Alcatel 9000 Betriebsanweisung PDF herunterladen (Seite 528)

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QoS Ports and Queues Configuring QoS

page 26-22 OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006

Configuring the Egress Queue Minimum/Maximum Bandwidth

Configuring a minimum and maximum bandwidth value for each of the eight egress port queues is

allowed on the OmniSwitch 6850 and 9000 but is not supported on the OmniSwitch 6800. By default the

bandwidth values are set to zero, which means best effort for the minimum bandwidth and port speed for

the maximum bandwidth.

To configure the bandwidth values use the qos port q minbw maxbw command. For example, the follow-

ing command sets the minimum and maximum bandwidth for queue 8 on port 2/10 to 2k and 10k:

-> qos port 2/10 q8 minbw 2k q8 maxbw 10k

Note that specifying both the minimum and maximum bandwidth value is allowed on the same command

line. Configuring the bandwidth values for different queues requires a separate command for each queue.

Trusted and Untrusted Ports

By default switch ports are not trusted; that is, they do not recognize 802.1p or ToS/DSCP settings in

packets of incoming traffic. When a port is not trusted, the switch sets the 802.1p or ToS/DSCP bits in

incoming packets to the default 802.1p or DSCP values configured for that port.

The qos port default 802.1p and qos port default dscp commands are used to specify the default 802.1p

and ToS/DSCP values. If no default is specified, then these values are set to zero.

Note that on the OmniSwitch 6800 Series switch, the 802.1p bit for tagged packets received on untrusted

ports is set with the default 802.1p value. If the packet is untagged, however, then the DSCP bit is set with

the default DSCP value.

Fixed ports that are configured for 802.1Q are always trusted, regardless of QoS settings. They cannot be

configured as untrusted. For more information about configuring 802.1Q for fixed ports, see Chapter 11,

“Configuring 802.1Q.”

Mobile ports are also always trusted; however, mobile ports may or may not accept Q-tagged traffic.

Note about mobile ports. Mobile ports cannot be Q-tagged like fixed ports; however, a mobile port will

join a tagged VLAN if tagged traffic for that VLAN comes in on the mobile port and the vlan mobile-tag

command is enabled for that VLAN. For more information about enabling this command, see Chapter 5,

“Configuring VLANs.”

Ports must be both trusted and configured for 802.1Q traffic in order to accept 802.1p traffic.

The following applies to ports that are trusted (for 802.1p traffic, the ports must also be able to accept

802.1Q packets):

• The 802.1p or ToS/DSCP value is preserved.

• If the incoming 802.1p or ToS/DSCP flow does not match a policy, the switch places the flow into a

default queue and prioritizes the flow based on the 802.1p or ToS/DSCP value in the flow.

• If the incoming 802.1p or ToS/DSCP flow matches a policy, the switch queues the flow based on the

policy action.

The switch may be set globally so that all ports are trusted. Individual ports may be configured to override

the global setting.

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