Working with VSCs
Quality of service (QoS)
4-25
Differentiated Services (DiffServ)
This mechanism classifies traffic based on the value of the Differentiated Services (DS)
codepoint field in IPv4 and IPv6 packet headers (as defined in RFC2474). The codepoint is
composed of the six most significant bits of the DS field.
TOS
This mechanism classifies traffic based on value of the TOS (Type of Service) field in an IP
packet header.
IP QoS
This option lets you assign traffic to the queues based on the criteria in one or more IP QoS
profiles. Each profile lets you target traffic on specific ports or using specific protocols.
Disabled
When QoS traffic prioritization is disabled, all traffic is sent to queue 3.
Upstream DiffServ tagging
Enable this option to have the M111 apply differentiated services marking to upstream traffic.
Layer 3 upstream marking ensures end-to-end quality of service in your network. Data
originating on the wireless network can now be carried throughout the network (wireless
and wired) with a consistent quality of service and priority. This feature is enabled by default.
When this feature is enabled, packets received on the wireless interface that include Wi-Fi
Multimedia (WMM) QoS values are remarked using IP TOS/DiffServ values when transmitted
to the wired network.
Queue DiffServ (DS codepoint value)
1 111000 (Network control)
110000 (Internetwork control)
2 101000 (Critical)
100000 (Flash override)
3 011000 (Flash)
000100 (Routine)
4 010000 (Immediate)
001000 (Priority)
Queue TOS (Type of Service field value)
1 0x30, 0xE0, 0x88, 0xB8
2 0x28, 0xA0
3 0x08, 0x20
4 All other TOS traffic
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