Brocade Multi-Service IronWare Switching Configuration Gui Manual de usuario descargar pdf (Pagina 280)

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Overview

As with PB, PBB networks use a Spanning Tree Protocol (STP), e.g., RSTP or MSTP, to dynamically

determine the active topology of the PBB network and MAC address learning to dynamically build a

forwarding database. Since an IB-BEB forwards frames to PB and PBB networks, it has to learn

customer and backbone MAC addresses. However, since an IB-BEB is at the edge of the Service

Provider network, it only learns customer MAC addresses of the local traffic.

NOTE

When using ESI VLANs in the configuration, always configure the protocol in default VLAN.

IEEE 802.1ah Provider Backbone Bridging (PBB)

This section provides details on IEEE 802.1ah Provider Backbone Bridging (PBB), with a description

and a configuration example of an integrated PB and PBB network.

FIGURE 31 Integrated IEEE 802.1ad and IEEE 802.1ah network architecture

The Provider Backbone Bridge (PBB) protocol typically resides at the core of a carrier network,

interconnecting PB networks. Inside of a PBB network a carrier usually deploys PB systems for layer

2 interconnectivity. The PBB protocol is designed to insulate carrier infrastructure from having to

learn customer MAC addresses and provide a separation of service and networking components of

an Ethernet service provided to the customers:

• It provides IEEE 802.1ah encapsulation to add a backbone MAC header on the incoming PB

packet (which has customer DA or SA) so core carrier switches don't need to learn customer

MAC addresses.

• It supports creation of EVC (Ethernet Virtual Circuits) with a concept of an Ethernet Service

Instance (ESI), which is enabled by use of a globally unique 24-bit I-component Service

Identifier (ISID).

• PB packets are encapsulated with ISID, BVLAN, B-SA, and B-DA as shown in Figure 31.

• Layer 2 switches in the IEEE 802.1ah-encapsulated network are normal PB systems, which

process BVLAN header as if it was an SVLAN-encapsulated packet.

• Tag-types: BVLAN and SVLAN tag-types are same (default 0x88a8), so the PB systems inside a

PBB network can process BVLAN packets as if they were SVLAN encapsulated.

802.1ad

802.1ah

PBB

CVLAN

SVLAN

CVLAN

SVLAN

SVLAN ISID

BVLAN B-SA B-DA

CPE

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