ZyXEL Communications ES3500 Series Port, Name, LABEL, rule:, Apply, Status, Active, in the, MaxAge, Cancel, Cancel, seconds, Instance, Instance, Hello Time, DESCRIPTION, Maximum hops

Chapter 13 Spanning Tree Protocol

The following table describes the labels in this screen.

Table 38 Advanced Application > Spanning Tree Protocol > MSTP

LABEL	DESCRIPTION
Port	Click Port to display the MSTP Port Configuration screen (see Figure 69 on page 139).
Status	Click Status to display the MSTP Status screen (see Figure 70 on page 140).
Active	Select this check box to activate MSTP on the Switch. Clear this checkbox 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	Enter a descriptive name (up to 32 characters) of an MST region.
Name
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).

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ES3500 Series User’s Guide