Madge Networks Token Ring Switch Manuel d'utilisateur télécharger pdf (Page 53)

Smart DeskStream Technical Presentation 53

Use BRF to set one of the ports to a different ring

number

This is a legal configuration - both uplinks will be

active

n Load sharing, resilient connectivity

Source Route Switching

Introducing multiple uplinks - 3

101

BRF

Ring Number 102

Active

Dual uplinks to the same backbone switch

This is an illegal configuration - two ports on the

same switch cannot connect to the same ring

If middle DeskStream fails, both DeskStreams

retain backbone connectivity

What do we need the BRF for?

One use is in resilient networks. The DeskStream replaces the

shared medium hubs which are often connected to two backbone

switches to ensure a connection.

As we have seen, connecting two CRF ports to one Ringswitch is an

illegal configuration and will fail. If we need to connect this way -

perhaps to ensure maximum connectivity for a DeskStream stack if

one fails catastrophically - then the BRF with a different ring number

makes this an allowable configuration.

We will need to manage the path costs to ensure that standby (SR)

or blocking (Transparent) ports are in the Ringswitch.

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Madge Networks Token Ring Switch Manuel d'utilisateur Page 53