07-13-2007 08:43 AM - edited 03-05-2019 05:17 PM
I have a WS-C3524-PWR-XL I'd like to bring in to temporary service, and need to migrate it from STP to PVST. Does anybody know the command(s) to do this? Usually it's "spanning-tree mode pvst", but even with the latest IOS I don't have that option:
Switch(config)#spanning-tree ?
forward-time Set a Spanning Tree FORWARD Interval
hello-time Set a Spanning Tree HELLO Interval
max-age Set a Spanning Tree MAX AGE Interval
portfast Allow a change from blocking to forwarding
priority Set a Spanning Tree Priority
protocol Spanning tree protocol type
uplinkfast Enable UplinkFast Feature
vlan VLAN Switch Spanning Trees
<cr>
The IOS version is 12.0(5)WC17
Solved! Go to Solution.
07-13-2007 10:42 AM
On those switches, there is a difference between the number of vlans supported and the number of STP instances supported.
Doing a google search, I found this page, that states that the 3500XL supports 64 stp instances and 250 vlans.
http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a0080094e78.shtml#STP
Regards,
Francois
07-13-2007 08:50 AM
Hi John,
I don't know the exact release or the exact hardware you are mentioning, but this switch is already running PVST. In fact, PVST was the only option on Cisco switches before we introduced MST and then Rapid-PVST. So the good news is that you don't need to do any migration;-)
Regards,
Francois
07-13-2007 08:56 AM
All cisco switches actually run PVST+,including the 3500XL. You can see this information in the link below. If you do a "show spanning tree", it will show that the mode is PVST. So you don't really configure STP with PVST, it is there by default.
HTH,Please rate if it does.
-amit singh
07-13-2007 10:35 AM
OK, that is what's confusing me because I never see any mention of PVST with the "show spanning-tree summary" or "show spanning-tree" commands, but if I plug in a packet sniffer to a trunked port I see a BPDU for each VLAN every 2 seconds so that's enough to convince me ;)
Anyway, the reason I was asking about this is I noticed as soon as I configured a trunk port, the switch disables STP for our last 41 VLANS (we have 109 total). This would make perfect sense on a 2900XL since there's a limit of 68, but the 3500XL has a limit of 254 so I don't see why it's doing this.
no spanning-tree vlan 69
no spanning-tree vlan 70
no spanning-tree vlan 71
...
no spanning-tree vlan 108
no spanning-tree vlan 109
Ideas? The switch is running VTPv2 and pruning is enabled.
3500XL#show vtp status
VTP Version : 2
Configuration Revision : 484
Maximum VLANs supported locally : 254
Number of existing VLANs : 109
VTP Operating Mode : Client
VTP Domain Name : XXXXXX
VTP Pruning Mode : Enabled
VTP V2 Mode : Enabled
VTP Traps Generation : Disabled
MD5 digest : 0x58 0x2B 0x4F 0x85 0xA6 0x98 0x07 0x59
07-13-2007 10:42 AM
On those switches, there is a difference between the number of vlans supported and the number of STP instances supported.
Doing a google search, I found this page, that states that the 3500XL supports 64 stp instances and 250 vlans.
http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a0080094e78.shtml#STP
Regards,
Francois
07-13-2007 10:50 AM
Ahhh...ok then. These switches will only need be a part of STP for our wireless VLANs, so my solution will be use "switchport trunk allowed vlan" to limit STP to those ones.
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