Linksys SRW224G4P - Manual (Page 44)

Chapter  Configuring the Switch
40 24-Port 10/100 + 4-Port Ggabt Swtch wth WebVew and Power over Ethernet
Actvate Protocol Mgraton Test If at any time the
switch detects STP BPDUs, including Configuration or
Topology Change Notification BPDUs, it will automatically
set the selected interface to forced STP-compatible mode .
However, you can also use the Protocol Migration button
to manually re-check the appropriate BPDU format (RSTP
or STP-compatible) to send on the selected interfaces .
(Default: Dsabled)
Admnstratve Lnk Type The link type attached to this
interface .
Pont-to-Pont A connection to exactly one other
bridge .
Shared A connection to two or more bridges .
Auto The Switch automatically determines if the
interface is attached to a point-to-point link or to
shared media . This is the default setting .
Spanning Tree > MSTP Properties
Spanning Tree > MSTP Properties
When using STP or RSTP, it may be difficult to maintain
a stable path between all VLAN members . Frequent
changes in the tree structure can easily isolate some of
the group members . MSTP (which is based on RSTP for
fast convergence) is designed to support independent
spanning trees based on VLAN groups . Using multiple
spanning trees can provide multiple forwarding paths
and enable load balancing . One or more VLANs can be
grouped into a Multiple Spanning Tree Instance (MSTI)
This Switch supports 33 MSTI’s . MSTP builds a separate
Multiple Spanning Tree (MST) for each instance to
maintain connectivity among each of the assigned VLAN
groups . MSTP then builds a Internal Spanning Tree (IST)
for the Region containing all commonly configured MSTP
bridges .
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An MST Region consists of a group of interconnected
bridges that have the same MST Configuration
Identifiers (including the Region Name, Revision Level
and Configuration Digest) . An MST Region may contain
multiple MSTP Instances . An Internal Spanning Tree (IST)
is used to connect all the MSTP switches within an MST
region . A Common Spanning Tree (CST) interconnects all
adjacent MST Regions, and acts as a virtual bridge node
for communications with STP or RSTP nodes in the global
network .
MSTP connects all bridges and LAN segments with a
single Common and Internal Spanning Tree (CIST) . The
CIST is formed as a result of the running spanning tree
algorithm between switches that support the STP, RSTP,
MSTP protocols .
Regon Name The name for this MSTI . (Maximum length:
32 characters)
Revson The revision for this MSTI . (Range: 0-65535;
Default: 0)
Max Hops The maximum number of hops allowed in
the MST region before a BPDU is discarded . (Range: 1-40;
Default: 20)
IST Master An MD5 signature key that contains the VLAN
ID to MST ID mapping table . In other words, this key is a
mapping of all VLANs to the CIST .
Modify the required attributes for MSTP . Click Save
Settngs to save the changes .
Spanning Tree > MSTP Instance Settings
QoS > MSTP Instance Settings
MST ID Instance identifier to configure . (Range: 0-4094;
Default: 0)
VLAN ID VLAN to assign to this selected MST instance .
(Range: 1-4093)