Stp Introduction; Stp Configuration - UTStarcom iSpirit 3026 Manual

5.1 STP introduction

The iSpirit 3026 switch supports IEEE802.1d standard STP. STP is a Layer 2 protocol with
IEEE802.1d standard, it operates at the layer of Bridges and Switches. STP provides a method
to dynamically switch between redundant devices in the network. So with STP, user can plan
backup links when designing networks and STP will ensure that backup links are closed when
main links are working; and once main links break down, backup links will be activated
automatically to make sure the network still works.
From another point of view, STP can avoid loops when there are redundancy in the network
topology. On one hand, loops are critical problems for a network; On the other hand, to provide
redundancy is also very important. STP can solve this paradox. Users can have this functionality
through commands we provided.

5.2 STP configuration

Please refer to the following steps to configure STP:
(1) To enable STP;
(2) To configure STP.
By default, STP is closed on the switch, but STP calculation for all ports is on. A port will be
added to STP calculation only when both of STP for the whole switch and the STP calculation for
the port are on; Otherwise, it won't be added.
Commands:
To enable or disable STP under overall mode:
stp
no stp
To enable STP calculation of ports under overall mode:
enable stp ports <port|port1-port2> [port|port1-port2]...
To disable STP calculation of ports under overall mode:
disable stp ports <port|port1-port2> [port|port1-port2]...
To set bridge priority under overall mode, the default value is 32768, range: 0-65535:
stp bridge priority <priority>
To set port priority under PORT RANGE mode, the default value is 128, range: 0-255:
stp port priority <priority>