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Configuration Guide - VXLAN

CloudEngine 12800 and 12800E V200R003C00

This document describes the configurations of VXLAN.
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VXLAN QoS

VXLAN QoS

VXLAN quality of service (QoS) provides differentiated service in VXLAN applications. A device implements mapping between QoS priorities in original packets, internal priorities (local precedence assigned by the device to differentiate service classes of packets), and priorities of encapsulated packets. In this way, packets are processed differently based on internal priorities.

Figure 5-31 VXLAN QoS networking

On the network shown in Figure 5-31, VXLAN QoS implements mapping between QoS priorities in original packets, internal priorities, and priorities of encapsulated packets according to the following process:

  1. After an original packet arrives at a Layer 2 sub-interface on the switch, the switch maps the 802.1p or DSCP priority of the original packet to the internal priority (PHB and color) based on the DiffServ domain applied to the Layer 2 sub-interface, and then sends the packet to a specified queue.

  2. After a packet enters a tunnel, VXLAN encapsulation is performed for the packet. For the CE12800, the outer 802.1p priority and DSCP priority of the encapsulated packet are the same as those of the original packet. For the CE12800E, the outer 802.1p priority and DSCP priority of the encapsulated packet are mapped from the internal priority of the original packet based on the DiffServ domain.

    NOTE:

    The CE12800E performs the mapping based on the user-defined DiffServ domain.

  3. When the packet leaves the tunnel, its 802.1p priority or DSCP priority (depending on which priority is trusted on the tunnel interface) is mapped to the internal priority based on the defaultDiffServ domain. The packet then enters the queue matching the internal priority. An Ethernet interface working in Layer 3 mode only trusts the DSCP priority.

  4. The internal priority is mapped based on the DiffServ domain applied to the Layer 2 sub-interface or physical outbound interface. The packet is then transmitted based on the mapped priority.

After a DiffServ domain is applied to a Layer 2 sub-interface, the following tables define the packet mapping rules.
Table 5-2 Mapping on the CE12800E after a DiffServ domain is applied to a Layer 2 sub-interface
Encapsulation Mode on a Layer 2 Sub-interface Mapping
default
  • Inbound direction: If packets are untagged, the switch performs mapping based on the priority configured by the port priority priority-value command on the main interface and the DiffServ domain configured on the Layer 2 sub-interface. If packets are tagged, the switch performs mapping based on the 802.1p priority of packets and the DiffServ domain configured on the main interface.
  • Outbound direction: The switch performs mapping based on the DiffServ domain configured on the outbound physical interface.
untag
  • Inbound direction: The switch performs mapping based on the priority configured by the port priority priority-value command on the main interface and the DiffServ domain configured on the Layer 2 sub-interface.
  • Outbound direction: The switch performs mapping based on the DiffServ domain configured on the outbound physical interface.
dot1q
  • Inbound direction: If the main interface is configured with trust 8021p { inner | outer }, the switch performs mapping based on the 802.1p priority of packets and DiffServ domain configured on the Layer 2 sub-interface. If the main interface is configured with trust dscp, the switch performs mapping based on the DSCP priority of packets and DiffServ domain configured on the Layer 2 sub-interface.
  • Outbound direction: The switch performs mapping based on the DiffServ domain configured on the outbound physical interface.
qinq
  • Inbound direction: If the main interface is configured with trust 8021p { inner | outer }, the switch performs mapping based on the 802.1p priority of packets and DiffServ domain configured on the main interface. If the main interface is configured with trust dscp, the switch performs mapping based on the DSCP priority of packets and DiffServ domain configured on the main interface.
  • Outbound direction: The switch performs mapping based on the DiffServ domain configured on the outbound physical interface.
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Updated: 2019-05-05

Document ID: EDOC1100004207

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