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Monitoring Hub Performance 2-19
Using the 7C0x SmartSwitch Hub View
• Load — shows a value for each active port that represents that port’s traffic as
a percentage of the theoretical maximum load: either 10 Mbps (for Ethernet),
or 100 Mbps (for Fast Ethernet).
• Packets — displays the number of good packets experienced by each interface
in one of four ways:
- Packets/second — the rate of traffic being experienced by the port
- Average Packet Size — displayed in bytes; calculated by dividing the total
number of octets by the total number of good packets
- Broadcast — the percentage of good packets on each port that are
broadcast packets
- Multicast — the percentage of good packets on each port that are
multicast packets
• Collisions — displays the total number of receive (those the device detects
while receiving a transmission) and transmit (those the device detects while
transmitting) collisions, as a percentage of the total traffic experienced by the
port.
• Errors — displays the total number of packets with a specific error type, as a
percentage of the total number of errors experienced by the port. Available
error types are:
- CRC/Alignment — the number of packets processed by a port that had a
non-integral number of bytes (alignment errors) or a bad frame check
sequence (Cyclic Redundancy Check, or CRC error), expressed as a
percentage of the total number of error packets experienced by the port.
- Fragments — the number of packets processed by a port that were
undersized (less than 64 bytes in length; a runt packet) and had either a
non-integral number of bytes (alignment error) or a bad frame check
sequence (CRC error), expressed as a percentage of the total number of
error packets experienced by the port.
- Jabbers — the number of packets processed by a port that were oversized
(greater than 1518 bytes; a giant packet) and had either a non-integral
number of bytes (alignment error) or a bad frame check sequence (CRC
error), expressed as a percentage of the total number of error packets
experienced by the port.
• Frame Sizes — displays the total number of packets processed by a port that
were of a specific size, expressed as a percentage of the total number of good
packets experienced by the port. Frame size breakdowns available are:
- Runts (packets with fewer than 64 bytes)
-64
- 65-127
- 128-255
- 256-511