Foundry NetIron M2404C and M2404F Metro Access Switches
Configuring RSTP (Rev. 03)
Rapid Spanning Tree Protocol (RSTP)
© 2008 Foundry Networks, Inc.
Page 23 of 34
device-name
(cfg protocol)#
rapid-spanning-tree interface all
============================================================================
Port |Pri|Prt role|State |PCost |DCost |Designated bridge |DPrt |FwrdT
--------+---+--------+-------+-------+-------+------------------+------+-
01/01/01 128 Designat frwrd 40000 400000 32768.0012F2010101 128.01 2
01/01/03 128 Designat frwrd 200000 400000 32768.0012F2010101 128.03 1
01/01/04 128 Designat frwrd 200000 400000 32768.0012F2010101 128.04 1
01/01/20 128 Altern discr 200000 200000 32768.0012F2112990 128.20 1
01/01/21 128 Root frwrd 200000 200000 32768.0012F2112990 064.21 3
Example 3
The following example displays the RSTP topology for all interfaces from Interface Configuration
mode:
device-name
(config-if 1/1/1)#
rapid-spanning-tree all
============================================================================
Port |Pri|Prt role|State |PCost |DCost |Designated bridge |DPrt |FwrdT
--------+---+--------+-------+-------+-------+------------------+------+-
01/01/01 128 Designat frwrd 40000 400000 32768.0012F2010101 128.01 2
01/01/03 128 Designat frwrd 200000 400000 32768.0012F2010101 128.03 1
01/01/04 128 Designat frwrd 200000 400000 32768.0012F2010101 128.04 1
01/01/20 128 Altern discr 200000 200000 32768.0012F2112990 128.20 1
01/01/21 128 Root frwrd 200000 200000 32768.0012F2112990 064.21 3
Table 9: Parameters Displayed by RSTP Show Commands for a Specific Interface
Parameter
Description
PortPriority
The port priority, which is part of the port identifier.
PortState
The current state of the port (i.e., Disabled, Listening, Learning,
Forwarding, or Blocking).
PortRole
The current role of the port (i.e., Root, Designated, Backup, or
Alternate).
PortEnable
The link state of the port.
PortPathCost
The contribution of the path through this port, when the port is the Root
port, to the total cost of the path to the root for this bridge.
This parameter is used, added to the value of the Designated Cost
parameter for the Root port, as the value of the Root Path Cost parameter
offered in all Configuration BPDUs transmitted by the Bridge, when it is
not the Root.
DesignatedRoot
The unique Bridge Identifier of the Bridge recorded as the Root in the
Root Identifier parameter of Configuration BPDUs transmitted by the
Designated Bridge for the LAN to which the port is attached.
This parameter is used to test the value of the Root Identifier parameter
conveyed in received Configuration BPDUs.
DesignatedCost
For a Designated port, the path cost (equal to the Root Path Cost of the
Bridge) offered to the LAN to which the port is attached; otherwise, it is
the cost of the path to the Root offered by the Designated port on the
LAN to which this port is attached.
This parameter is used to test the value of the Root Path Cost parameter
conveyed in received Configuration BPDUs.