Digital Networks North America DNswitch 800 Manuale Utente

50  Configuring and Monitoring the Switch

DNswitch 800

RMON Statistics display key statistics for each port from RMON group 1. 

(RMON groups 2, 3 and 9 can only be accessed using SNMP 
management software.) The following screen displays overall statistics on 

traffic passing through each port. RMON statistics provide access to a 

broad range of statistics, including a total count of different frame types 
passing through each port. Values displayed have been accumulated 
since the last system reboot.

Drop Events

The total number of events in which packets were dropped due 
to lack of resources.

Received Bytes 

Total number of bytes of data received on the network. This 
statistic can be used as a reasonable indication of Ethernet 
utilization.

Received Frames

The total number of frames (bad, broadcast and multicast) 
received.

Broadcast Frames 

The total number of good frames received that were directed to 
the broadcast address. Note that this does not include multicast 
packets.

Multicast Frames 

The total number of good frames received that were directed to 
this multicast address.

CRC/Alignment 
Errors

The number of frames received with CRC/alignment errors 
(FCS or alignment errors).

Undersize Frames 

The total number of frames received that were less than 64 
octets long (excluding framing bits, but including FCS octets) 
and were otherwise well formed.

Oversize Frames 

The total number of frames received that were longer than 1518 
octets (excluding framing bits, but including FCS octets) and 
were otherwise well formed. 

Fragments 

The total number of frames received that were less than 64 
octets in length (excluding framing bits, but including FCS 
octets) and had either an FCS or alignment error.

Jabbers

The total number of frames received that were longer than 1518 
octets (excluding framing bits, but including FCS octets), and 
had either an FCS or alignment error.