Avaya Troubleshooting Routers Průvodce řešením problémů stáhnout pdf (Strana 44)

Troubleshooting Routers

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308656-14.00 Rev 00

Using the ping Command

The

ping

command is available both from the Site Manager Administration menu

and the Technician Interface. When you enter the

ping

command, the router, not

Site Manager, issues an Internet Control Message Protocol (ICMP) echo request.

Options include packet size, number of repetitions, and the ability to trace the path

of the ICMP echo request.

When you lose AppleTalk, APPN, IP, IPX, OSI, or VINES connectivity, use the

ping

command to isolate the problem interface. Try pinging the end node that has

connectivity problems. If you fail to get a response, ping the local router interface,

and then ping each router interface along the way to the problem node.

If, after attempting to ping a device, the response is

Unknown Network or Network

Unreachable

, check the local node’s routing table and its default gateway

definition.

If the

ping

command yields the response Target does not respond, the station

from which you issued

ping

sent an echo request to the address it has for the end

node, but never received a reply. In this case, start pinging each node in the path

between the source and destination until you find the problem interface.

See Using Technician Interface Software or Configuring and Managing Routers

with Site Manager for detailed instructions on issuing the

ping

command.

Using the Packet Capture Tool

The Technician Interface Packet Capture tool allows you to filter, send, capture,

and view packets in hexadecimal format. You can save the data in a Network

General Sniffer format file, transfer the file to a network analyzer, and use the

analyzer to parse the data. Nortel Networks recommends that you use Packet

Capture to capture data generated at remote routers, save it in Network General

Sniffer format files, and use TFTP or FTP to transfer the files to a site where you

can open them using a network analyzer.

Appendix B provides detailed instructions on how to use Packet Capture.

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