10-06-2006 06:34 AM - edited 03-05-2019 12:06 PM
hi all,
We have 2 core switches. 1 is made as vtp server and other is client. HSRP is configured between them so that in case if one goes ther other will serve vlans.
I defined a vlan 13 on primary switch with a set of private ip addresses as given below:
interface Vlan13
ip address 10.250.7.4 255.255.255.0
no ip redirects
standby 1 ip 10.250.7.1
standby 1 priority 85
standby 1 preempt
!
spanning-tree vlan 1,5,7,9,13 priority 4096
And saved the conf.
when i run the command,
sh spanning-tree vlan 13 it gives me an error like given below:
"Spanning tree instance(s) for vlan 13
does not exist."
I would like to know what i must do in order to enable the spanning-tree on vlan.
Thanks
sugunakar
10-06-2006 06:40 AM
Sugunakar,
Do a show vlan 13 and see if vlan 13 shows up there. If it doesn't then you need to create a VLAN 13 and that can be done by entering the following command in the global config mode as follows.
config t
vlan 13
HTH
Sundar
10-09-2006 04:34 AM
Here is the output from my config file:
#Sh VLAN
VLAN Name Status Ports
---- -------------------------------- --------- ----------
1 default active Gi1/0/1, G
Gi1/0/23,
10 xxxxA active
11 ccccc active
12 sssss active
13 jjjj active
And one thing i observed
SWB11FSR1#sh spanning-tree vlan 13
Spanning tree instance(s) for vlan 13 does not exist.
I am able to see the same vlan in other switch which is configured as HSRP for vlans and it is marked as root there.
I want this switch to recognise this vlan in spanning-tree and become root.
One more observation:
I am seeing a line like
!
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
no spanning-tree vlan 13
spanning-tree vlan 1,5,7,9,11,13,900 priority 4096
spanning-tree vlan 6,8,12,14,200 priority 8192
I am unable to remove the line
"no spanning-tree vlan 13".
Thanks in advance
Regards
sugun
10-09-2006 01:18 PM
Hi Sugun,
The command should be "spanning-tree vlan 13" to get rid of the "no spanning-tree vlan 13" in your configuration. Do you see any error message when you are attempting to add this?
There won't be any stp instance running for vlan 13 unless there is a least one port carrying traffic for vlan 13 on this switch. So make sure that there is an access port in vlan 13 or a trunk carrying vlan 13 up on your box.
Regards,
Francois
10-09-2006 09:43 PM
Hi Francois,
Thank you very much Francois.
I was assuming no spanning-tree was something like comment and i cant remove. The moment, i used the "spanning-tree vlan 13 ", everything is working fine.
Thank you very much for your valuable inputs.
Regards
sugun
10-06-2006 07:15 AM
Is spanning tree working for your other VLANs? Try a 'show spann sum', you should see STP for all your VLANs. If it's just 13 that is not working, try 'sh vlan' and make sure 13 is in the VLAN database. If it is try 'sh int vlan 13' and make sure it is up. Post your results.
10-09-2006 04:37 AM
hi ceclark,
Thanks for the response.
I am able to see that the int vlan 13 is up.
sh span sum is not showing the vlan 13.
Here is the output from my config file:
#Sh VLAN
VLAN Name Status Ports
---- -------------------------------- --------- ----------
1 default active Gi1/0/1, G
Gi1/0/23,
10 xxxxA active
11 ccccc active
12 sssss active
13 jjjj active
And one thing i observed
SWB11FSR1#sh spanning-tree vlan 13
Spanning tree instance(s) for vlan 13 does not exist.
I am able to see the same vlan in other switch which is configured as HSRP for vlans and it is marked as root there.
I want this switch to recognise this vlan in spanning-tree and become root.
One more observation:
I am seeing a line like
!
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
no spanning-tree vlan 13
spanning-tree vlan 1,5,7,9,11,13,900 priority 4096
spanning-tree vlan 6,8,12,14,200 priority 8192
I am unable to remove the line
"no spanning-tree vlan 13".
Thanks in advance
Regards
sugun
10-09-2006 05:54 AM
That helps, thanks for posting the config. Is VLAN 13 configured on the other Core? What is your trunk between the two cores (single connection or etherchannel)? Can you see if VLAN 13 is trunking between the cores? Is vlan 13 in STP on the other Core?
10-09-2006 10:21 AM
hI ceclark
VLAN 13 is configured on other core(infact on two cores).
There is no trunk port confgured between the two cores. i am attachng cdp neghbor output from both cores.
VLAN 13 is not a trunkng one.
