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Problem: Link Failures

A link failure typically appears as a period of consecutive packet loss that can last for many seconds, followed by a change in delay after the link is re-established.

Link failures can be caused by equipment problems (e.g. a failed “blade” in a switch or router, power failure…), a cable being unplugged or cut, a configuration change in the transport network or potentially a denial of service attack. Routers are generally intelligent enough to recognize a link failure and find an alternate route.

Impact

Link failure will result in significant gaps in received speech. It is unlikely that link failures will occur frequently however they could potentially last for several seconds.

Resolution

Regular occurrence could be symptomatic of equipment or power supply reliability problems. Use traceroute to determine the point at which link failures are occurring.

Tools:

Network Analyzer, Traceroute, VQmon

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