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3-6
Managing the Hub
Console Command Reference
Managing the Hub
To enable or disable the Cisco Discovery Protocol (CDP). The command takes
either an ON or an OFF argument. The initial setting is ON. ON enables the
protocol. OFF disables it. If no option is chosen, the current status is shown.
To display network activity counters for each network port, the hub’s
SNMP agent, and the global count for all ports.
The port counters are from the IEEE 802.3 Repeater Management
Specification. They are described below:
CDpstatus
COunters
Counter Name Definition Valid Range
Corrective Action if over Valid
Range
Good Packets Number of error-free packets received. Less than 4000
packets per
second.*
Decrease the traffic level by
using a switch to segment the
network.
Collisions Number of times the port was involved
in a collision. A single collision will be
counted by all ports involved, so the
total collision counters may be less than
the sum of the port counts.
Less than 2 times
the number of good
packets.
Decrease the traffic level by
using a switch to segment the
network
Replace bad cables and/or
transceivers if problems persist.
Rarely, you may have a
defective LAN adapter.
Late Collisions Number of collisions which went
undetected by the sending end node.
Less than.1% of
good packets.
Too many repeaters between
end nodes, or cables which are
too long, or bad cable.
CRC/Alignment
Errors
Number of packets transmitted
incorrectly and number of incorrectly
aligned packets.
Less than.1% of
good packets.
This counter indicates faulty
cabling.
Giant Packets Number of packets larger than 1518
bytes.
Less than.1% of
good packets.
Update the LAN adapter drivers
on all nodes connected to the
port.
Broadcast Packets Number of packets addressed to
everyone in the network. These packets
consume CPU resources from each
node on the network.
Less than 200
packets per
second.*
Decrease the number of nodes
in an IP subnet or IPX network
by using more routers. Consult
Novell Netware documentation
on how to reduce broadcasts in
an IPX network.
*The port counters in the ASCII console show totals, not number of packets per second. For the Good Packets and
Broadcast packets, display counters twice over a period of one section to see if the value falls in the valid range.
MUCHO.BK : ch3.fm5 Page 6 Thursday, June 26, 1997 11:37 AM