Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 469)

Multi-Service IronWare Switching Configuration Guide 439
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Displaying RSTP information
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The blocked parameter displays blocked ports only, for VLANs enabled with RSTP. When the
blocked parameter is not specified, all RSTP port states are displayed.
The vlan vlan-id parameter displays RSTP information for the specified port-based VLAN.
The show RSTP display command shows the information listed in Table 60 .
TABLE 60 CLI display of RSTP summary
This field... Displays...
VLAN ID The port-based VLAN that owns the STP instance and the number of RSTP
instances on that VLAN. VLAN 1 is the default VLAN. If you have not configured
port-based VLANs on this device, all RSTP information is for VLAN 1.
Bridge IEEE RSTP 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 RSTP mode. (This is the
default.)
txHoldCnt The number of BPDUs that can be transmitted per Hello Interval. The default is
3.
Root Bridge Parameters:
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 RSTP-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).
Hello The hello value derived from the Root port. It is the number of seconds
between two Hello packets.