User's Manual

Technical Notes – QoS Features on BES50

When BES50 is used in a customer premises network with BCM50/BCM450 and QoS treatment is required, it is

recommended to use the IP DSCP traffic prioritization method (see “3. Traffic prioritization based on IP DSCP”

on page 15) on BES50 since BCM does not tag outgoing Ethernet frames. It is also recommended not to enable

IP DSCP re-marking on BES50 so all QoS capable devices within the customer premise network will apply the

same DiffServ QoS behaviour to the IP packets passing through the network. Typically DSCP is re-marked if

necessary when IP packets traverse across DiffServ boundary. BES50 is a layer 2 device, re-marking DSCP is

better off performed by a layer 3 router (or gateway) locating at the edge of two DiffServ boundary.