LevelOne GTL-2881, User Manual

Page: 204 / 706

Chapter 7
| Spanning Tree Algorithm
Configuring Global Settings for STA
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changes before it starts to forward frames. In addition, each port needs time to
listen for conflicting information that would make it return to a discarding
state; otherwise, temporary data loops might result.
■
Default: 15
■
Minimum: The higher of 4 or [(Max. Message Age / 2) + 1]
■
Maximum: 30
RSTP does not depend on the forward delay timer in most cases. It is able to
confirm that a port can transition to the forwarding state without having to rely
on any timer configuration. To achieve fast convergence, RSTP relies on the use
of edge ports, and automatic detection of point-to-point link types, both of
which allow a port to directly transition to the forwarding state.
Configuration Settings for MSTP
◆
Max Instance Numbers – The maximum number of MSTP instances to which
this switch can be assigned.
◆
Configuration Digest – 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.
◆
Region Revision 6 – The revision for this MSTI. (Range: 0-65535; Default: 0)
◆
Region Name
6
– The name for this MSTI. (Maximum length: 32 characters;
Default: switch’s MAC address)
◆
Max Hop Count – The maximum number of hops allowed in the MST region
before a BPDU is discarded. (Range: 1-40; Default: 20)
N
OTE
:
Region Revision and Region Name and are both required to uniquely
identify an MST region.
Web Interface
To configure global STA settings:
1.
Click Spanning Tree, STA.
2.
Select Configure Global from the Step list.
3.
Select Configure from the Action list.
4.
Modify any of the required attributes. Note that the parameters displayed for
the spanning tree types (STP, RSTP, MSTP) varies as described in the preceding
section.
6. The MST name and revision number are both required to uniquely identify an MST region.