SNR S2989G-48TX-RPS — руководство по отладке и диагностике портового зеркалирования [470/553]

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S2989G-24TX Operation Manual

Chapter 8 Debugging and Diagnosis Configuration

8-23

If problems occur on configuring port mirroring, please check the following first for

causes:

 Whether the mirror destination port is a member of a TRUNK group or not, if yes,

modify the TRUNK group.

 If the throughput of mirror destination port is smaller than the total throughput of

mirror source port(s), the destination port will not be able to duplicate all source port

traffic; please decrease the number of source ports, duplicate traffic for one direction

only or choose a port with greater throughput as the destination port. Mirror

destination port can not be pulled into Isolate vlan, or will affect mirror between

VLAN.

8.7

RSPAN

8.7.1

Introduction to RSPAN

Port mirroring refers to the duplication of data frames sent/received on a port to

another port. The duplicated port is referred to as mirror source port and the duplicating

port is referred to as mirror destination port. It is more convenience for network

administrator to monitor and manage the network and diagnostic after the mirroring

function achieved. But it only used for such instance that the mirror source port and the

mirror destination ports are located in the same switch.

RSPAN (remote switched port analyzer) refers to remote port mirroring. It eliminates

the limitation that the source port and the destination port must be located on the same

switch. This feature makes it possible for the source port and the destination port to be

located on different devices in the network, and facilitates the network administrator to

manage remote switches. It can’t forward traffic flows on remote mirror VLAN.

There are three types of switches with the RSPAN enabled:

1. Source switch: The switch to which the monitored port belongs. The source switch

copies the mirrored traffic flows to the Remote VLAN, and then through Layer 2

forwarding, the mirrored flows are sent to an intermediate switch or destination

switch.

2. Intermediate switch: Switches between the source switch and destination switch on

the network. Intermediate switch forwards mirrored flows to the next intermediate

switch or the destination switch. Circumstances can occur where no intermediate

switch is present, if a direct connection exists between the source and destination

switches.