Managing the Hub

Console Command Reference

CDpstatus

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.

COunters

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 ManagementSpecification. They are described below:

 

 

Counter Name

Definition

Valid Range

Corrective Action if over Valid

 

 

Range

 

 

Good Packets

Number of error-free packets received.

Less than 4000

Decrease the traffic level by

 

 

 

 

packets per

using a switch to segment the

 

 

 

 

second.*

network.

 

 

 

 

 

 

 

 

Collisions

Number of times the port was involved

Less than 2 times

Decrease the traffic level by

 

 

 

in a collision. A single collision will be

the number of good

using a switch to segment the

 

 

 

counted by all ports involved, so the

packets.

network

 

 

 

total collision counters may be less than

 

 

Hub

 

 

the sum of the port counts.

 

Replace bad cables and/or

 

 

 

 

transceivers if problems persist.

the

 

 

 

 

Rarely, you may have a

 

 

 

 

defective LAN adapter.

Managing

 

 

 

 

 

 

 

 

 

 

Late Collisions

Number of collisions which went

Less than.1% of

Too many repeaters between

 

 

 

 

 

undetected by the sending end node.

good packets.

end nodes, or cables which are

 

 

 

 

 

too long, or bad cable.

 

 

 

 

 

 

 

 

CRC/Alignment

Number of packets transmitted

Less than.1% of

This counter indicates faulty

 

 

Errors

incorrectly and number of incorrectly

good packets.

cabling.

 

 

 

aligned packets.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Giant Packets

Number of packets larger than 1518

Less than.1% of

Update the LAN adapter drivers

 

 

 

bytes.

good packets.

on all nodes connected to the

 

 

 

 

 

port.

 

 

 

 

 

 

 

 

Broadcast Packets

Number of packets addressed to

Less than 200

Decrease the number of nodes

 

 

 

everyone in the network. These packets

packets per

in an IP subnet or IPX network

 

 

 

consume CPU resources from each

second.*

by using more routers. Consult

 

 

 

node on the network.

 

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.

 

 

 

 

 

 

 

 

 

 

 

 

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