H3C S7500 Series Ethernet Switches Command Manual

Command Manual – MSTP
H3C S7500 Series Ethernet Switches Chapter 1
MSTP Configuration Commands
1-4
z If both an MSTI and a port list are specified, the command displays spanning tree
information about the specified MSTI and the specified ports in the order of MSTI
IDs.
MSTP state information includes:
z Global CIST parameters: Protocol operation mode, switch priority in the CIST
instance, MAC address, Hello time, Max age, Forward delay, Max hops, the CIST
root, the external path cost from the switch to the CIST root, region root, the
internal path cost from the switch to the region root, CIST root port of the switch,
the state of the BPDU (bridge protocol data unit) guard function (enabled or
disabled), and the state of the digest snooping function (enabled or disabled).
z CIST port parameters: Port protocol, port role, port priority, path cost, designated
bridge, designated port, edge port/non-edge port, whether or not the link on the
port is a point-to-point link, the maximum transmitting speed, type of the enabled
guard function, state of the digest snooping function (enabled or disabled), VLAN
mappings, Hello time, Max age, Forward delay, Message-age time, and
Remaining-hops.
z Global MSTI parameters: MSTI ID, bridge priority of the MSTI, region root, internal
path cost, MSTI root port, and master bridge.
z MSTI port parameters: Port state, role, priority, path cost, designated bridge,
designated port, and Remaining Hops.
The statistical information includes: the numbers of the TCN BPDUs, the configuration
BPDUs, the RST BPDUs, and the MST BPDUs transmitted/received by each port.
Related commands: reset stp.
Examples
# Display the state and statistical information about an MSTI.
<H3C> display stp instance 0 interface Ethernet 2/0/1 to Ethernet 2/0/4 brief
MSTID Port Role STP State Protection
0 Ethernet2/0/1 ALTE DISCARDING LOOP
0 Ethernet2/0/2 DESI FORWARDING NONE
0 Ethernet2/0/3 DESI FORWARDING NONE
0 Ethernet2/0/4 DESI FORWARDING NONE
Table 1-2 Description on the fields of the display stp command
Field Description
MSTID ID of an MSTI in the MST region
Port Port number corresponding to the specified MSTI
Role Port role