ZyXEL ES-3124PWR User Guide - Page 115

Multiple Spanning Tree, Advanced Application > Spanning Tree Protocol &gt, Configuration

Page 115 highlights

Chapter 11 Spanning Tree Protocol The following table describes the labels in this screen. Table 31 Advanced Application > Spanning Tree Protocol > MSTP LABEL DESCRIPTION Status Click Status to display the MSTP Status screen (see Figure 62 on page 117). Active Select this to activate MSTP on the Switch. Clear this to disable MSTP on the Switch. Note: You must also activate Multiple Spanning Tree in the Advanced Application > Spanning Tree Protocol > Configuration screen to enable MSTP on the Switch. Hello Time This is the time interval in seconds between BPDU (Bridge Protocol Data Units) configuration message generations by the root switch. The allowed range is 1 to 10 seconds. MaxAge This is the maximum time (in seconds) a switch can wait without receiving a BPDU before attempting to reconfigure. All switch ports (except for designated ports) should receive BPDUs at regular intervals. Any port that ages out STP information (provided in the last BPDU) becomes the designated port for the attached LAN. If it is a root port, a new root port is selected from among the Switch ports attached to the network. The allowed range is 6 to 40 seconds. Forwarding Delay This is the maximum time (in seconds) a switch will wait before changing states. This delay is required because every switch must receive information about topology 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 blocking state; otherwise, temporary data loops might result. The allowed range is 4 to 30 seconds. As a general rule: Note: 2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1) Maximum hops Enter the number of hops (between 1 and 255) in an MSTP region before the BPDU is discarded and the port information is aged. Configuration Name Enter a descriptive name (up to 32 characters) of an MST region. Revision Number Enter a number to identify a region's configuration. Devices must have the same revision number to belong to the same region. Apply Click Apply to save your changes to the Switch's run-time memory. The Switch loses these changes if it is turned off or loses power, so use the Save link on the top navigation panel to save your changes to the non-volatile memory when you are done configuring. Cancel Click Cancel to begin configuring this screen afresh. Instance Use this section to configure MSTI (Multiple Spanning Tree Instance) settings. Instance Enter the number you want to use to identify this MST instance on the Switch. The Switch supports instance numbers 0-16. Bridge Priority Set the priority of the Switch for the specific spanning tree instance. The lower the number, the more likely the Switch will be chosen as the root bridge within the spanning tree instance. Enter priority values between 0 and 61440 in increments of 4096 (thus valid values are 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344 and 61440). ES-3124 Series User's Guide 115

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Chapter 11 Spanning Tree Protocol
ES-3124 Series User’s Guide
115
The following table describes the labels in this screen.
Table 31
Advanced Application > Spanning Tree Protocol > MSTP
LABEL
DESCRIPTION
Status
Click
Status
to display the
MSTP Status
screen (see
Figure 62 on page 117
).
Active
Select this to activate MSTP on the Switch. Clear this to disable MSTP on the
Switch.
Note: You must also activate
Multiple Spanning Tree
in the
Advanced Application > Spanning Tree Protocol >
Configuration
screen to enable MSTP on the Switch.
Hello Time
This is the time interval in seconds between BPDU (Bridge Protocol Data Units)
configuration message generations by the root switch. The allowed range is 1 to
10 seconds.
MaxAge
This is the maximum time (in seconds) a switch can wait without receiving a BPDU
before attempting to reconfigure. All switch ports (except for designated ports)
should receive BPDUs at regular intervals. Any port that ages out STP information
(provided in the last BPDU) becomes the designated port for the attached LAN. If it
is a root port, a new root port is selected from among the Switch ports attached to
the network. The allowed range is 6 to 40 seconds.
Forwarding Delay
This is the maximum time (in seconds) a switch will wait before changing states.
This delay is required because every switch must receive information about
topology 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 blocking
state; otherwise, temporary data loops might result. The allowed range is 4 to 30
seconds. As a general rule:
Note: 2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1)
Maximum hops
Enter the number of hops (between 1 and 255) in an MSTP region before the
BPDU is discarded and the port information is aged.
Configuration
Name
Enter a descriptive name (up to 32 characters) of an MST region.
Revision Number
Enter a number to identify a region’s configuration. Devices must have the same
revision number to belong to the same region.
Apply
Click
Apply
to save your changes to the Switch’s run-time memory. The Switch
loses these changes if it is turned off or loses power, so use the
Save
link on the
top navigation panel to save your changes to the non-volatile memory when you
are done configuring.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Instance
Use this section to configure MSTI (Multiple Spanning Tree Instance) settings.
Instance
Enter the number you want to use to identify this MST instance on the Switch. The
Switch supports instance numbers 0-16.
Bridge Priority
Set the priority of the Switch for the specific spanning tree instance. The lower the
number, the more likely the Switch will be chosen as the root bridge within the
spanning tree instance.
Enter priority values between 0 and 61440 in increments of 4096 (thus valid values
are 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960,
45056, 49152, 53248, 57344 and 61440).