XS26GS Managed Optical Ethernet Switch User Manual
39
Static Trunking Group
: shows static trunk information, including
Trunk ID
,
Trunk
Name
,
Type
, and
Port List
.
Type
is fixed to
Static
.
LACP Trunking Group
: shows LACP trunk information, including
Priority
,
MAC
of Actor
and Partner. It also shows the
Key
, priority,
Active
state of member ports.
2.12
Spanning Tree
Spanning Tree Protocol (STP) is a standard protocol described in IEEE 802.1D. Rapid
Spanning Tree Protocol (RSTP, IEEE 802.1w) is an evolution of the 802.1D. Multiple
Spanning Tree Protocol (MSTP, IEEE 802.1s) is also an evolution of the 802.1D.
2.12.1
Global
Before configuring STP, make sure STP is enabled (see section 2.2 of this manual for
details). There is one tag page:
2.12.1.1
Configuration
This page sets bridge configurations
:
Mode
,
Max Hops
,
Hello Time
,
Max Age
,
Forward Delay Time
,
Priority, and BPDU Guard
.
Mode:
Three spanning tree modes are supported: stp, rstp, and mstp.
Max Hops:
this value is in the range from 1 to 20, and is 20 by default.
This parameter is used in MSTP mode only to limit the size of MST domain, and the root
switch of the instance always sends a BPDU (or M-record) with a cost of 0 and the hop
count of the maximum value. When a switch receives this BPDU, it decrements the
received remaining hop count by one and propagates this value as the remaining hop
count in the BPDUs it generates. When the count reaches zero, the switch discards the
BPDU and ages the information held for the port. By default, this value is set to 20.
Hello Time
: this value is in the range from 1 to 10 seconds, and is 2 seconds by default.
A root bridge regularly sends out configuration BPDUs to maintain the stability of the
existing spanning tree. If the switch does not receive a BPDU packet in a specified period,