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CrossFire 8600/8605 Token-Ring Switches v. 1.2, P/N: 710001641 Monitoring the Network with the Console
Max Message Age
Time at which the configuration message used by the spanning-tree algorithm
should be discarded. This time is advertised by the root and used by all devices and
switches in the active topology of the spanning-tree network.
Forward Delay
Time the root waits between transitions from listening to learning, and from
learning to forwarding. This time is advertised by the root and used by all devices
and switches in the active topology of the spanning-tree network.
CRF
VLAN ID of a TrCRF belonging to this TrBRF.
PId
Port ID that is used to determine the role of the port in the spanning tree. The port
ID is expressed in the form
port priority.port number.
PCst
Cost associated with each port. Lower numbers are generally assigned to ports
attached to faster media (such as FDX or CrossLinks), and higher numbers are
generally assigned to ports attached to slower media.
PSts
Current status of this CRF within the spanning tree. Possible values are:
•
DIS
(Disabled)
•
BLK
(Blocked)
•
LSN
(Listening)
•
LRN
(Learning)
•
FWD
(Forwarding)
The rules that define the state of the port are as follows:
•
A CRF that does not connect to other switches or bridges is always forwarding.
•
When the switch is booted, all CRFs are blocked initially, and then some of
them change to a different state: listening, learning, and forwarding, in that
order. All CRFs that are going to change states from blocking to forwarding
will have done so after two to three times the value of:
Switch Maximum Message Age
+ (2 x
Switch Forward Delay
)