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Configuring the Switch
Web – Click Address Table, Address Aging. Specify the new aging time, click
CLI – This example sets the aging time to 400 seconds.
Console(config)#mac-address-table aging-time 400
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. 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. It then selects a port
on the designated bridging device to communicate with each attached LAN or
host device as a designated port. 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.
Designated
Root
x
x
Once a stable network topology has been established, all bridges listen for Hello
BPDUs (Bridge Protocol Data Units) transmitted from the Root Bridge.
3-76
x
Designated
Bridge
Apply
4-124
x
Root
Designated
Port
Port
x
.
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