MST

SW3#sh spanning-tree summary
Switch is in pvst mode
Root bridge for: none
Extended system ID           is enabled
Portfast Default             is disabled
PortFast BPDU Guard Default  is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default            is disabled
EtherChannel misconfig guard is enabled
Configured Pathcost method used is short
UplinkFast                   is disabled
BackboneFast                 is disabled

Name                   Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001                     1         0        0         19         20
VLAN0002                     1         0        0          2          3
VLAN0003                     1         0        0          2          3
VLAN0004                     1         0        0          2          3
VLAN0005                     1         0        0          2          3
---------------------- -------- --------- -------- ---------- ----------
5 vlans                      5         0        0         27         32

SW2# sh spanning-tree summary
Switch is in pvst mode
Root bridge for: VLAN0004-VLAN0005
Extended system ID           is enabled
Portfast Default             is disabled
PortFast BPDU Guard Default  is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default            is disabled
EtherChannel misconfig guard is enabled
Configured Pathcost method used is short
UplinkFast                   is disabled
BackboneFast                 is disabled

Name                   Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001                     0         0        0         24         24
VLAN0002                     0         0        0          2          2
VLAN0003                     0         0        0          2          2
VLAN0004                     0         0        0          2          2
VLAN0005                     0         0        0          2          2
---------------------- -------- --------- -------- ---------- ----------
5 vlans                      0         0        0         32         32

SW1#sh spanning-tree summary
Switch is in pvst mode
Root bridge for: VLAN0001-VLAN0003
Extended system ID           is enabled
Portfast Default             is disabled
PortFast BPDU Guard Default  is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default            is disabled
EtherChannel misconfig guard is enabled
Configured Pathcost method used is short
UplinkFast                   is disabled
BackboneFast                 is disabled

Name                   Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001                     0         0        0         24         24
VLAN0002                     0         0        0          2          2
VLAN0003                     0         0        0          2          2
VLAN0004                     0         0        0          2          2
VLAN0005                     0         0        0          2          2
---------------------- -------- --------- -------- ---------- ----------
5 vlans                      0         0        0         32         32

configuramos en los 3 switch los mismos datos de mst

SW1(config)# spanning-tree mst configuration SW1(config-mst)# name CCNP SW1(config-mst)# revision 1

conf t spanning-tree mst config instance 1 vlan 2,3 instance 2 vlan 4,5 end configuramos el root primary y secondary para las instancias mst SW1(config)# spanning-tree mst 1 root primary SW1(config)# spanning-tree mst 2 root secondary In this example, you have changed the MST switch priority by using spanning-tree mst instance-id root {primary | secondary}. This command is actually a macro that sets the switch MST priority, which is a number. If you issue show running-config, you will see the switch priority as a number—not as the primary or secondary keyword. SW2(config)# spanning-tree mst 1 root secondary SW2(config)# spanning-tree mst 2 root primary cambiamos el modo de STP antes rapid-PVST ahora MST SW1(config)# spanning-tree mode mst SW2(config)# spanning-tree mode mst SW3(config)# spanning-tree mode mst Antes  protocol stp ieee, ahora mstp

VLAN0001   Spanning tree enabled protocol ieee   Root ID    Priority    32769              Address     aabb.cc00.3800              Cost        100              Port        3 (Ethernet0/2)              Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec MST0   Spanning tree enabled protocol mstp   Root ID    Priority    32768              Address     aabb.cc00.3800              Cost        0              Port        3 (Ethernet0/2)              Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec