7600s72033_rp-ADVIPSERVICESK9-M), Version 15.1(2)S, RELEASE SOFTWARE
>> (fc1)
>>
>> Hardware is Cisco 7609-S, Sub720-3BXL, Slot 7 is a WS-X6724-SFP
>>
>> kind regards
>> Rolf Hanßen
>>
>>
>>
>> _______________________________________________
>> cisco-nsp mailing list  cisco-nsp at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/cisco-nsp
>> archive at http://puck.nether.net/pipermail/cisco-nsp/
>>
>>
>
>
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>




More information about the cisco-nsp mailing list