Service Provider Bridging; Vlan Stacking - Dell Force10 C150 Configuration Manual

Ftos configuration guide ftos 8.4.2.7 e-series terascale, c-series, s-series (s50/s25)

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Service Provider Bridging

This chapter contains the following major sections:

VLAN Stacking on page 951

VLAN Stacking Packet Drop Precedence on page 962

Dynamic Mode CoS for VLAN Stacking on page 965

Layer 2 Protocol Tunneling on page 967

Provider Backbone Bridging on page 971

VLAN Stacking, also called Q-in-Q, is defined in IEEE 802.1ad—Provider Bridges, which is an

amendment to IEEE 802.1Q—Virtual Bridged Local Area Networks. It enables service providers to use

802.1Q architecture to offer separate VLANs to customers with no coordination between customers, and

minimal coordination between customers and the provider.

Using only 802.1Q VLAN tagging all customers would have to use unique VLAN IDs to ensure that traffic

is segregated, and customers and the service provider would have to coordinate to ensure that traffic

mapped correctly across the provider network. Even under ideal conditions, customers and the provider

would still share the 4094 available VLANs.

Instead, 802.1ad allows service providers to add their own VLAN tag to frames traversing the provider

network. The provider can then differentiate customers even if they use the same VLAN ID, and providers

can map multiple customers to a single VLAN to overcome the 4094 VLAN limitation. Forwarding

decisions in the provider network are based on the provider VLAN tag only, so the provider can map traffic

through the core independently; the customer and provider need only coordinate at the provider edge.

is supported on platforms:

is supported on E-Series ExaScale

x with FTOS 8.2.1.0. and later.

Service Provider Bridging | 951

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