Onfiguration For; Rspan Features - 3Com 5500-SI Configuration Manual

20

RSPAN Features

C

ONFIGURATION FOR

Remote switched port analyzer (RSPAN) refers to remote port mirroring. It breaks
through the limitation that the mirrored port and the mirroring port have to be
located in the same switch, and makes it possible that the mirrored and mirroring
ports be located across several devices in the network, and greatly enhances the way
that the network administrator can manage the switch.
The application of RSPAN is illustrated in Figure 101.
Figure 101 RSPAN application
There are three types of switches with the RSPAN enabled.
Source switch: the switch to which the monitored port belong.
■
Intermediate switch: the switches that are between the source and destination
■
switches on the network.
Destination switch: the switch to which the remote mirroring destination port
■
belong.
Table 403 gives an illustration of how various ports are involved in the mirroring
operation.
Table 403 The ports involved in the mirroring
The ports
Switch involved
Source switch Source port
Reflector port
Trunk port
Intermediate Trunk port
switch
Destination switch Trunk port
Destination port
Q S F
O
Function
The port to be mirrored. By means of local port
mirroring, the users' data packets can be copied to the
reflector port. There could be more than one source
port.
Receive users' data packets that are mirrored on a local
port.
Send the mirrored packets to the intermediate switch
or the destination switch.
Send the mirrored packets to the destination switch.
Two Trunk ports are necessary for the intermediate
switch in order to connect with devices from both the
source and destination switches.
Receive remote mirrored packets.
Monitor the remote mirrored packets
EATURES