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Configuration Guide - Network Management and Monitoring

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of Network Management and Monitoring, including SNMP, RMON, NETCONF, OpenFlow, LLDP, NQA, Mirroring, Packet Capture, Packet Trace, Path and Connectivity Detection Configuration, NetStream, sFlow, and iPCA.
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Hop-by-Hop Performance Measurement

Hop-by-Hop Performance Measurement

End-to-end performance measurement can only collect statistics on network ingress and egress, so the statistics reflect the network performance. When a network fault occurs, end-to-end performance measurement cannot precisely locate the failure. To precisely locate the failure, use the hop-by-hop performance measurement.

Hop-by-hop measurement and end-to-end measurement are applicable to the same scenarios (such as point-to-point and VXLAN).

In hop-by-hop network performance measurement, continual or on-demand performance measurement needs to be configured, as shown in Table 16-3.
Table 16-3 Hop-by-hop performance measurement



Hop-by-hop continual measurement

To detect network performance degradation in a timely manner, use this mode. This mode displays continual network running status.

Hop-by-hop on-demand measurement

If you detect that network performance degrades or you want to precisely locate the faulty node, use this mode. This mode displays detailed performance statistics in recent time.

Hop-by-Hop Performance Measurement

Hop-by-hop measurement is based on Atomic Closed Hop (ACH). A network is divided into multiple ACHs, and TLP is configured for each ACH. However, in end-to-end measurement, TLPs only need to be configured on two ends of the network. After the ingress TLP group and egress TLP group are configured for the specified target flow in an ACH, the packet loss and delay statistics in this ACH can be collected. In this manner, the performance statistics on the entire network can be collected.

In Figure 16-13, a target flow enters the transit network through switch 1, passes switch 2, and leaves the network through switch 3. Hop-by-hop performance measurement is configured on switch 1, switch 2, and switch 3. When a fault occurs on the transit network, you can collect packet loss and delay statistics by dividing the network into multiple segments and locate the failure points.

Figure 16-13 Hop-by-hop performance measurement

ACH Division

When MCP performs hop-by-hop measurement, service paths are created based on hops. Only the statistics in a closed hop can accurately reflect network performance. All the flows sent from the ingress of an ACH are sent to the egress of this ACH. That is, all flows reaching the egress of an ACH are from the ingress of the ACH.

ACH can be divided in two methods:
  • Based on path: If you have planned the paths for a small- or middle-sized network, you can manually select the measurement points.
  • Based on measurement cross section: For a large-sized network where the paths are undetermined, a measurement cross section is constituted of several key points, and all flows on the network traverse this cross section. The ACH is divided based on multiple measurement cross sections.

Path-based ACH division

In Figure 16-14, TLPs A, B, and D form an ACH, TLPs C and E form an ACH, TLPs D, E, and F form an ACH, and TLPs F, G, H, and I form an ACH.

Figure 16-14 Hop-by-hop performance measurement

Measurement cross section-based ACH division

On a network where paths are undetermined, as shown in Figure 16-15, there are three measurement cross sections, A, B, and C. All flows on this network traverse the three cross sections. Cross sections A and B form an ACH, and cross sections B and C form an ACH.

Figure 16-15 Hop-by-hop performance measurement
Updated: 2019-04-20

Document ID: EDOC1100075365

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