Zte ZXR10 GER, Руководство пользователя

Страница: 343 / 412

Chapter 23 Traffic Engineering Configuration
Confidential and Proprietary Information of ZTE CORPORATION 321
„
Label-switched path (LSP) tunnels, which are signaled
through RSVP, with traffic engineering extensions. LSP
tunnels are represented as IOS tunnel interfaces, have a
configured destination, and are unidirectional.
„
A link-state IGP (such as IS-IS) with extensions for the
global flooding of resource information, and extensions for
the automatic routing of traffic onto LSP tunnels as
appropriate.
„
An MPLS traffic engineering path calculation module that
determines paths to use for LSP tunnels.
„
An MPLS traffic engineering link management module that
does link admission and bookkeeping of the resource
information to be flooded.
„
Label switching forwarding, which provides routers with a
Layer 2-like ability to direct traffic across multiple hops as
directed by the resource-based routing algorithm.
One approach to engineer a backbone is to define a mesh of
tunnels from every ingress device to every egress device. The
IGP, operating at an ingress device, determines which traffic
should go to which egress device, and steers that traffic into the
tunnel from ingress to egress. The MPLS traffic engineering path
calculation and signaling modules determine the path taken by
the LSP tunnel, subject to resource availability and the dynamic
state of the network. For each tunnel, counts of packets and
bytes sent are kept.
Sometimes, a flow is so large that it cannot fit over a single link,
so it cannot be carried by a single tunnel. In this case multiple
tunnels between a given ingress and egress can be configured,
and the flow is load shared among them.
MPLS Basic Configuration
Below procedure gives information about MPLS basic
configuration.
Router CLI (Privileged Mode) has been accessed.
1. To configure device for enabling MPLS TE signaling use
mpls
traffic-eng tunnels in global configuration mode as shown
in Table 366.
T
A B L E
3 6 6 M
P L S
T
R A F F I C
C
O M M A N D
Command
Format
Command
Mode
Command Function
mpls
traffic-eng
tunnels
Global config This enables MPLS TE
Result: This configures MPLS TE signaling.
Tunnels Mesh
Purpose
Prerequisite
Steps