SNR S2989G-48TX-RPS — руководство по отладке и диагностике сетевых технологий [477/553]

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S2989G-24TX Operation Manual

Chapter 8 Debugging and Diagnosis Configuration

8-30

Switch(Config-If-Ethernet1/0/10)#exit

8.7.4

RSPAN Troubleshooting

Due to the following reasons, RSPAN may not function:

 Whether the destination mirror port is a member of the Port-channel group. If so,

please change the Port-channel group configuration;

 The throughput the destination port is less than the total throughput of the source

mirror ports. If so, the destination cannot catch all the datagrams from every source

ports. To solve the problem, please reduce the number of the source ports, or mirror

only single direction data flow, or choose some other port with higher capacity as the

destination port.

 Between the source switch and the intermediate switch, whether the native VLAN of

the TRUNK ports is configured as RSPAN VLAN. If so, please change the native

VLAN for the TRUNK ports.

 After configured RSPAN, the vlan tag will be added on the packet of the egress mirror.

It will cause the abort error frame on the reflection port, so the default MTU value of

the switch should be modified.

8.8

sFlow

8.8.1

Introduction to sFlow

The sFlow (RFC 3176) is a protocol based on standard network export and used on

monitoring the network traffic information developed by the InMon Company. The

monitored switch or router sends date to the client analyzer through its main operations

such as sampling and statistic, then the analyzer will analyze according to the user

requirements so to monitor the network.

A sFlow monitor system includes: sFlow proxy, central data collector and sFlow

analyzer. The sFlow proxy collects data from the switch using sampling technology. The

sFlow collector is for formatting the sample data statistic which is to be forwarded to the

sFlow analyzer which will analyze the sample data and perform corresponding measure

according to the result. Our switch here acts as the proxy and central data collector in the

sFlow system.

We have achieved data sampling and statistic targeting physical port.

Our data sample includes the IPv4 and IPv6 packets. Extensions of other types are

not supported so far. As for non IPv4 and IPv6 packet, the unify HEADER mode will be