Cambium Networks cnReach N500 Handleiding (253 Pagina's)

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cnReach N500 User Guide

Technical Reference

phn-4673_002v000 (March 2018)

3-35

Roaming Feature (ISM only)

The roaming feature allows a mobile or fixed EP radio to seamlessly switch

association between upstream radios as necessary to maintain the best possible link.

It has been tested to support Mobility speed of up to 30 miles. Currently, roaming is

only supported by ISM mode, with frequency hopping.

Roaming is implemented at the RF layer. Additional consideration must be taken at

the Ethernet layer for traffic to be routed properly during handover. An Ethernet

switch will maintain a FDB (forwarding database) which is populated from learning of

traffic flow to keep track of which port to forward the Ethernet traffic. As an EP is

roaming from one AP (e.g. AP1) to another AP (e.g. AP2), the switch is not aware of

the situation and will continue to forward traffic targeting the EP via the original AP

(e.g. AP1). If the network is converged with more than one AP, the payload devices

behind the EP needs to initiate traffic to trigger the switch to re-learn/update the

FDB.

The following diagram showed a roaming scenario where the network is converged

at two APs, so FDB update should be considered.

There are two other scenarios where FDB update will not be a concern.

1. Roaming with Back-to-back repeaters

The following diagram showed a roaming EP with network converged to a single AP, back-to-back

repeaters are distributed among the areas but all converged to a single AP. Notice that roaming is

only turned on for network 2222, but not for network 1111.

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