Foundry NetIron M2404C and M2404F Metro Access Switches
Configuring MSTP (Rev. 03)
Overview
© 2008 Foundry Networks, Inc
Page 41 of 70
Regional Root = This bridge is the root
RemainingHopCount = 0
TimeSinceTopologyChange = 3039 (Sec)
TopChanges = 3
Border Bridge = enabled
=====================================================================
Port |Pri|Prt role|State|PCost |DCost |Designated bridge |DPrt
--------+---+--------+-----+------+-------+------------------+-------
01/01/02 128 Root block 200000 0 00000.0012F20F2F27 128.006
MST01
VLAN mapped = 3
Priority = 32768
Regional Root = This bridge is the root
RemainingHopCount = 40
TimeSinceTopologyChange = 3039 (Sec)
TopChanges = 0
Border Bridge = disabled
=====================================================================
Port |Pri|Prt role|State|PCost |DCost |Designated bridge |DPrt
--------+---+--------+-----+------+-------+------------------+-------
01/01/02 128 Boundary block 200000 0 32768.00F2120B0AFA 128.002
Table 9: Parameters Displayed by
show mstp
Command
Parameter
Description
Multiple spanning trees
Indicates whether MSTP is enabled or disabled on the switch.
ProtocolSpecification
Displays the supported IEEE standard.
Priority
The bridge priority, which is part of the bridge identifier.
TimeSinceTopologyChange
The count in seconds since tcWhile timer (Topology-Change
State Machine timer, specified in IEEE 802.1s, 13.21) for any
Port was non-zero.
TopChanges
The number of topology changes detected for all the MSTIs.
CIST Root
The CIST Regional Root Identifier. The Bridge Identifier of the
current CIST Regional Root.
CIST Port
The port in the switch from which the traffic flows to the CIST
root.
CIST Cost
The CIST Path Cost. The CIST path cost from the transmitting
Bridge to the CIST Regional Root.
MaxAge
The maximum age in seconds of received protocol information
before it is discarded.
HelloTime
The time interval in seconds between the transmissions of
Configuration BPDUs by a Bridge that is attempting to become
the Root or is the Root.
ForwardDelay
The forward time for all MST instances. The forward delay is
the number of seconds a port waits before changing from its
spanning-tree learning and listening states to the forwarding
state.