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The ZebOS® MPLS switching modules provides a complete solution for the rapid integration of MPLS functionality into enterprise, edge, and core communications equipment. ZebOS supports both MPLS Traffic Engineering and MPLS VPN capabilities, as well as extensions for the support of DiffServ and DiffServ Traffic Engineering. The ZebOS MPLS Switching Modules support the following:
The Traffic Engineering (TE) extensions use RSVP-TE and CR-LDP dynamic signaling protocols to communicate to the ZebOS MPLS Forwarder or a third party MPLS forwarder. The RSVP-Traffic Engineering extension enables MPLS to scale into large and complex IP-based communications equipment. In addition, ZebOS ARS supports Constrained Shortest Path First (CSPF) algorithm. Using Traffic Engineering Database and pre-existing LSPs, the CSPF Module calculates on demand an optimum Explicit Route (ER) based on the specified constraints. The resulting ER is used by a signaling protocol, either RSVP-TE or CR-LDP, to set up Label Switched Paths (LSP). Providing VPN services can add significant value to provider edge equipment. These solutions give security needed by VPN service providers, while at the same time building a scalable infrastructure that can take advantage of IP routing, traffic engineering (TE), and MPLS switching features. The Advanced Routing Suite offers both Layer 2 and Layer 3 VPN Modules. Through the ZebOS MPLS Forwarder and LDP Modules, the ARS offers a Layer 3 MPLSVPN solution by tightly integrating BGP-VPN extensions; it provides address space and routing separation through the use of per VPN routing tables (VRF) and MPLS switching in the core.
Figure 2: MPLS-VPN and Transparent LAN Services Optional MPLS Layer 2 VPN and VPLS Protocol Modules that enhance MPLS by providing transparent LAN access between VPN sites are available. The ZebOS MPLS Layer 2 Virtual Circuit (VC) Module implements draft-ietf- 12circuit-transmpls-08.txt and draft-ietf-12circuit-encapmpls- 04.txt and provides a point-to-point layer 2 virtual circuit that allows extension of a LAN segment across a MPLS cloud. The ZebOS VPLS (virtual private LAN services) Module includes MPLS Layer 2 VC, but also implements draft-lasserre- vkompella-ppvpn-vpls-04.txt, adding support for hub and spoke VPN and mesh VPN topologies. It combines the benefits of MPLS Layer 2 Virtual Circuit (VC) with the flexibility and scalability of multipointtomultipoint VPN. In order to provide a flexible DiffServ over MPLS solution, the ZebOS DiffServ Module is available as an extension to the ZebOS RSVP-TE Module. The ZebOS DiffServ Module enables network traffic to be specified and prioritized by class so that certain kinds of traffic, for example voice traffic, get precedence over other types of traffic. DiffServ employs a sophisticated policy to determine how to forward network data, so it is more advanced than earlier QoS or Type of Service (ToS) protocols. Since DiffServ by itself lacks the ability to efficiently use network transmission resources, IP Infusion has also developed a DiffServ- Aware MPLS Traffic Engineering (DiffServ-TE) Module. The ZebOS DiffServ-TE Module performs traffic engineering per DiffServ class rather than at an aggregate level. By combining DiffServ with MPLS Traffic Engineering, routing devices can simultaneously classify and prioritize traffic and achieve fined-grain optimization of transmission resources. |
