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 Management
Specification. They are described below:
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| Counter Name | Definition | Valid Range | Corrective Action if over Valid |
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| Good Packets | Number of | Less than 4000 | Decrease the traffic level by |
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| packets per | using a switch to segment the |
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| second.* | network. |
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| Collisions | Number of times the port was involved | Less than 2 times | Decrease the traffic level by |
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| in a collision. A single collision will be | the number of good | using a switch to segment the |
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| counted by all ports involved, so the | packets. | network |
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| total collision counters may be less than |
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| the sum of the port counts. |
| Replace bad cables and/or |
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| transceivers if problems persist. | |
the |
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| Rarely, you may have a |
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| defective LAN adapter. | |
Managing |
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| Late Collisions | Number of collisions which went | Less than.1% of | Too many repeaters between | |
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| undetected by the sending end node. | good packets. | end nodes, or cables which are |
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| too long, or bad cable. |
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| CRC/Alignment | Number of packets transmitted | Less than.1% of | This counter indicates faulty |
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| Errors | incorrectly and number of incorrectly | good packets. | cabling. |
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| aligned packets. |
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| Giant Packets | Number of packets larger than 1518 | Less than.1% of | Update the LAN adapter drivers |
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| bytes. | good packets. | on all nodes connected to the |
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| port. |
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| Broadcast Packets | Number of packets addressed to | Less than 200 | Decrease the number of nodes |
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| everyone in the network. These packets | packets per | in an IP subnet or IPX network |
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| consume CPU resources from each | second.* | by using more routers. Consult |
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| node on the network. |
| Novell Netware documentation |
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| on how to reduce broadcasts in |
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| an IPX network. |
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| *The port counters in the ASCII console show totals, not number of packets per second. For the Good Packets and | |||
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| 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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