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Протокол snap блокировка трафика

Доброго времени суток всем Наговцам!

 

На одном из интерфейсов приходит вот такой трафик

21:42:34.909812 dc:7b:94:08:bb:16 (oui Unknown) > 01:00:0c:cc:cc:cd (oui Unknown), 802.3, length 64: LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa) Command, ctrl 0x03: oui Cisco (0x00000c), pid Unknown (0x010b): Unnumbered, ui, Flags [Command], length 50
21:42:36.917328 dc:7b:94:08:bb:16 (oui Unknown) > 01:00:0c:cc:cc:cd (oui Unknown), 802.3, length 64: LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa) Command, ctrl 0x03: oui Cisco (0x00000c), pid Unknown (0x010b): Unnumbered, ui, Flags [Command], length 50
21:42:38.920532 dc:7b:94:08:bb:16 (oui Unknown) > 01:00:0c:cc:cc:cd (oui Unknown), 802.3, length 64: LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa) Command, ctrl 0x03: oui Cisco (0x00000c), pid Unknown (0x010b): Unnumbered, ui, Flags [Command], length 50
21:42:40.923270 dc:7b:94:08:bb:16 (oui Unknown) > 01:00:0c:cc:cc:cd (oui Unknown), 802.3, length 64: LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa) Command, ctrl 0x03: oui Cisco (0x00000c), pid Unknown (0x010b): Unnumbered, ui, Flags [Command], length 50
21:42:42.926246 dc:7b:94:08:bb:16 (oui Unknown) > 01:00:0c:cc:cc:cd (oui Unknown), 802.3, length 64: LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa) Command, ctrl 0x03: oui Cisco (0x00000c), pid Unknown (0x010b): Unnumbered, ui, Flags [Command], length 50
21:42:44.929815 dc:7b:94:08:bb:16 (oui Unknown) > 01:00:0c:cc:cc:cd (oui Unknown), 802.3, length 64: LLC, dsap SNAP (0xaa) Individual, ssap SNAP (0xaa) Command, ctrl 0x03: oui Cisco (0x00000c), pid Unknown (0x010b): Unnumbered, ui, Flags [Command], length 50

Встал вопрос, можно ли во FreeBSD запретить весь трафик по протоколу SNAP ?

Можно ли его заблокировать на Cisco 29xx ?

Где может использоваться этот протокол в современных реалиях?

 

P.S. заранее спасибо за помощь.

 

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Сделайте tcpdump с ключами -v -vv , будет видно что это такое в самом деле.

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