No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


Configuration Guide - Network Management and Monitoring

S1720, S2700, S5700, and S6720 V200R011C10

This document provides the configurations of network management and monitoring features supported by the product, including SNMP, RMON and RMON2, LLDP, Performance Management, iPCA, NQA, Service Diagnosis, Mirroring, Packet Capture, NetStream, sFlow, TWAMP Light, and NETCONF.

Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
LSP Trace Test

LSP Trace Test

The NQA LSP trace test detects the forwarding paths of LDP LSPs or TE LSPs and collects statistics about each device along a forwarding path.

Figure 7-14 shows the process of an LSP trace test:

  1. The source (PE-A) constructs an MPLS Echo Request packet whose destination IP field is an IP address on the block. The source then searches for the corresponding LSP. For a TE LSP, the packet can be sent from a tunnel interface and then forwarded along a specified CR-LSP.

    The MPLS Echo Request packet should contain the downstream mapping type-length-value (TLV) that carries LSP downstream information on the current node, including next-hop IP address and outbound label. The TTL of the first MPLS Echo Request packet is 1.

  2. The MPLS Echo Request packet is forwarded through the specified LSP in the MPLS domain. When the first hop of the LSP receives the packet, its TTL decreases to 0 and it times out. The first hop then returns an MPLS Echo Reply packet.

  3. The source continues to send MPLS Echo Request packets, with the TTL increasing by 1 each time. This process is repeated until all the LSRs along the LSP have returned their responses.

  4. According to the MPLS Echo Reply packet received from each hop, the source obtains the LSP forwarding path from the source to the destination and collects statistics about each device along the forwarding path.
Figure 7-14  Network for LSP trace test

The LSP trace test results and historical records are collected in test instances. You can run commands to view the test results and historical records.

Updated: 2020-02-06

Document ID: EDOC1000178174

Views: 208710

Downloads: 827

Average rating:
This Document Applies to these Products

Related Version

Related Documents

Previous Next