Ruckus Wireless Ruckus ICX 7150 Series, Руководство по настройке

Страница: 22 / 65

TABLE 10 DSCP and PCP remarking
DSCP Remarking set Remarking set Not set
CoS Remarking set Not set Remarking set
DSCP action Remark DSCP at the ingress Remark DSCP at the ingress N/A
PCP action Remark PCP at the egress N/A Remark PCP at the egress
Traffic class Apply the TC equivalent to DSCP Apply the TC equivalent to DSCP Apply the TC equivalent to PCP
DSCP-based QoS configuration
Ruckus FastIron releases support basic DSCP-based QoS (also called Type of Service [ToS]-based QoS). However, the FastIron family of
switches does not support other advanced DSCP-based QoS features.
Ruckus FastIron releases also support marking of the DSCP value. The software can read Layer 3 Quality of Service (QoS) information in an
IP packet and select a forwarding queue for the packet based on the information. The software interprets the value in the six most
significant bits of the IP packet header 8-bit ToS field as a DSCP value, and maps that value to an internal forwarding priority.
NOTE
MAC filter and DSCP marking cannot be configured on the same port.
The internal forwarding priorities are mapped to one of the eight forwarding queues (qosp0 through qosp7) on the Ruckus device. During a
forwarding cycle, the device gives more preference to the higher-numbered queues, so that more packets are forwarded from these
queues. For example, queue qosp7 receives the highest preference, while queue qosp0, the best-effort queue, receives the lowest
preference.
Application notes for DSCP-based QoS
• DSCP-based QoS is not automatically honored for routed and switched traffic. The default is 802.1p to CoS mapping. To honor
DSCP-based QoS, you must either use an ACL or enable trust DSCP. .
• When DSCP marking is enabled, the device changes the contents of the inbound packet ToS field to match the DSCP-based QoS
value.
Using ACLs to honor DSCP-based QoS
This section shows how to configure Ruckus devices to honor DSCP-based QoS for routed and switched traffic.
Ruckus ICX 7750 devices support DSCP-based QoS on a per-port basis. DSCP-based QoS is not automatically honored for switched
traffic. The default is 802.1p to CoS mapping. To honor DSCP-based QoS, you must enter the
trust dscp
command at the interface level of
the CLI.
When the
trust dscp
command is enabled, the interface honors the Layer 3 DSCP value. By default, the interface honors the Layer 2 CoS
value.
NOTE
On Ruckus ICX 7750 or 7650 devices, configuring the
trust dscp
command to honor DSCP-based QoS classification on the
ingress port works on all traffic except GRE tunnels; classification on these remains based on Layer 2 (802.1p) trust. For GRE
tunnels, you can use ACLs to configure classification based on the DSCP value.
Quality of Service
DSCP-based QoS configuration
Ruckus FastIron QoS and Traffic Management Configuration Guide, 08.0.70
22 Part Number: 53-1005294-01