Highly Reliable Carrier Ethernet Services
The Alcatel-Lucent 7450 ESS is the industry’s first Ethernet service switch with carrier high availability. More than ever, high availability is at the forefront of the service provider’s criteria for consumer and business Ethernet services. The demand for high availability has been most pronounced at the service provider edge where thousands of connections are hosted and availability options may be limited for WAN Ethernet services and service-aware Ethernet aggregation for consumer triple -play services.
The Alcatel-Lucent 7450 ESS architecture has been developed to meet the stringent requirements for sup- porting mission-critical applications and services, and a number of high availability features have been designed into the 7450 ESS:
•Non-Stop Routing — The Alcatel-Lucent 7450 ESS provides true stateful resiliency of the interior
gateway protocol (IGP) routing processes such that all topology information and adjacencies are main- tained even in the event of a failure of one SF/CPM. The 7450 ESS supports non-stop routing for open shortest path first (OSPF) and intermediate system- to-intermediate system (IS-IS).
•Non-Stop Services — The Alcatel-Lucent 7450 ESS also provides stateful resiliency for protocols that run over the IGP such as MPLS. The 7450 ESS supports non-stop services for VPLS and VLL using tunnels created by label distribution protocol (LDP), targeted LDP, generic routing encapsulation (GRE) and static label switched path (LSP) tunnels.
•Graceful Restart Helper — This feature improves availability in cases where the Alcatel-Lucent 7450 ESS is peering with routers not otherwise capable of non-stop routing or services.
“As service convergence over IP networks accelerates, high availability and reliability become important not only for business services, but also for demanding residential applications such as IPTV and online gaming. High availability is moving from being a requirement for business services, to a requirement for all services.”
MARK SEERY, RHK.
Figure 5. The Evolution of Ethernet Services to Carrier Reliability
Business Services and Triple Play
7450 ESS is the industry’s first Ethernet service switch with carrier high availability
7450 ESS
5.Non-stop Services (NSS)
• Zero service downtime with NSS (VPLS, VLL)
4.MPLS Fast Re-Route
•Delivers sub 50 ms failover with thousands of services enabled
Internet Access
Beginning
Minutes
00:0X:XX:XX
3.802.1w Rapid Spanning Tree Protocol (RSTP)
802.1s Multiple VLAN Spanning Tree (MVST)
• Re-convergence time can range from subsecond to subminute
2.802.3ad Link Aggregation
•Ethernet connections combined to load share and provide better resiliency
1.802.1D Spanning Tree
•Spanning tree protocol (STP) solves loops by removing all redundant paths
8 Alcatel-Lucent 7450 Ethernet Service Switch
