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Configuration Guide - QoS

CloudEngine 12800 and 12800E V200R003C00

This document describes the configurations of QoS functions, including MQC, priority mapping, traffic policing, traffic shaping, interface-based rate limiting, congestion avoidance, congestion management, packet filtering, redirection, traffic statistics, and ACL-based simplified traffic policy.
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Licensing Requirements and Limitations for Re-marking

Licensing Requirements and Limitations for Re-marking

Involved Network Elements

Other network elements are not required.

Licensing Requirements

Re-marking is a basic feature of a switch and is not under license control.

Version Requirements

Table 9-1 Products and minimum version supporting re-marking

Product

Minimum Version Required

CE12804/CE12808/CE12812

V100R001C00

CE12816

V100R003C00

CE12804S/CE12808S

V100R005C00

CE12800E

V200R002C50

Feature Limitations

  • For CE12800, the traffic policy containing remark cannot be used in the outbound direction.
  • For CE12800, remark dscp and remark 8021p cannot be configured in a traffic policy simultaneously.

    For CE12800E switches, remark dscp and remark 8021p could be configured in a traffic policy and take effect simultaneously.

  • The remark 8021p and remark dscp commands can only change 802.1p and DSCP priorities of packets but not queues where packets are scheduled. To change the queues where packets are scheduled, run the remark local-precedence command.
  • For CE12800E switches, in a stack system, When QinQ encapsulation type is configured on a Layer 2 sub-interface used as a service access point, re-marking of DSCP priorities of IP packets does not take effect during inter-card packet forwarding. DSCP priorities of IP packets do not change, and become 0 after the packets enter a VXLAN tunnel. To solve the problem of DSCP priorities becoming 0 after the packets enter the VXLAN tunnel, run the qos phb marking dscp enable command to enable mapping between PHBs and DSCP priorities in the outbound direction.

  • For CE12800E switches configured with ED-E, EG-E, and EGA-E series cards, when the traffic policy including remark dscp and remark 8021p is applied inbound, you are advised to configure remark local-precedence in the traffic policy applied inbound simultaneously or run the command qos phb marking 8021p disable and undo qos phb marking dscp enable to disable mapping from PHBs to 802.1p priorities for outgoing packet.

  • In earlier versions of V200R002C50, if the traffic policy containing remark 8021p is applied to an interface in the inbound direction and untagged packets match the traffic policy, the field about the protocol type in the packets will be modified incorrect because the packets do not carry the VLAN tag field. As a result, packets are discarded incorrectly. In V200R002C50 and later versions, if the traffic policy containing remark 8021p is applied to an interface in the inbound direction, the traffic policy cannot match untagged packets.

    If 802.1p priorities of untagged packets need to be re-marked, change remark 8021p in the traffic policy to remark local-precedence and run the undo qos phb marking 8021p disable command in the system view to enable the mapping from PHBs to 802.1p priorities for outgoing packets. Otherwise, re-marking the packet will not take effect.

  • For the CE12800, if the traffic policy containing remark dscp is applied to an interface in the inbound direction, bits 6 and 7 in the ToS field of IPv6 packets are mapped to 0. The device does not support ECN for packets.

  • On 48GE cards, double-tagged packets containing Layer 3 or Layer 4 fields in the outbound direction cannot be re-remarked.
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Updated: 2019-05-05

Document ID: EDOC1100004202

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