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C H A P T E R 3 Standard Configuration
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Port Mirroring
Purpose Provides a facility to debug or monitor traffic on a specific port, by
duplicating the traffic and sending it to a specified port. Only one pair
of ports can be mirrored per switch. Within Port Mirroring, you can:
• Add a new entry to the list
• Delete an entry
• Edit existing entries
Important When a switch has Port Mirroring enabled, the switch cannot collect
RMON data from the RMON groups 4 to 8.
Adding Port Mirroring To add a mirrored port to a switch:
Note If Port Mirroring is enabled, the source port will be in store-
and-forward mode. Therefore, Runts, CRCs, etc. will not be
forwarded or mirrored.
1 Select Device Setup or Stack Setup.
2 Click Port Mirroring.
3 Click Add.
4 For a stack, click Switch and select one.
5 Click Reflect from and select the port that you want.
6 Click Reflect to and select the port to where the traffic can
be debugged/monitored.
7 Click OK.
500.book Page 50 Thursday, September 2, 1999 1:44 PM