Displaying Spanning Tree
Information for a VSD
Use the Spanning Tree by VSDs window to view bridging information
for a VLAN Secure Domain.
Field Descriptions
VSD Bridge Parameters |
My ID |
Identifier used in a spanning tree network
to uniquely identify each bridge on the network. |
Root |
Root Bridge: The bridge with the highest
priority bridge ID that is selected as the root of the spanning tree. In an extended
local area network (LAN), the root bridge controls the spanning tree configuration by
originating Hello Messages. The root bridge is responsible for keeping the spanning
tree intact. |
VSD Name
|
Name assigned to the VSD. |
Root Cost
|
Cost of the path to the root from the
bridge that is transmitting the Hello Messages. |
Forward
Delay |
Number of seconds a bridge waits before
allowing disabled bridge ports to transition to the forwarding state. The value can be
from 4 through 30 seconds. The default is 15 seconds. |
Topology
Changes |
Number of network topology changes detected
since the last Hello Message was transmitted by the bridge. |
Hello
Time |
Frequency with which the bridge port transmits Hello Messages to
check for changes in network topology. The value can be from 1to 10 seconds. The
default is 2 seconds. The greater the frequency ( the lower the number of seconds),
the sooner changes in topology are detected. The lower the frequency (the greater the
number of seconds), the lower the overhead associated with detecting changes. |
Max
Age |
Maximum amount of time a bridge port waits to receive a Hello
Message before the bridge recalculates the root, path cost, and root port. The value can
be from 6 to 40. The default is 20. |
Per Port Parameters |
Port # |
Port's assigned number. |
Interface |
Type of interface associated with the port.
|
Address |
Bridge's MAC address. |
Des. Root |
Designated root, the bridge ID of the rest
of the spanning tree as determined by the STP as executed by this bridge. |
Des.
Bridge |
Bridge ID of the bridge this port considers to be the
designated bridge for this port's segment. |
State |
Operational state of the port (up, down,
forwarding). |
Manual |
State of bridge learning (enabled or disabled). If
manual mode is enabled, the port's forwarding table that contains learned addressess is
purged, and new addresses are not learned. However, you can still configure MAC address
filters manually. See Configuring Permanent
Address Filters for more informaiton. |
Des. Cost |
Path cost. Path cost can range from 1
to 65535, with higher values indicating higher costs. |
Prio-Des. Port |
ID of the port on the
designated bridge for this port's segment. |
|