Allied Telesis AT-GS950/8 manual Increment Port Priority

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AT-S82 Management Software User’s Guide

trunk.

Table 7. RSTP Auto Port Trunk Costs

Port Speed	Port Cost


10 Mbps	20,000

100 Mbps	20,000

1000 Mbps	2,000

You cannot set the port cost manually.

Port Priority

If two paths have the same port cost, the bridges must select a preferred path. In some instances this can involve the use of the port priority parameter. This parameter is used as a tie breaker when two paths have the same cost.

The range for port priority is 0 to 240. As with bridge priority, this range is broken into increments, in this case multiples of 16. Table 8 lists the valid port priority values. The default value is 128, which is increment 8.

Table 8. Port Priority Value Increments

Increment	Port		Increment	Port
Increment	Priority		Increment	Priority
	Priority			Priority


0	0		8	128

1	16		9	144

2	32		10	160

3	48		11	176

4	64		12	192

5	80		13	208

6	96		14	224

7	112		15	240

Forwarding Delay and Topology Changes

If there is a change in the network topology due to a failure, removal, or addition of any active components, the active topology also changes. This may trigger a change in the state of some blocked ports. However, a change in a port state is not activated immediately.

It might take time for the root bridge to notify all bridges that a topology

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Contents Management Software Page Contents Contents Figures Figures Preface Where to Find Web-based Guides Contacting Allied Telesis Management Software UpdatesPreface Chapter Getting StartedStarting a Management Session Main Saving Changes Save Configuration Click ApplyQuitting a Management Session Getting Started Basic Switch Parameters Basic Switch Parameters AT-S82 Management Software User’s Guide Disabling or Enabling Ping Blocking EnabledDisabled Enabling or Disabling 802.1X Forwarding Control Changing the Administrator’s Password Rebooting the Switch Reset Click Apply Switch is reset Resetting the Switch and Retaining the IP AddressAT-S82 Management Software User’s Guide Download Status Message Downloading New FirmwarePort Configuration Configuring Port Parameters Port is enabled. This is the default Fiber CopperTrunking Trunking Guidelines Trunking Algorithm Trunking OverviewAT-S82 Management Software User’s Guide DAxorSA Configuring the Trunking AlgorithmPort Trunking Configuration Setting up the TrunkTrunking Port Mirroring Port Mirroring Overview Configuring Port Mirroring Port Mirroring VLANs Increased Performance Improved Manageability Security Vlan FeaturesAT-S82 Management Software User’s Guide Vlan Identifier Vlan Port Members Vlan OverviewIncoming Outgoing Tagged Untagged Frames Guidelines for Creating a Vlan Vlan Detail Working with VLANsClick Show All Static Vlan Entries Displaying all VLANsVlan Protected Ports Vlan Example Protected Ports VlanAT-S82 Management Software User’s Guide VLANs Class of Service Mapping Ports to Egress Queues Class of Service OverviewIeee 802.1p Priority Level Port Priority Queue Port Egress Queue Maximum Number Packets Mapping Priorities to Queues Setting Up the Schedule Assigning Priority to Ports Class of Service Spanning Tree Protocol STP Bridge Priority Root Spanning Tree OverviewIncrement Bridge Priority Path Costs and Port CostsPort Speed Port Cost Increment Port Priority Port PriorityHello Time and Bridge Protocol Data Units BPDUs Point-to-Point and Edge Ports Edge Port Spanning Tree and VLANs Spanning Tree Protocol STP Configuring Spanning Tree STP Compatible RstpDisabled Configuring STP Port Settings False YesTrue AutoSpanning Tree Protocol STP

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