06-20-2003 12:08 AM - edited 03-02-2019 08:17 AM
Hi,
does anyone have a 2950 with Ios c2950-i6q4l2-mz.121-13.EA1b.bin on it ?
If i try to change the spannig tree priority accept all the value except one .
The command spanning-tree vlan 1 priority 32768 will instead set priority as 49152 !
Thanks,
Patrizio
06-20-2003 05:31 AM
Hey there
I don't have the same problem.. I just did a lab recreate:
Switch#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(13)EA1b, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Tue 15-Apr-03 12:25 by yenanh
Image text-base: 0x80010000, data-base: 0x805A8000
ROM: Bootstrap program is CALHOUN boot loader
Switch uptime is 2 minutes
System returned to ROM by power-on
System image file is "flash:/c2950-i6q4l2-mz.121-13.EA1b.bin"
cisco WS-C2950G-48-EI (RC32300) processor (revision C0) with 20839K bytes of memory.
Processor board ID FHK0624W0HS
Last reset from system-reset
Running Enhanced Image
48 FastEthernet/IEEE 802.3 interface(s)
2 Gigabit Ethernet/IEEE 802.3 interface(s)
32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:09:E8:89:4A:40
Motherboard assembly number: 73-7409-08
Power supply part number: 34-0965-01
Motherboard serial number: FOxxxx
Power supply serial number: DAB062143BP
Model revision number: C0
Motherboard revision number: B0
Model number: WS-C2950G-48-EI
System serial number: Fxxxxx
Configuration register is 0xF
Switch#config t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#spanning-tree vlan 1 priority 32768
Switch(config)#end
Switch#sh spanning
00:02:53: %SYS-5-CONFIG_I: Configured from console by console-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0005.7428.1740
Cost 19
Port 24 (FastEthernet0/24)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0009.e889.4a40
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/24 Root FWD 19 128.24 P2p
Switch#
Can you show snapshots of your output and config?
LW
06-20-2003 05:55 AM
I ran into a problem on a 6513 when the changes that allow for more vlans were turned on. It takes bits away from the priority field in the bpdu. See if this is turned on and try turning it off.
spanning-tree extend system-id
06-20-2003 07:18 AM
Switch2950#show version
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(13)EA1b, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Tue 15-Apr-03 12:25 by yenanh
Image text-base: 0x80010000, data-base: 0x805A8000
ROM: Bootstrap program is CALHOUN boot loader
Switch2950 uptime is 1 minute
System returned to ROM by power-on
System image file is "flash:c2950-i6q4l2-mz.121-13.EA1b.bin"
cisco WS-C2950-24 (RC32300) processor (revision B0) with 20839K bytes of memory.
Processor board ID FOC0534X11L
Last reset from system-reset
Running Standard Image
24 FastEthernet/IEEE 802.3 interface(s)
32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:07:50:43:EF:C0
Motherboard assembly number: 73-5781-08
Power supply part number: NONE
Motherboard serial number: FOC053400PR
Power supply serial number: DAB05320SC5
Model revision number: B0
Model number: WS-C2950-24
System serial number: FOC0534X11L
Configuration register is 0xF
Switch2950#show running-config
Building configuration...
Current configuration : 7415 bytes
!
version 12.1
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime localtime show-timezone
service timestamps log datetime localtime show-timezone
service password-encryption
!
hostname Switch2950
!
logging buffered 8192 notifications
!
clock timezone MET 1
clock summer-time METDST recurring last Sun Mar 2:00 last Sun Oct 3:00
ip subnet-zero
no ip domain-lookup
vtp domain NULL
vtp mode transparent
no cluster run
!
!
spanning-tree mode pvst
spanning-tree loopguard default
spanning-tree portfast default
spanning-tree portfast bpduguard default
spanning-tree portfast bpdufilter default
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
spanning-tree uplinkfast
spanning-tree backbonefast
!
!
vlan 1
tb-vlan1 1002
tb-vlan2 1003
!
vlan 2
name stnet-out
!
vlan 3
name dmz-nat
!
vlan 4
name test
!
vlan 20
name backbone
!
vlan 1002
tb-vlan1 1
tb-vlan2 1003
!
vlan 1003
tb-vlan1 1
tb-vlan2 1002
parent 1005
backupcrf enable
!
vlan 1004
bridge 1
stp type ibm
!
vlan 1005
bridge 1
!
interface FastEthernet0/1 to 0/8 are the same
description -
switchport access vlan 2
switchport trunk native vlan 2
switchport trunk allowed vlan 2-1005
switchport mode access
switchport nonegotiate
no ip address
spanning-tree portfast
!
!
interface FastEthernet0/9 to 0/16 are the same
description -
switchport access vlan 3
switchport trunk native vlan 3
switchport trunk allowed vlan 2-1005
switchport mode access
switchport nonegotiate
no ip address
spanning-tree portfast
!
!
interface FastEthernet0/17 to 0/23 are the same
description -
switchport access vlan 4
switchport trunk native vlan 4
switchport trunk allowed vlan 2-1005
switchport mode access
switchport nonegotiate
no ip address
spanning-tree portfast
!
!
interface FastEthernet0/24
description -
switchport access vlan 20
switchport trunk native vlan 20
switchport trunk allowed vlan 2-1005
switchport mode access
switchport nonegotiate
no ip address
spanning-tree portfast
!
interface Vlan1
no ip address
no ip route-cache
shutdown
!
interface Vlan20
description managment vlan
ip address 172.16.20.7 255.255.255.0
no ip route-cache
!
ip default-gateway 172.16.20.10
no ip http server
!
cdp timer 254
snmp-server engineID local 00000009020000075043EFC0
snmp-server community private RW 7
snmp-server community public RO 7
!
line con 0
exec-timeout 60 0
stopbits 1
line vty 0 4
login
line vty 5 15
login
!
end
Switch2950#sh spanning-tree
VLAN0020
Spanning tree enabled protocol ieee
Root ID Priority 49172
Address 0007.5043.efc0
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 49172 (priority 49152 sys-id-ext 20)
Address 0007.5043.efc0
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Uplinkfast enabled
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/24 Desg FWD 3100 128.24 Edge Shr
Please note the below command , because its the default it does not show on the running-config , but the spanning tree gets as default 49152 .
!
spanning-tree vlan 1 priority 32768
spanning-tree vlan 2 priority 32768
spanning-tree vlan 3 priority 32768
spanning-tree vlan 20 priority 32768
!
Other note my Image is running as Standard Image .
06-20-2003 05:51 AM
Hi,
49152 is a value which is typically set when you enable UplinkFast on a switch with default STP configuration.
Isn't that your case?
Regards,
Milan
06-20-2003 07:13 AM
Yes , but i'm also forcing the priority .
spanning-tree vlan 1 priority 32768
spanning-tree vlan 2 priority 32768
spanning-tree vlan 3 priority 32768
spanning-tree vlan 20 priority 32768
It works for any value , except the one above !
Patrizio
07-02-2003 12:33 AM
Hi,
are you saying that
spanning-tree vlan 1 priority 32 000 works fine
but
spanning-tree vlan 1 priority 32768
sets the STP priority to 49152?
If yes, I would try to disable UplinkFast and try
spanning-tree vlan 1 priority 32768 again.
It should work correctly.
Then enable UplinkFast. The priority should increase to 49152 (standard UplinkFast feature).
After that try
spanning-tree vlan 1 priority 32768 again.
If the priority remains 49152 I would consider this behaviour as UplinkFast bug and report it to TAC.
Regards,
Milan
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