Digital Equipment DLE49-MA, Руководство пользователя

Страница: 41 / 216

Overview
DLE49-MA User’s Guide 1-5
1.1.6 Remote Monitoring (RMON)
The DLE49-MA supports all nine Ethernet RMON groups, which include
Statistics, Alarms, Events and History. These groups are enabled on all
ports by default.
The Cabletron Systems’ RMON Actions is a vendor-specific extension of
RMON and provides the ability to set an “Action” on any SNMP MIB
variable. The Action can be triggered by any RMON Event and/or Alarm.
An example of an Action would be to turn off a MIB-2 interface if a
broadcast threshold is crossed.
1.1.7 Broadcast Suppression
Broadcast Suppression enables a user to set a desired limit of receive
broadcast frames per port/per second to be forwarded out the other ports
on the module up to the set limit. Any broadcast frames above this
specified limit are dropped. In the event that broadcast frames are being
suppressed, multicast and unicast frames continue to be switched.
1.1.8 Port/VLAN Redirect Functions
The port redirect function, also referred to as “Port Mirroring,” is a
troubleshooting tool used to map traffic from a single source port to a
single destination port within the device. This feature allows frames,
including those with errors to be copied and sent to an analyzer or RMON
probe. The analyzer or RMON probe will see the data as if it were directly
connected to the LAN segment of the source port.
The VLAN redirect function is similar to the port redirect function except
that the frames received by the device are redirected to a designated
destination port according to the VLAN classification of the frames
received. The VLAN redirect function is only supported when the device
is operating as an 802.1Q switch.
1.1.9 802.1p Port Priority
The IEEE 802.1p standard is used to assign a default priority to the
frames received without priority information in their tag header, and to
map prioritized frames to the appropriate transmit queues.