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Loopback-detection на коммутаторах серии QSW-3300, QSW-3310,QSW-3750(TX/F), QSW-8200(RQ)
Loopback detection control
Петля или кольцо (loopback) в локальной сети - это ситуация, при которой отправленные коммутатором фреймы возвращаются на коммутатор. На канальном уровне, фреймы отправляются в соответствии с мак-адресом получателя. Коммутаторы "запоминают" мак-адреса источников занося в таблицу мак-адресов, закрепляя их за соответствующим портом, с которого поступил кадр. Таким образом следующий кадр с данным мак-адресом получателя будет сразу отправлен на соответствующий порт. Когда пакет с мак-адресом источника, уже находящимся в таблице, приходит через другой порт, запись в таблице мак-адресов изменяется. В результате, если на участке между двумя адресатами существует какая-либо петля, все мак-адреса будут закрепляться за тем портом, где существует петля (обычно мак-адреса в этом случае с высокой частотой переключаются с одного порта на другой), что вызывает перегрузку и потерю работоспособности всей сети. Избежать этого поможет функционал Loopback detection control. С его помощью, обнаружившее петлю устройство должно послать предупреждение в систему управления сетью, позволяя сетевому администратору обнаружить, локализовать и решить проблему в сети, и снизить воздействие петли на сеть.
Настройка функционала loopback-detection:
В режиме глобальной конфигурации:
(Config)#loopback-detection interval-time <1 - 300> ! Интервал между отправкой кадров loopback-detection в секундах (Config)#errdisable recovery cause loopdetect ! Активация режима автоматического включения порта после обнаружения петли (Config)#errdisable recovery interval <30-86400> ! интервал в секундах до авто-включения порта после обнаружения петли
В режиме конфигурирования интерфеса:
(Interface 1/0/х)#loopback-detection specified-vlan <vlan-list> !Указываем список vlan для loopback-detection (Interface 1/0/х)#loopback-detection ! Включаем loopback-detection
При включении данного функционала, коммутатор рассылает пакеты c мак-адресом назначения: 00:1f:ce:10:b0:03. При наличии в локальном сегменте петли отправленные пакеты вернутся на коммутатор. При получении кадра, отправленного данным коммутатором, на мак-адрес назначения: 00:1f:ce:10:b0:03 – коммутатор фиксирует обнаружение петли, отключает порт, на котором получен данный кадр и переводит его в статус err-disabled.
Диагностика loopback-detection:
В привилегированном режиме:
#show loopback-detection all ! информация о настройках loopback-detection #show errdisable recovery ! информация о настройках автовосстановления #show interface status err-disable ! информация об отключенных интерфейсах
Смотрите так же
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MAC-VLAN
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