Link Failures

From BGNV Wiki

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.

[edit] 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.

[edit] 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.

[edit] Tools

Network Analyzer, Traceroute, VQmon