Qtech QSW-8200-28T-AC — qoS Commands Guide: Configuration and Usage Examples [14/38]

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User Manual

Chapter 1. Commands for QoS 14

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 Switch(config)#interface ethernet 1/0/1

 Switch(config-if-ethernet1/0/1)#mls qos trust dscp

 Switch(config-if-ethernet1/0/1)#pass-through-cos

1.21 pass-through-dscp

 Command: pass-through-dscp

 no pass-through-dscp

 Function: Forbid the egress packets rewriting DSCP value.

 Parameter: None.

 Default: The egress packets rewrite DSCP value.

 Command Mode: Port Mode

 Usage Guide: The egress packets can not rewrite DSCP value when configuring pass-

through-dscp on the ingress. This command may associate with other commands of

QoS, such as mls qos trust command. After QoS actions are valid, the egress packets

save the original DSCP value.

 Example: Configuring ethernet port 1/0/1 to trust CoS value, i.e., classifying the packets

according to CoS value.

 Switch(config)#interface ethernet 1/0/1

 Switch(config-if-ethernet1/0/1)#mls qos trust cos

 Switch(config-if-ethernet1/0/1)#pass-through-dscp

1.22 policy

 Command:

 Single Bucket Mode:

 policy <bits_per_second> <normal_burst_bytes> ({exceed-action ACTION} )

 Dual Bucket Mode:

 policy <bits_per_second> <normal_burst_bytes> [pir <peak_rate_bps>] |

<maximum_burst_bytes> [{exceed-action ACTION | violate-action ACTION }]

 ACTION definition:

 drop | transmit | set-internal-priority <intp_value> | policied-intp-transmit

 no policy

 Function: The non-aggregation policy command supporting three colors. Determine

whether the working mode of token bucket is singe rage single bucket, single rate dual

bucket or dual rate dual bucket, set the corresponding action to the different color

packets. The no command will delete the mode configuration.

 Parameters: bits_per_second: The committed information rate – CIR (Committed

Information Rate), in Kbps, ranging from 1 to 10000000;