How do I enable RSTP on a 3750 switch? 1

[paul3461000]

Or is it running by default?

How do I determine if 802.1d or 802.1w is running?

Thanks in advance.

 

[ADB100]

Cisco switches by default run PVST+ (Per VLAN Spanning Tree+) which is compatible with 802.1d STP. Most newer switches support PVST+, Rapid-PVST+ & MST. With IOS-based switches you can check what version you are running with the command 'show spanning-tree summary':

cat-3550#sho spanning-tree summary
Switch is in rapid-pvst mode
Root bridge for: VLAN0010, VLAN0020, VLAN0030
Extended system ID           is enabled
Portfast Default             is enabled
PortFast BPDU Guard Default  is enabled
Portfast BPDU Filter Default is enabled
Loopguard Default            is enabled
EtherChannel misconfig guard is enabled
UplinkFast                   is disabled
BackboneFast                 is disabled
Configured Pathcost method used is short

Name                   Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0010                     0         0        0          6          6
VLAN0020                     0         0        0          1          1
VLAN0030                     0         0        0          1          1
---------------------- -------- --------- -------- ---------- ----------
3 vlans                      0         0        0          8          8
cat-3550#

To change the STP mode use the global configuration command 'spanning-tree mode XXX':

cat-3550(config)#spanning-tree mode ?
  mst         Multiple spanning tree mode
  pvst        Per-Vlan spanning tree mode
  rapid-pvst  Per-Vlan rapid spanning tree mode

cat-3550(config)#spanning-tree mode

HTH

Andy

 

[paul3461000]

Thanks ABD100.