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Using Source Routing Bridge Services

117351-B Rev. 00

2-3

Figure 2-2. Source Routing Designator

After the bridge adds the routing designator, it sends the frame out all ports (flood

the frame). If there are parallel bridges between LANs, multiple copies of the

same ARE frame can appear on a LAN, and the frame recipient can receive

multiple copies of the frame (one copy for each possible path through the

extended network).

Each ARE frame received by the destination end station contains a unique

sequenced list of routing designators tracing the frame’s path through the source

routing network.

Spanning Tree Broadcast Routing

An end station configured for spanning tree broadcast routing generates a single

frame that follows a loop-free path from source to destination. This frame is an

STE.

When an end station generates an STE frame, each bridge on the spanning tree

forwards the frame onto all active (nonblocked) ports, except the port that received

the frame. With spanning tree broadcast routing, one copy of the STE appears on

each LAN and the frame recipient receives a single copy only. For more

information on the spanning tree algorithm, see Chapter 1.

Note:

In a looped topology, the originating bridge may receive the ARE

frame; the originating bridge discards the frame.

001A 100A 0020 Data...

Incoming ring ID

Internal LAN ID/bridge ID

Outgoing ring ID

BRG0012A

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 259 260

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Avaya Configuring Bridging Services Manual de usuario Pagina 61