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Access Point Bridging Services

1-10 Introducing RoamAbout Access Point

Access Point Bridging Services

The Access Point provides the following bridging services:

•

Store-and-forward capability

The AP receives, checks, and transmits frames to other LANs, enabling the

configuration of extended LANs.

•

Frame filtering based on address

Using the address database and the source and destination addresses from

incoming frames, the AP’s forwarding and translating process module isolates the

traffic that should not be allowed on other LANs. This action reduces the total data

traffic on an extended LAN by not forwarding the packets that have local

destination addresses or packets that are not allowed to be forwarded. This

increases bandwidth efficiency.

•

Data Link layer relay

Operation at this layer makes the AP transparent to the protocols that use the LAN

connectivity service. This protocol transparency is a key factor in the extended

LAN service.

•

Dynamic address learning

The forwarding and translating process module automatically adds new source

addresses to the address database while the AP is operating. This reverse learning

of the address and port association allows automatic network configuration

without prior downline loading of configuration data to the AP. Note that the

address learning is protocol and management entity independent.

How long an address remains in the database is determined by an “Aging Timer”

that measures how much time has elapsed since data was last addressed to or from

a particular node. The timer is set to either 2 minutes or 32 minutes, depending on

whether the AP is operating in Full Bridge or Workgroup Bridge mode. If the

timer lapses without any traffic, the node’s address is removed from the database.

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Cabletron Systems RoamAbout Guía de usuario Pagina 22