Riverstone scales VPLS

Riverstone Networks this week rolled out several enhancements for its RS and 15000 series metro Ethernet routers, including a more scalable version of virtual private LAN services (VPLS).

Hierarchical VPLS (HVPLS) allows service providers to scale VPLS networks to hundreds of thousands of subscribers by enabling them to establish hierarchies of connectivity. These hierarchies simplify network configuration by limiting meshed circuits to the core of the network, which also reduces signaling overhead, Riverstone says.

It also provides a more economical means of delivering high quality video services by pushing video packet replications for multicasting further out to the edge, Riverstone says.

VPLS enables carriers to configure multipoint Ethernet VPNs over a mesh of MPLS label-switched paths (LSPs). The technology is intended to make Ethernet services as resilient, scalable and QoS-friendly as legacy PVC services like frame relay and ATM.

In addition to adding HVPLS to its routers, Riverstone has doubled the density of line cards on the 15000 router, added support for dual-homed edge and MTU (Maximum Transmission Unit) devices, and extended OAM (operations, administration, management) capabilities to include HVPLS and support for Dorado Software's Redcell configuration management. The higher density line cards include dual-port 10 Gigabit Ethernet and 24-port Gigabit Ethernet modules.

The OAM enhancements include ping and traceroute capabilities for both HVPLS and MPLS LSPs, and HVPLS loop detection.

Future enhancements to the 15000 and RS routers will include interdomain VPLS, interarea traffic engineering, and point-to-multipoint LSP support, which are all designed to improve geographic scope and intercarrier QoS.

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