Madge Networks Token Ring Switch Manuel d'utilisateur télécharger pdf (Page 42)

Smart DeskStream Technical Presentation 42

Source Route Switching

‘Annex K’

n Components of Annex K ?

n Concentrator Relay Function (CRF)

l Handles switching process

l All ports access the network using the same ring

number (source routing)

l Includes all ports (by default) within a stack of

DeskStreams

n Bridge Relay Function (BRF)

l Allows bridging between CRF and ports on different

ring numbers

l Equivalent to an IEEE SRT switch

The CRF manages all the basic ports including a ‘virtual’ port which

gives a link to the BRF interface and any ports which have been

transferred to that interface.

Ports within the CRF all use the same ring number (although they are

not in a ring - this is a switched environment). This allows an SR

frame (in an SR network) to find the correct DeskStream stack; the

CRF will sort out, from its Address/Descriptor table, which port to

pass the frame to.

The BRF allows us to take some ports out of the CRF and assign a

different ring number to each. The BRF manages the switching

between these ports and - via the CRF - to the basic ports.

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Madge Networks Token Ring Switch Manuel d'utilisateur Page 42