R S T P C O N F I G U R A T I O N V I A T E L N E T
Rev H
159 of 244
18
RSTP Configuration via
Telnet/CLI
NOTE
The RSTP feature is available on the GW-282/282S/482S/483S/483D products
only.
The Spanning Tree Algorithm and Protocol are part of the ANSI/IEEE Std 802.1D MAC
Bridges specifications sponsored by the LAN/MAN Standards Committee of the IEEE
Computer Society.
Spanning-Tree Protocol (STP) provides fault tolerance on networks, by allowing you to
implement parallel paths for network traffic. The algorithm creates a spanning tree (a loop-
free subset of the network topology) which enables a learning bridge to dynamically work
around loops in a network topology. STP allows you to implement redundant paths that are
enabled only when the main paths fail.
Rapid Spanning Tree Protocol (RSTP) performs the roles of the STP protocol considerably
faster by enabling rapid transitions of ports from Alternate state to Root state, and from
Backup state to
Designated
state. In certain cases, RSTP enables rapid transitions of ports to
Forwarding states.
RSTP is based on IEEE Std 802.1w and is part of
Amendment 2: Rapid Reconfiguration
to
IEEE Std 802.1D and IEEE Std 802.1t-2001.
RSTP assigns to each bridge port throughout the Bridged Local Area Network one of the roles
summarized in
Table 17-1 RSTP Port Role Assignments
Port Role
Definition
Root Port
Port connected to the root bridge/switch. State:
forwarding
and
link
enabled
.
Designated Port
Port connected to the designated switch - the switch closest to the
root switch. Frames are forwarded to the root through the designated
switch.
Alternate Port
Port that offers a path to the root bridge/switch alternate to the path
provided by the Root Port. The Alternate Port can replace the current
root port if link failure or a configuration change such as port priority
change occurs. State:
discarding
and
link enabled
.
Backup Port
Backup for the path provided by a Designated Port in the direction of
the leaves of the Spanning Tree. Points away from the root. State:
discarding
and
link enabled
.
Disabled Port
Blocked port. State:
discarding
and
link disabled
.
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