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CLI-based Configuration Guide - Network Management and Monitoring

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Understanding LSDP

Understanding LSDP

This section describes the LSDP implementation mechanism.

LSDP Implementation

LSDP provides millisecond-level link status detection and sets interface status to Up or Down based on the link status.

As shown in Figure 8-1, LSDP is configured on RouterA to detect the connectivity of the link between RouterA and RouterB. LSDP uses two types of packets: ARP and ICMP packets. The detection process is as follows:

  1. RouterA's GE1/0/0 sends an ARP request packet to RouterB's GE1/0/0 to request for its MAC address.
    • If RouterA's GE1/0/0 receives an ARP reply packet from RouterB's GE1/0/0, LSDP proceeds to step 2.
    • If RouterA's GE1/0/0 does not receive an ARP reply packet within the maximum number of probe counts, LSDP considers this probe failed, sets the status of RouterA's GE1/0/0 to Down, and starts the next round of probe (that is, sends a new ARP request packet to RouterB's GE1/0/0).
  2. RouterA's GE1/0/0 sends an ICMP request packet to RouterD's GE1/0/0 to detect link connectivity.
    • If RouterA's GE1/0/0 receives an ICMP reply packet, LSDP sets the status of RouterA's GE1/0/0 to Up.
    • If RouterA's GE1/0/0 does not receive an ICMP reply packet within the maximum number of probe counts, LSDP considers this probe failed and sets the status of RouterD's GE1/0/0 to Down.

    LSDP starts the next round of probe.

Figure 8-1  LSDP network diagram
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Updated: 2019-05-17

Document ID: EDOC1000174072

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