SMC Networks 16 10BASE-T manual Spanning Tree Algorithm Configuration, Changing the Aging Time

Spanning Tree Algorithm Configuration 3

Changing the Aging Time

You can set the aging time for entries in the dynamic address table.

Command Attributes

•Aging Status – Enables/disables the function.

•Aging Time – The time after which a learned entry is discarded. (Range: 10-30000 seconds; Default: 300 seconds)

Web – Click Address Table, Address Aging. Specify the new aging time, click Apply.

Figure 3-54. Setting the Address Aging Time

CLI – This example sets the aging time to 400 seconds.

Console(config)#mac-address-table aging-time 400	4-132
Console(config)#

Spanning Tree Algorithm Configuration

The Spanning Tree Algorithm (STA) can be used to detect and disable network loops, and to provide backup links between switches, bridges or routers. This allows the switch to interact with other bridging devices (that is, an STA-compliant switch, bridge or router) in your network to ensure that only one route exists between any two stations on the network, and provide backup links which automatically take over when a primary link goes down.

The spanning tree algorithms supported by this switch include these versions:

•STP – Spanning Tree Protocol (IEEE 802.1D)

•RSTP – Rapid Spanning Tree Protocol (IEEE 802.1w)

STA uses a distributed algorithm to select a bridging device (STA-compliant switch, bridge or router) that serves as the root of the spanning tree network. It selects a root port on each bridging device (except for the root device) which incurs the lowest path cost when forwarding a packet from that device to the root device. Then it selects a designated bridging device from each LAN which incurs the lowest path cost when forwarding a packet from that LAN to the root device. All ports connected to designated bridging devices are assigned as designated ports. After determining the lowest cost spanning tree, it enables all root ports and designated ports, and disables all other ports. Network packets are therefore only forwarded between root ports and designated ports, eliminating any possible network loops.

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