User's Manual

MDS 05-6302A01, Rev. B MDS Mercury 16E Technical Manual 29
QOS Example: Prioritizing a Data Flow
In order to prioritize one traffic flow over another, the service flow
priority should be used. In this example, there are two VLANs on the
trunk at the Base Station. Suppose the user wants to treat traffic on
VLAN 5 as higher priority than traffic on VLAN 6 in the event of heavy
network traffic or congestion. To accomplish this, uplink and downlink
service flows are created that classify on VLAN ID, assigning a higher
priority to VLAN 5's service flows. The following dialog box shows the
configuration for the VLAN 5 uplink service flow. A second service
flow should be created identical to this one for the downlink.
1. Use a MAC address of FF:FF:FF:FF:FF:FF to ensure that the service
flow can be used by any subscriber. (If using all F’s, a maximum of
13 entries is allowed.)
2. Set a low minimum rate to increase the chances that both service
flows will be allocated bandwidth in the event of network conges-
tion.
3. Set Filter 1 to the appropriate VLAN ID to restrict each service flow
to the desired VLAN.
4. Set the priority of VLAN 5's service flows to a higher priority than
VLAN 6's service flows.
5. A service flow is needed for uplink and downlink traffic for each
VLAN.
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Figure 19. Edit Service Flow Screen (VLAN 5)