Linksys SRW224G4P manual Spanning Tree STP Port Settings STP Port Setting Detail

Chapter 5 Configuring the Switch

The Port Information displays the current status of the ports in the Spanning Tree..

Port  Displays the port number..

State  Shows if Spanning Tree has been enabled on this interface.. To enable STP on a port click the state checkbox for that port then click Save Settings to save the changes..

Status  Displays current state of this port within the Spanning Tree:

•Discarding  Port receives STA configuration messages, but does not forward packets..

•Learning  Porthastransmittedconfigurationmessages for an interval set by the Forward Delay parameter without receiving contradictory information.. Port address table is cleared, and the port begins learning addresses..

•Forwarding  Port forwards packets, and continues learning addresses..

Role  Roles are assigned according to whether the port is part of the active topology connecting the bridge to the root bridge (i..e.., root port), connecting a LAN through the bridge to the root bridge (i..e.., designated port), or is the MSTI regional root (i..e.., master port); or is an alternate or backup port that may provide connectivity if other bridges, bridge ports, or LANs fail or are removed.. The role is set to disabled (i..e.., disabled port) if a port has no role within the spanning tree..

Forward Transitions  The number of times this port has transitioned from the Learning state to the Forwarding state..

Operational Edge Port  This parameter is initialized to the setting for Administrative Edge Port in STP Port Setting detail, but will be set to false if a BPDU is received indicating that another bridge is attached to this port..

Click on Detail to configure STP Port Settings for an interface..

Click Detail to configure Path Cost, Priority, Administrative Edge Port (Fast Forwarding), and Administrative Link Type.. Use the text fields provided to edit the values, then click Apply..

Spanning Tree > STP Port Settings > STP Port Setting Detail

Designated Cost  The cost for a packet to travel from this port to the root in the current SpanningTree configuration.. The slower the media, the higher the cost..

Designated Port  The port priority and number of the port on the designated bridging device through which the Switch must communicate with the root of the Spanning Tree..

Designated Bridge  The bridge priority and MAC address of the device through which this port must communicate to reach the root of the Spanning Tree..

Path Cost  This parameter is used by the STP to determine the best path between devices.. Therefore, lower values should be assigned to ports attached to faster media, and higher values assigned to ports with slower media.. (Path cost takes precedence over port priority..)

NOTE: When the Path Cost Method is set to “short,” the maximum path cost is 65,535..

Range –

Ethernet: 200,000-20,000,000

Fast Ethernet: 20,000-2,000,000

Gigabit Ethernet: 2,000-200,000 Default –

Ethernet – Half duplex: 2,000,000; full duplex: 1,000,000;

LAG: 500,000

Fast Ethernet – Half duplex: 200,000; full duplex: 100,000;

LAG: 50,000

Gigabit Ethernet – Full duplex: 10,000; LAG: 5,000

24-Port 10/100 + 4-Port Gigabit Switch with WebView and Power over Ethernet 38