Multiple Instance Spanning-Tree Operation; Overview - HP ProCurve Switch 6120G/XG Management Manual

N o t e

Overview

The switches covered in this guide, use the IEEE 802.1s Multiple Spanning
Tree Protocol (MSTP) standard.
MSTP Features
802.1s Spanning Tree Protocol
Viewing MSTP Status and Configuration
Configuring MSTP Operation Mode and
Global Parameters
Configuring Basic Port Connectivity
Parameters
Configuring MSTP Instance Parameters
Configuring MSTP Instance Per-Port
Parameters
Enabling/Disabling MSTP Spanning Tree
Operation
Enabling an Entire MST Region at Once
Without spanning tree, having more than one active path between a pair of
nodes causes loops in the network, which can result in duplication of mes-
sages, leading to a "broadcast storm" that can bring down the network.
MSTP cannot protect against loops when there is an unmanaged device on the
network that drops spanning tree packets, or may fail to detect loops where
this is an edge port configured with client authentication (802.1X, Web and
MAC authentication). To protect against the formation of loops in these cases,
you can use the loop protection feature (see "Loop Protection" on page 4-70).

Multiple Instance Spanning-Tree Operation

Default Setting
n/a
Disabled
admin-edge-port: No-disabled
auto-edge-port: Yes-enabled
bpdu-filter: No-disabled
bpdu-protection: No-disabled
hello-time: 2
path-cost: auto
point-to-point MAC: Force-True
priority: 128 (multiplier: 8)
root-guard: No-disabled
tcn-guard: No-disabled
loop protection: Send disable
instance (MSTPI): none
priority: 32768 (multiplier: 8)
path-cost: auto
priority: 128 (multiplier: 8)
Disabled
n/a

Overview

Page Ref
page 4-49
page 4-21
and
following
page 4-26
and
following
page 4-35
page 4-37
page 4-40
page 4-40
4-3