Cambium Networks cnMatrix EX2010-P Handleiding (320 Pagina's)

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L2 Features 162

In this use case, Customers 1 and 2 have set up overlapping sets of VLAN IDs in their networks, and by

using Q-in-Q, the network administrator of the provider network can keep the packets originating from

Customer 1 away from the interfaces of Customer 2 and vice-versa.

The provider network is comprised by one or several provider edge switches – where the customers

connect to the provider cloud, and one or several core switches, that can be qinq-unaware with the single

purpose of bridging traffic from VLANs 1000 and 2000 (the S-VLANs).

The provider-edge bridge mode is a global mode in which the switch ports can be either customer-edge

ports or provider ports. Their role is configurable by the user, depending on if they connect to a customer

or the network provider core.

C-VLAN (Customer-VLAN) – the VLAN id assigned by the customer network. In case the packet is

untagged, the C-VLAN can be assigned by the provider bridge at ingress. Original C-VLANs are kept as

part of the packet payload.

S-VLAN (Service-VLAN) – the VLAN id assigned upon ingress on a customer-edge port. This is the VLAN

id used in the bridging process.

S-VLAN tag – an additional VLAN tag added to the customer packet, containing the VLAN id, the 802.1ad

ethernet type, and the S-TAG dot1p user priority. This tag is added when the packets egress via a

provider port and stripped when the packets egress via a customer-edge port.

Double-tagged packet – A packet that has both the S-TAG and the C-TAG. These packets are forwarded

via the provider ports. The S-TAG is referred to as the external tag, while the C-TAG is the internal tag,

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