Allied Telesis AlliedWare Plus 5.2.1 Datenblatt - Seite 3

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Bridge Protocol Data Unit (BPDU) Protection

BPDU Protection adds extra security to the

Spanning Tree Protocol (STP). It protects the

spanning tree configuration by preventing

malicious DoS attacks caused by spoofed BPDUs.

BPDU Protection is designed to be enabled on

ports that should not receive BPDUs.These are

edge ports connected to end user devices that do

not run spanning tree. If a spoofed BPDU packet

is received on a protected port, the BPDU

Protection feature disables the port and alerts the

network manager.

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VLAN Double Tagging

VLAN double tagging allows network service

providers to use a single VLAN to support

customers with multiple VLANs. In this way, they

can simply and cost-effectively offer IP-based

solutions in scalable implementations.

Service providers often have customers whose

VLAN range requirements overlap, and the traffic

from different customers is mixed in with the

service providers' infrastructure. With VLAN

double tagging, each customer is given a

customer-ID (CID), which is a unique identifier

within the service provider infrastructure.Traffic

from individual customers is tagged with the CID

and segregated from other customer's traffic.The

VLANs identification of the customer's network

can be preserved while the traffic is tunnelled

through the network service provider's

infrastructure.