Operating in Provider Bridge mode
MSTI 0 (CIST):
VLANS Mapped: 1-100, 500-1000, 1017
Root ID Priority 4097
Address 0004.9b78.0800
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4097 (priority 4096 sys-id-ext 1)
Address 0004.9b78.0800
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Port ID Designated Port ID
Name Prio.Nbr Cost Role State Cost Bridge ID Prio.Nbr
---------------------- -------- ------ --------- ------------------------ --------
GigabitEthernet0/1/2/1 128.65 20000 DSGN FWD 0 4097 0004.9b78.0800 128.65
GigabitEthernet0/1/2/2 128.66 20000 DSGN FWD 0 4097 0004.9b78.0800 128.66
...
The following example shows the output from the show spanning-tree mst command when the brief and
blocked-ports keywords are used:
RP/0/RSP0/CPU0:router# show spanning-tree mst a brief
MSTI 0 (CIST):
VLAN IDs: 1-100, 500-1000, 1017
This is the Root Bridge
MSTI 1:
VLAN IDS: 101-499
Root Port GigabitEthernet0/1/2/2 , Root Bridge ID 0002.9b78.0812
...
RP/0/RSP0/CPU0:router# show spanning-tree mst blocked-ports
MSTI 0 (CIST):
Interface Port ID Designated Port ID
Name Prio.Nbr Cost Role State Cost Bridge ID Prio.Nbr
---------------------- -------- ------ --------- ------------------------ --------
GigabitEthernet0/0/4/4 128.196 200000 ALT BLK 0 4097 0004.9b78.0800 128.195
...
Related Commands
DescriptionCommand
Enables debugging for sent and received MSTP packets.debug spanning-tree mst packet, on page 479
Enables debugging protocol-state changes such as port role
or state changes, topology change notification.
debug spanning-tree mst protocol-state, on
page 481
Displays the internal MSTI number and number of ports for
each VLAN.
show l2vpn mstp port, on page 585
Displays the Multiple Spanning Tree Protocol (MSTP) state
for the virtual local area network (VLAN) on a given interface.
show l2vpn mstp vlan, on page 587
Displays the contents of MSTP BPDUs being sent and
received on a particular interface.
show spanning-tree mst bpdu interface, on
page 592
Displays the VLAN ID to MSTI mapping table.show spanning-tree mst configuration, on page
594
Displays information about misconfiguration affecting MSTP.show spanning-tree mst errors, on page 596
Cisco ASR 9000 Series Aggregation Services Router VPN and Ethernet Services Command Reference, Release
6.1.x
590
Multiple Spanning Tree Protocol Commands
show spanning-tree mst
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