9032785 Product Overview 9
•Event: a function that operates with the Alarm group to defin e an
action that will be taken when an alarm condition occurs. The event
may write a log entry and/or send a trap message.
RMON Statistics group information is displayed on the Port S tatistics
Screen in the console menus. Additional RMON functionality is available
via SNMP.
Port Mirroring
The ELS100-24TXM switch includes the ability to mirror the traffic being
switched on any port for purposes of network traffic analysis and
connection integrity. When this feature is enabled, a protocol analyzer or
RMON probe is connected to any port in a group of eight. This por t is
configured to mirror the traffic from any other port in the same group of
ports. The groupings are ports 1-8, 9-16 and 17-24. You can only mirror
one port to another port at one time. Port mirroring occurs at the same
speed configured for the port (10Mbps-to-10Mbps or 100Mb ps-to-
100Mbps). Port mirroring is configurable in the Switch Configuration
Menu using the console menus or via SNMP.
Auto-negotiation
Auto-negotiation is a process that permits the switch to automatically
select the operational modes of its 10/100 RJ-45 ports. Upon first being
connected, the switch detects the speed of the network the port is
connected to, either 10Mbps or 100Mbps, and the type of communication
setting, half or full duplex. The port is then automatically set by the switch
to operate in the proper mode, without user intervention. It is not required
that the network device being connected to the switch supports auto-
negotiation as the ELS100-24TXM switch automatically adjusts to the
network device’s communication settings. Auto-negotiation is
configurable in the Port Configuration Menu of the console menus or via
SNMP.
Broadcast Throttling
The ELS100-24TXM has the capability to throttle (or limit) the flooding of
packets through the switch. Broadcast, multicast, and unknown
destination address unicast packets received by the switch are typically
flooded to all ports on the switch or on a given VLAN. When the number
of these types of packets being forwarded is large, the performance of th e
switch in forwarding packets of other types may suffer. A programmable
broadcast cutoff rate parameter allows a rate threshold to be set in the
switch for the forwarding of broadcast and unknown destination address
packets. If the cutoff rate is exceeded, further packets of these types ar e
dropped. This capability helps to alleviate broadcast storms, a problem
often encountered in Ethernet networks. Broadcast throttling is
configurable in the Switch Configuration menu of the console menus or
via SNMP.