ZyXEL Communications manual MSAP2000 Aams User’s Guide Switch Setup

MSAP2000 AAMS User’s Guide

Table 11 Switch Setup (continued)

LABEL	DESCRIPTION
Leave All Timer	Leave All Timer sets the duration of the Leave All Period timer for GVRP in
	milliseconds. Each port has a single Leave All Period timer. Leave All Timer
	must be larger than Leave Timer.
Port Isolation	Turn on port isolation to block communications between subscriber ports.
	When you enable port isolation you do not need to configure the VLAN to
	isolate subscribers.
Switch Mode	Select Standalone to use both of the MSAP2000 AAMS’s Ethernet ports (LAN
	1 and LAN 2) as uplink ports.

Note: Standalone mode is recommended for network topologies that use loops.

Use Daisychain mode to cascade (daisychain) multiple MSAP2000 AAMSs. The MSAP2000 AAMS uses Ethernet port one (LAN 1) as an uplink port to connect to the Ethernet backbone and uses Ethernet port two (LAN 2) to connect to another (daisychained or subtending) MSAP2000 AAMS.

Note: Daisychain mode is recommended for network topologies that do not use loops.

Priority Queue Assignment

IEEE 802.1p defines up to 8 separate traffic types by inserting a tag into a MAC-layer frame that contains bits to define class of service. Frames without an explicit priority tag are given the default priority of the ingress port. Use the next two fields to configure the priority level-to- physical queue mapping.

The switch has 4 physical queues that you can map to the 8 priority levels. On the switch, traffic assigned to higher index queues gets through faster while traffic in lower index queues is dropped if the network is congested.

See also Queuing Method and Priority in Port Setup for related information.

Priority Level (The following descriptions are based on the traffic types defined in the IEEE 802.1d standard (which incorporates IEEE 802.1p).

Level 7	Typically used for network control traffic such as router configuration
messages. Level 6	Typically used for voice traffic that is especially sensitive to jitter (jitter is the
	variations in delay).
Level 5	Typically used for video that consumes high bandwidth and is sensitive to jitter.
Level 4	Typically used for controlled load, latency-sensitive traffic such as SNA (Systems
	Network Architecture) transactions.
Level 3	Typically used for “excellent effort” or better than best effort and would include
	important business traffic that can tolerate some delay.
Level 2	This is for “spare bandwidth”.
Level 1	This is typically used for non-critical “background” traffic such as bulk transfers
	that are allowed but that should not affect other applications and users.
Level 0	Typically used for best-effort traffic.
Apply	Click Apply to save your changes to the MSAP2000 AAMS’s volatile memory.
	The MSAP2000 AAMS loses these changes if it is turned off or loses power, so
	use the Config Save link on the 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.

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