ProSafe 7000 Managed Switch Software Administration Manual, Release 8.0.3
23-1
Spanning Tree Protocol
v1.0, June 2010
Chapter
23
Spanning Tree Protocol
In this chapter, the following examples are provided:
•
“Configure Classic STP (802.1d)”
•
“Configure Rapid STP (802.1w)” on page
23-3
•
“Configure Multiple STP (802.1s)” on page
23-4
The purpose of spanning tree is to eliminate the loops in the switch system. There are three STPs: Classic
STP (802.1d), Rapid STP (RSTP, 802.1w), and Multiple STP (MSTP, 802.1s).
While STP can take 30 to 50 seconds to respond to a topology change, RSTP is typically able to respond to
changes within a few seconds. RSTP can revert back to 802.1d in order to interoperate with legacy bridges
on a per-port basis. This drops the benefits it introduces.
In Multiple Spanning Tree Protocol (MSTP), each Spanning-Tree instance can contain several VLANs.
Each Spanning-Tree instance is independent of other instances. This approach provides multiple forwarding
paths for data traffic, enabling load balancing, and reducing the number of Spanning-Tree instances required
to support a large number of VLANs.
Configure Classic STP (802.1d)
The example is shown as CLI commands and as a Web interface procedure.
CLI: Configuring Classic STP (802.1d)
(Netgear Switch) (Config)# spanning-tree
(Netgear Switch) (Config)# spanning-tree forceversion 802.1d
(Netgear switch) (Interface 1/0/3)# spanning-tree port mode
Web Interface:Configuring Classic STP (802.1d)
To use the Web interface to configure the managed switch, proceed as follows:
1.
Enable 802.1d on the switch.