Configuration Guide User guide
1142 FastIron Configuration Guide
53-1002494-02
STP feature configuration
TABLE 199 CLI display of 802.1W summary
Field Description
VLAN ID The port-based VLAN that owns the STP instance. VLAN 1 is the default
VLAN. If you have not configured port-based VLANs on this device, all
802.1W information is for VLAN 1.
Bridge IEEE 802.1W parameters
Bridge Identifier The ID of the bridge.
Bridge Max Age The configured max age for this bridge. The default is 20.
Bridge Hello The configured hello time for this bridge.The default is 2.
Bridge FwdDly The configured forward delay time for this bridge. The default is 15.
Force-Version The configured force version value. One of the following value is
displayed:
• 0 – The bridge has been forced to operate in an STP compatibility
mode.
• 2 – The bridge has been forced to operate in an 802.1W mode.
(This is the default.)
txHoldCnt The number of BPDUs that can be transmitted per Hello Interval. The
default is 3.
Root Bridge Identifier ID of the Root bridge that is associated with this bridge
Root Path Cost The cost to reach the root bridge from this bridge. If the bridge is the root
bridge, then this parameter shows a value of zero.
Designated Bridge Identifier The bridge from where the root information was received.It can be from
the root bridge itself, but it could also be from another bridge.
Root Port The port on which the root information was received. This is the port
that is connected to the Designated Bridge.
Max Age The max age is derived from the Root port. An 802.1W-enabled bridge
uses this value, along with the hello and message age parameters to
compute the effective age of an RST BPDU.
The message age parameter is generated by the Designated port and
transmitted in the RST BPDU. RST BPDUs transmitted by a Designated
port of the root bridge contains a message value of zero.
Effective age is the amount of time the Root port, Alternate port, or
Backup port retains the information it received from its peer Designated
port. Effective age is reset every time a port receives an RST BPDU from
its Designated port. If a Root port does not receive an RST BPDU from its
peer Designated port for a duration more than the effective age, the
Root port ages out the existing information and recomputes the
topology.
If the port is operating in 802.1D compatible mode, then max age
functionality is the same as in 802.1D (STP).