Configuring a PWE3 Trace Test Instance on a Multi-Hop PW

Procedure

1. Run system-view

   The system view is displayed.

2. Run nqa test-instance admin-name test-name

   An NQA test instance is created and the test instance view is displayed.

3. Run test-type pwe3trace

   The test type is set to PWE3 Trace.

4. (Optional) Run vc-type ldp

   The method of setting up a PW is configured.

5. (Optional) Run local-pw-type local-pw-type

   The type of the local PW is configured. By default, the type is Ethernet.

6. Run lsp-version { rfc4379 | draft6 }

   A protocol is configured for the LSP test instance.

7. (Optional) Run label-type { control-word | { label-alert | normal } [ no-control-word ] }
   The type of the PW label is configured.

   

   • When label-type is set to control-word, run the remote-pw-id remote-pw-id command to configure the ID of the remote end of the PW. If the PW label type is set to control-word, the control word feature must be enabled for the PW.

   • When label-type is set to label-alert, run the destination-address ipv4 ipv4-address [ lsp-masklen masklen | lsp-masklen masklen lsp-loopback loopback-address | lsp-loopback loopback-address lsp-masklen masklen ] command to configure the destination IP address of the PWE3 trace test.

   • When label-type is set to normal, run the destination-address ipv4 ipv4-address [ lsp-masklen masklen | lsp-masklen masklen lsp-loopback loopback-address | lsp-loopback loopback-address lsp-masklen masklen ] command to configure the destination IP address of the PWE3 trace test.

8. Run local-pw-id local-pw-id

   The ID of the local end of the PW is configured.

9. (Optional) Run peer-address peer-address

   A peer IP address is configured.

   

   For an NQA PWE3 ping or trace test instance, if the primary and secondary VCs are configured with the same VC ID, the peer-address command must be configured to specify a peer IP address. This configuration determines a unique PW for the NQA test.

10. (Optional) Run ttl-copymode { pipe | uniform }

    A time to live (TTL) copy mode is set.

    The processing method for TTL values varies according to copy mode.

    • If you set the copy mode to pipe, the system removes the outer label, decreases the TTL value in the inner label by 1, and sets the TTL value in the outer label to 255 after receiving a packet.
    • If you set the copy mode to uniform, the system copies the TTL value in the outer label to the inner label, decreases the TTL value in the inner label by 1, and sets the TTL value in the outer label to the TTL value in the inner label after receiving a packet.

11. (Optional) Run the following commands to configure other parameters for the PWE3 trace test:

    • To configure the response mode of the Echo packet, run the lsp-replymode { no-reply | udp } command.

    • To configure the LSP EXP value, run the lsp-exp exp command.

    • To configure maximum hops of the PWE3 trace test, run the tracert-hopfailtimes times command.

    • To configure the initial TTL value and maximum TTL value of the packet, run the tracert-livetime first-ttl first-ttl max-ttl max-ttl command.