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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 13

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Common Configuration Errors

Common Configuration Errors

This section describes common priority mapping configuration errors.

Packets Enter Incorrect Queues

Common Cause

This fault is commonly caused by one of the following:
  • The priority mapping configured in the DiffServ domain trusted by the inbound interface does not meet requirements.
  • There are configurations affecting the queues that packets enter on the inbound interface.
  • There are configurations affecting the queues that packets enter in the VLAN that packets belong to.
  • There are configurations affecting the queues that packets enter in the system.

On the CX31x&CX91x series switch module 10GE switching planes and CX710 switch module 40GE converged switching plane, only queues 0, 1, 2, and 6 are available for unknown unicast packets, and queues 0 to 7 are available for known unicast packets. For details, see Default Configuration.

Procedure

  1. Check whether priority mappings are correct.

    Run the display this command in the inbound interface view and check the configuration of the trust upstream command. If the trust upstream command is not used, the system trusts the DiffServ domain default. Then, run the display diffserv domain ds-domain-name command to check whether the priority mapping configured in the DiffServ domain trusted by the inbound interface is correct.

    • If not, run the ip-dscp-inbound or 8021p-inbound command to correctly configure priority mapping.
    • If so, go to step 2.

  2. Check whether there are configurations affecting the queues that packets enter on the inbound interface.

    The following configurations affect the queues that packets enter on the inbound interface:
    • If the traffic-policy has the traffic behavior of remark local-precedence, the system sends packets to queues based on the re-marked PHB.
    • If the trust upstream none command is executed, priorities of all the incoming packets are not mapped and the packets enter queues based on the interface priority.
    • If the port link-type dot1q-tunnel command is used but the trust 8021p inner command is not used on the interface, all the incoming packets enter queues based on the interface priority.

    Run the display this command in the inbound interface view to check whether there are configurations affecting packets enqueuing on the inbound interface.

    • If so, delete or modify the configuration as required.
    • If not, go to step 3.

  3. Check whether there are configurations affecting the queues that packets enter in the VLAN that packets belong to.

    The following configurations affect the queues that packets enter in the VLAN that packets belong to:

    • If the traffic-policy has the traffic behavior of remark local-precedence, the system sends packets to queues based on the re-marked PHBs.
    • If the traffic-policy has the traffic behavior of remark 8021p, the system maps the re-marked priorities of packets to PHBs and sends the packets to queues based on the mapped PHBs.
    Run the display this command in the view of the VLAN that packets belong to and check whether the configurations affecting the packets enqueuing are performed in the VLAN.
    • If so, delete or modify the configuration as required.
    • If not, go to step 4.

  4. Check whether there are configurations affecting the queues that packets enter in the system.

    The following configurations affect the queues that packets enter in the system:

    • If the qos local-precedence-queue-map command is executed, the system sends packets to queues based on the mapping between PHBs and queues specified by this command.

    • If the traffic-policy global has the traffic behavior of remark local-precedence, the system sends packets to queues based on the re-marked PHB.
    • If the traffic-policy global has the traffic behavior of remark 8021p, the system maps the re-marked priorities of packets to PHBs and sends the packets to queues based on the mapped PHBs.

    Run the display current-configuration command to check whether there are configurations affecting the queues that packets enter in the system. If so, delete or modify the configuration as required.

    A traffic policy is applied to an interface, a VLAN, and the system in descending order of priorities.

Priority Mapping Results Are Incorrect

Common Cause

This fault is commonly caused by one of the following:
  • On the outbound interface, packets do not enter queues corresponding to the priority of packets.
  • The priority types trusted by the inbound and outbound interfaces do not meet requirements.
  • The priority mappings configured in the DiffServ domain trusted by the inbound and outbound interfaces do not meet requirements.
  • There are configurations affecting priority mapping on the inbound and outbound interfaces.

Procedure

  1. Check that packets enter correct queues on the outbound interface.

    Run the display qos queue statistics interface interface-type interface-number command to check whether packets enter correct queues on the outbound interface.

  2. Check that the priority types trusted by the inbound and outbound interface are correct.

    Run the display this command in the interface view to check whether the trusted priority type set using the trust command on the interface is correct. (If the trust command is not used, the system trusts the 802.1p priority in the outer VLAN tag by default.)

    • If not, run the trust command to correctly configure the priority type trusted by the interface.
    • If so, go to step 3.

  3. Check that the priority mapping configured in the DiffServ domain trusted by the inbound and outbound interfaces is correct.

    Run the display this command in the view of the inbound and outbound interfaces to check whether the trust upstream command is used. If the trust upstream command is not used, the system trusts the DiffServ domain default by default.

    Run the display diffserv domain ds-domain-name command to check whether the mapping between PHBs/colors and packet priorities is correct.

    • If not, run the ip-dscp-outbound or 8021p-outbound command to correctly configure the mapping between PHBs/colors and packet priorities.
    • If so, go to step 4.

  4. Check whether there are configurations affecting priority mapping on the inbound and outbound interfaces.

    The following configurations affect priority mapping on the inbound and outbound interfaces:
    • If the qos phb marking disable command is executed, the system does not perform PHB mapping for outgoing packets on an interface.
    • If the trust upstream none command is executed, the system does not perform PHB mapping for outgoing packets on an interface.
    • If the traffic-policy has the traffic behavior of remark 8021p or remark dscp on the inbound and outbound interfaces, the re-marked priority is the packet priority.

    Run the display this command in the view of the inbound and outbound interfaces to check whether there are configurations affecting priority mapping. If so, delete or modify the configuration as required.

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Updated: 2019-12-13

Document ID: EDOC1000041694

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