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Alteon OS Command Reference
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Chapter 4: The Information Menu 40M2420, April 2007
Forwarding delay
Aging time
You can view port-specific RSTP information, including the following:
Port number and priority
Cost
State
The following table describes the STP parameters in RSTP or MSTP mode.
Table 4-17 RSTP/MSTP Parameter Descriptions
Parameter Description
Current Root The Current Root shows information about the root bridge for the Spanning
Tree. Information includes the priority (hex) and MAC address of the root.
Priority (bridge) The bridge priority parameter controls which bridge on the network will
become the STP root bridge.
Hello The hello time parameter specifies, in seconds, how often the root bridge
transmits a configuration bridge protocol data unit (BPDU). Any bridge that
is not the root bridge uses the root bridge hello value.
MaxAge The maximum age parameter specifies, in seconds, the maximum time the
bridge waits without receiving a configuration bridge protocol data unit
before it reconfigures the STP network.
FwdDel The forward delay parameter specifies, in seconds, the amount of time that a
bridge port has to wait before it changes from learning state to forwarding
state.
Aging The aging time parameter specifies, in seconds, the amount of time the
bridge waits without receiving a packet from a station before removing the
station from the Forwarding Database.
Prio
(port) The port priority parameter helps determine which bridge port becomes the
designated port. In a network topology that has multiple bridge ports con-
nected to a single segment, the port with the lowest port priority becomes the
designated port for the segment.
Cost The port path cost parameter is used to help determine the designated port for
a segment. Generally speaking, the faster the port, the lower the path cost. A
setting of 0 indicates that the cost will be set to the appropriate default after
the link speed has been auto negotiated.
State The State field shows the current state of the port. The State field in RSTP or
MSTP mode can be one of the following: Discarding (DISC),
Learning (LRN), Forwarding (FWD), or Disabled (DSB).