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Configuration Guide - Network Management and Monitoring

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of Network Management and Monitoring, including SNMP, RMON, LLDP, NQA, Service Diagnosis, Mirroring, Packet Capture, sFlow, and NETCONF.
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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).
Overview of Connectivity Detection

Overview of Connectivity Detection

Connectivity detection is to check whether the route from source to destination is reachable. To provide connectivity detection, the switch must work with a controller, such as Agile Controller (AC). When a switch works with an AC, OpenFlow and NETCONF connections must be set up between the switch and AC. The AC delivers connectivity detection configuration and detection packets to the switch through the NETCONF and OpenFlow connections respectively. The AC delivers three types of connectivity detection packets:
  • ICMPv4 Echo Request

    Used for IP ping in connectivity detection on the AC. It detects connectivity between two devices on Layer 2, Layer 3 or Layer 2 and Layer 3 mixed network.

  • ICMPv6 Echo Request

    Used for IPv6 ping in connectivity detection on the AC. It detects connectivity between two VMs only on an IPv6 over IPv4 VXLAN network.

  • ARP Request

    Used for MAC ping in connectivity detection on the AC. It detects connectivity between two devices only on a Layer 2 network.

NOTE:

Only the CE12800E support connectivity detection through ICMPv6 Echo Request packets.

The process of connectivity detection using ICMPv6 Echo Request packets and ARP Request packets is similar to that using ICMPv4 Echo Request packets. In the following procedure, the detection packets are ICMPv4 Echo Request packets:

In Figure 12-7, the AC and Leaf1 set up OpenFlow and NETCONF connections, and VM1 and VM2 are on the different subnet. The O&M personnel want to check route reachability between VM1 and VM2. The procedure is as follows:
  1. The AC creates an ICMPv4 Echo Request packet based on configuration. The source IP address is the IP address of VM1, and the destination IP address is the IP address of VM2.
  2. The AC delivers connectivity detection configuration to Leaf1 through the NETCONF connection to enable connectivity detection on Leaf1. The source and destination IP addresses are set as detection flags.
  3. The AC sends a Packet-out message carrying the ICMPv4 Echo Request packet to Leaf1.
  4. Leaf1, Spine1, Spine2, and Leaf2 send the ICMPv4 Echo Request packet to the next hop, and then VM2.
  5. VM2 returns an ICMPv4 Echo Reply packet to VM1.
  6. Leaf2, Spine2, and Spine1 send the ICMPv4 Echo Reply packet to the next hops.
  7. When Leaf1 receives the ICMPv4 Echo Reply packet, if the destination and source IP addresses of the ICMPv4 Echo Reply is the IP addresses of VM1 and VM2 respectively, the ICMPv4 Echo Reply packet is carried in a Packet-in message and sent to the AC, and an ICMPv4 Echo Reply packet is sent to VM1.
  8. If the AC detects a Packet-in message carrying an ICMPv4 Echo Reply packet (source is VM2 and destination is VM1) within the detection timeout interval, the route between VM1 and VM2 is reachable. If the AC does not receive such a packet within the detection timeout interval, the route between VM1 and VM2 is unreachable.
Figure 12-7 Connectivity detection diagram
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Updated: 2019-04-20

Document ID: EDOC1100075344

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