SWB11FSR1>sh cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Swtch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
SWB11FSR10 Gig 1/0/19 169 S I WS-C2950T-Gig 0/2
SWB11FSR11 Gig 1/0/14 129 S I WS-C2950T-Gig 0/2
SWB13FZA1 Gig 1/0/7 138 S I WS-C2950T-Gig 0/2
SWB12FZA1 Gig 1/0/9 146 S I WS-C2950T-Gig 0/2
SWB12FZB1 Gig 1/0/11 142 S I WS-C2950T-Gig 0/2
SWB12FZA3 Gig 1/0/10 145 S I WS-C2950T-Gig 0/2
SWB13FZB1 Gig 1/0/8 153 S I WS-C2950T-Gig 0/2
SWB14FZB1 Gig 1/0/6 127 T S WS-C2924-XFas 0/24
SWB13FZA4 Gig 1/0/16 174 S I WS-C3550-2Fas 0/23
SWB13FZB4 Gig 1/0/15 120 S I WS-C3550-2Fas 0/23
SWB12FZB4 Gig 1/0/17 147 S I WS-C3550-2Fas 0/23
SWB14FZA1 Gig 1/0/5 177 S I WS-C2950T-Gig 0/2
SWB11FSR3 Gig 1/0/12 178 S I WS-C2950T-Gig 0/2
SWB16FSR5 Gig 1/0/20 136 S I WS-C2950T-Gig 0/1
SWB11FSR5 Gig 1/0/13 149 S I WS-C2950T-Gig 0/2
SWB16FSR3 Gig 1/0/4 121 S I WS-C2950T-Gig 0/2
SWB11FSR7 Gig 1/0/18 142 S I WS-C2950T-Gig 0/2
BANG-PSW2.fcgis.cGig 1/0/3 132 S I WS-C3550-2Fas 0/23
JAB050406DZ(SWB16Gig 1/0/2 146 T S WS-C4006 2/11
SWB11FSR2>sh cdp neighbors
Device ID Local Intrfce Holdtme Capability Platform Port ID
SWB11FSR13 Gig 1/0/14 161 S I WS-C2950T-Gig 0/2
SWB12FZB3 Gig 1/0/11 124 S I WS-C2950T-Gig 0/2
SWB13FZB3 Gig 1/0/8 172 S I WS-C2950T-Gig 0/2
SWB12FZA2 Gig 1/0/9 124 S I WS-C2950T-Gig 0/2
SWB13FZA3 Gig 1/0/7 168 S I WS-C2950T-Gig 0/2
SWB13FZA4 Gig 1/0/16 153 S I WS-C3550-2Fas 0/24
SWB14FZB3 Gig 1/0/6 179 S I WS-C3550-2Fas 0/24
SWB13FZB4 Gig 1/0/15 158 S I WS-C3550-2Fas 0/24
SWB12FZB4 Gig 1/0/17 125 S I WS-C3550-2Fas 0/24
SWB16FSR4 Gig 1/0/4 165 S I WS-C2950T-Gig 0/2
SWB11FSR4 Gig 1/0/12 154 S I WS-C2950T-Gig 0/2
SWB11FSR9 Gig 1/0/19 163 S I WS-C2950T-Gig 0/2
SWB11FSR8 Gig 1/0/18 169 S I WS-C2950T-Gig 0/2
BANG-PSW2.fcgis.cGig 1/0/3 170 S I WS-C3550-2Fas 0/24
BANG-PSW3.fcgis.cGig 1/0/13 128 S I WS-C3550-2Fas 0/24
BANG-PSW1.fcgis.cGig 1/0/10 121 S I WS-C3550-2Fas 0/24
BANG-PSW4.fcgis.cGig 1/0/5 172 S I WS-C3550-2Fas 0/24
JAB050406DZ(SWB16Gig 1/0/2 125 T S WS-C4006 2/12
yes. VLAN 13 is in STP in other core. Below s the
SWB11FSR2#sh spanning-tree vlan 13
VLAN0013
Spanning tree enabled protocol ieee
Root ID Priority 8205
Address 000f.90c9.9800
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 8205 (priority 8192 sys-id-ext 13)
Address 000f.90c9.9800
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
10-09-2006 10:43 AM
Why is ther no layer2 trunk between the core switches? What trunks are vlan 13 allowed on? Is vlan 13 able to communicate with all the core switches and distro/access switches at layer 2?
10-09-2006 09:47 PM
Hi Clark,
From the begining there is no layer 2 trunk between these devices. On all trunks vlan 13 is allowed as we never kept any restrictions in cores.
The soln to this problem is provided by francois.
I was assuming no spanning-tree was something like comment and i cant remove. The moment, i used the "spanning-tree vlan 13 ", everything is working fine.
I really appreciate the kind of help i got from you and this forum.
Regards
sugun
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