Cabletron Systems MMAC-Plus 9T122-24 User Manual download pdf (Page 19)

3-3

Bridging

2. The receiving bridges append their own route information to the Route

Information Field (RIF) in the MAC frame header and transmit the frame

again.

3. Eventually, the original source device receives all of the ARE replies from the

other end stations on the network.

4. From this information, the source device can determine a desired route for

each frame it transmits.

Spanning Tree Algorithm

The 9T122-24 promotes maximum network use in multiple bridge environments.

A bridge learns the bridge topology of its network from bridge protocol data that

it receives from other bridges within the network. The bridges then apply the

Spanning Tree Algorithm (STA) to select a root bridge, and then determine

primary data paths within potential data loop conﬁgurations.

Spanning Tree Algorithm is a hierarchy (or tree) of priorities that bridges establish

between themselves. This hierarchy guarantees that primary and redundant data

paths are clearly deﬁned at all times, so that the network is continuously available

to users.

In a multiple bridge environment, one bridge in the network establishes itself as

the root bridge. As the root, this bridge has priority over all other bridges. In a

Spanning Tree, all of the bridges must determine which bridge is the root, and

then determine their own relative priority within the network.

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Cabletron Systems MMAC-Plus 9T122-24 User Manual Page 19