Zte ZXR10 8900E series, Описание продукта

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ZXR10 8900E series Core Switch Product Description
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MPLS TE provides bandwidth guarantee for traffic. Bandwidth reservation, priority
definition and bandwidth preemption mechanisms are introduced for key traffic. It
can ensure the transmission traffic will not be discarded because the link bandwidth
is insufficient.
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MPLS TE can also guarantee stable and reliable transmission of network traffic:
when the link or transmission node fails, fast link switching can be achieved via
MPLS TE FRR and MPLS TE tunnel backup technology. Besides, it also supports
LSP full path protection and thus can largely reduce the impact on the traffic.
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Support MPLS VPN over TE; provide LDP over RSVP; TE tunnel provides
bandwidth guarantee and isolation for MPLS VPN service.
3.3.3 MPLS L2 VPN
MPLS L2 VPN can be divided into two classes. The first is called VPWS (Virtual Private
Wire Service), which realizes communication between the sites in VPN by point-to-point
connection. This mode is mostly used for users using ATM and FR connection. The
connection between the users and network provider are not easy to be maintained, but
the services are transmitted on the IP backbone network of the network provider after
encapsulation. The second is called VPLS (Virtual Private LAN Service). The operator’s
network emulates the function of LAN SWITCH or bridge, connecting all LANs of the
users to form a simple bridge LAN. The major difference of VPLS and VPWS is that
VPWS only provides point-to-point service while VPLS provides point-to-multipoint
service. That is, the CE device in VPWS selects a virtual line and sends the data to a
user site; the CE device in VPLS only simply sends the data to all destinations to the PE
devices connected to it.
Figure 3-6 Basic VPWS network model
The most direct way to create L2 VPN is to create VC between CP and PE, and the
operator’s network uses LSP of MPLS to bear these connections, as shown in Figure 3-6.
MPLS TE can be adopted to meet the QoS requirement of the users. In this scheme, the
workload of configuring PVC between CE and PE and MPLS LSP for bearing is heavy.
Substantial LSP will occupy a lot of resource of LSR, which will reduce network