Cadence Flash F200-2 Guía para resolver problemas descargar pdf (Pagina 50)

50 Troubleshooting

— Does the ELAN and TLAN Link LED flash when traffic occurs on

the respective interface?

•

Obtain a network diagram of the VGMC/Signaling Server, IP Phones,

and all other data devices on the network. Ask the customer how much

traffic is on their network. Do router statistics show dropped packets?

Try to understand which devices experience problems: all devices or a

specific subnet? Do problems occur all the time or intermittently?

•

Replacing a VGMC/Signaling Server means a new MAC address

(from the new device) is associated with the IP address of the existing

device. For some routers, you must ping the router interface from the

VGMC/Signaling Server to speed the update of the router ARP table,

during which time packets to the VGMC/Signaling Server IP address

do not arrive on the new card.

• Try connecting one or more phones and a VGMC/Signaling Server on

an isolated LAN to see if the problems persist. For example, using

a 10/100BaseT Ethernet crossover cable, connect a single IP Phone

to the VGMC/Signaling Server card TLAN interface. If the single

telephone works correctly, then a problem likely exists with the LAN. If

the problems persist, a card hardware or software problem is likely.

•

Run a ping test between the VGMC/Signaling Server or a PC on the

same TLAN subnet and one of the phones experiencing a problem.

For instance, ping from the VGMC/Signaling Server subnet to an

IP Phone once each second for 1 hour. Log the output. Were any

packets lost? Was the delay highly variable? These situations indicate

that the network may not be suitable for carrying voice traffic.

• Connect a sniffer to the LAN, close to the VGMC/Signaling Server

(preferably on a mirrored switch port or a hub) to capture packets going

to or from the card. When a problem occurs, stop the sniffer. If the

traces and other information, such as the IP address of the devices

involved, are provided to support personnel, they can be examined to

determine if a network problem exists or if a problem exists with the

VGMC/Signaling Server.

Note: Potential privacy concerns can occur with this approach

because the RTP packets can be reassembled into audio files (a

necessary step when investigating voice QoS problems); you may

want to notify users about packet monitoring.

• If, after you run the tests, there appears to be a LAN (rather than

VGMC product) problem, ask the customer if they can enable any

QoS mechanisms in their network. If the problem appears to be with

a VGMC product, escalate the issue following the normal escalation

process.

Nortel Communication Server 1000

Troubleshooting Guide for Distributors

NN43001-730 02.02 31 December 2009

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