Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 499)

Multi-Service IronWare Switching Configuration Guide 469
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show rstp
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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.
Fwd Dly The number of seconds a non-edge Designated port waits until it can apply any of the
following transitions, if the RST BPDU it receives does not have an agreed flag:
•
Discarding state to learning state
•
Learning state to forwarding state
When a non-edge port receives the RST BPDU it goes into forwarding state within 4
seconds or after two hello timers expire on the port.
Fwd Dly is also the number of seconds that a Root port waits for an RST BPDU with a
proposal flag before it applies the state transitions listed above.
If the port is operating in 802.1D compatible mode, then forward delay functionality is
the same as in 802.1D (STP).
RSTP (IEEE 802.1W) Port Parameters
Port Num The port number shown in a slot#/port# format.
Pri The configured priority of the port. The default is 128 or 0x80.
Port Path Cost The configured path cost on a link connected to this port.
P2P Mac Indicates if the point-to-point-mac parameter is configured to be a point-to-point link:
•
T – The link is configured as a point-to-point link.
•
F – The link is not configured as a point-to-point link. This is the default.
Edge port Indicates if the port is configured as an operational Edge port:
•
T – The port is configured as an Edge port.
•
F – The port is not configured as an Edge port. This is the default.
Role The current role of the port:
•
Root
•
Designated
•
Alternate
•
Backup
•
Disabled
Output field Description