Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 363)

Multi-Service IronWare Switching Configuration Guide 333
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IEEE 802.1D Spanning Tree Protocol (STP)
12
TABLE 54 CLI display of detailed STP information for ports
This field... Displays...
VLAN ID The VLAN that contains the listed ports and the number of STP instances on
this VLAN.
The STP type can be one of the following:
•
Proprietary multiple Spanning Tree
•
IEEE 802.1Q Single Spanning Tree (SSTP)
NOTE: If STP is disabled on a VLAN, the command displays the following
message instead: “Spanning-tree of port-vlan vlan-id is disabled.”
STP Bridge Parameters:
Bridge identifier The STP identity of this device.
Root The ID assigned by STP to the root bridge for this spanning tree.
Control ports The ports in the VLAN.
Active global timers The global STP timers that are currently active, and their current values. The
following timers can be listed:
•
Hello – The interval between Hello packets. This timer applies only to the
root bridge.
•
Topology Change (TC) – The amount of time during which the topology
change flag in Hello packets will be marked, indicating a topology change.
This timer applies only to the root bridge.
•
Topology Change Notification (TCN) – The interval between Topology
Change Notification packets sent by a non-root bridge toward the root
bridge. This timer applies only to non-root bridges.
STP Port Parameters:
Port number and STP state The internal port number and the port’s STP state.
The internal port number is one of the following:
•
The port’s interface number, if the port is the designated port for the LAN.
•
The interface number of the designated port from the received BPDU, if
the interface is not the designated port for the LAN.
The state can be one of the following:
•
BLOCKING – STP has blocked Layer 2 traffic on this port to prevent a loop.
The device or VLAN can reach the root bridge using another port, whose
state is FORWARDING. When a port is in this state, the port does not
transmit or receive user frames, but the port does continue to receive STP
BPDUs.
•
DISABLED – The port is not participating in STP. This can occur when the
port is disconnected or STP is administratively disabled on the port.
•
FORWARDING – STP is allowing the port to send and receive frames.
•
LISTENING – STP is responding to a topology change and this port is
listening for a BPDU from neighboring bridges in order to determine the
new topology. No user frames are transmitted or received during this
state.
•
LEARNING – The port has passed through the LISTENING state and will
change to the BLOCKING or FORWARDING state, depending on the results
of STP’s reconvergence. The port does not transmit or receive user frames
during this state. However, the device can learn the MAC addresses of
frames that the port receives during this state and make corresponding
entries in the MAC table.
NOTE: If the state is DISABLED, no further STP information is displayed for the
port.