Pbb Using G.8031 Protected Ethernet-Tunnels; Solution Overview - Alcatel-Lucent 7750 SR Manual

PBB Features

PBB Using G.8031 Protected Ethernet-Tunnels

IEEE 802.1ah Provider Backbone Bridging (PBB) specification employs provider MSTP
(PMSTP) to ensure loop avoidance in a resilient native Ethernet core. The usage of P-MSTP
means failover times depend largely on the size and the connectivity model used in the network.
The use of MPLS tunnels provides a way to scale the core while offering fast failover times using
MPLS FRR. There are still service provider environments where Ethernet services are deployed
using native Ethernet backbones. A solution based on native Ethernet backbone is required to
achieve the same fast failover times as in the MPLS FRR case.
The Alcatel-Lucent PBB implementation offers the capability to use core Ethernet tunnels
compliant with ITU-T G.8031 specification to achieve 50 ms resiliency for backbone failures. This
is required to comply with the stringent SLAs provided by service providers in the current
competitive environment. The implementation also allows a LAG-emulating Ethernet Tunnel
providing a complimentary native Ethernet ELAN capability. The LAG-emulating Ethernet
tunnels and G.8031 protected Ethernet tunnels operate independently.
The next section describes an applicability example where an Ethernet service provider using
native PBB offers a carrier of carrier backhaul service for mobile operators.

Solution Overview

A simplified topology example for a PBB network offering a carrier of carrier service for wireless
service providers is depicted in
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Figure 108.
7750 SR OS Services Guide