Cisco ASR 5000 Series, Обзор продукта

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CDMA2000 Wireless Data Services
Features and Functionality—Base Software ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
Border Gateway Protocol version 4 (BGP-4): The system supports a subset of BGP (RFC-1771, A Border
Gateway Protocol 4 (BGP-4)), suitable for eBGP support of multi-homing typically used to support
geographically redundant mobile gateways, is supported.
EBGP is supported with multi-hop, route filtering, redistribution, and route maps. The network command is
support for manual route advertisement or redistribution.
BGP route policy and path selection is supported by the following means:
Prefix match based on route access list
AS path access-list
Modification of AS path through path prepend
Origin type
MED
Weight
Route Policy: Routing policies modify and redirect routes to and from the system to satisfy specific routing
needs. The following methods are used with or without active routing protocols (i.e. static or dynamic routing)
to prescribe routing policy:
Route Access Lists: The basic building block of a routing policy, route access lists filter routes based
upon a specified range of IP addresses.
IP Prefix Lists: A more advanced element of a routing policy. An IP Prefix list filters routes based
upon IP prefixes.
AS Path Access Lists: A basic building block used for Border Gateway Protocol (BGP) routing, these
lists filter Autonomous System (AS) paths.
Route Maps: Route-maps are used for detailed control over the manipulation of routes during route selection or
route advertisement by a routing protocol and in route redistribution between routing protocols. This detailed
control is achieved using IP Prefix Lists, Route Access Lists and AS Path Access Lists to specify IP addresses,
address ranges, and Autonomous System Paths.
Equal Cost Multiple Path (ECMP): ECMP allows distribution of traffic across multiple routes that have the
same cost to the destination. In this manner, throughput load is distributed across multiple path, typically to
lessen the burden on any one route and provide redundancy. The mobile gateway supports from four to ten
equal-cost paths.
Important:
For more information on IP Routing configuration, refer Routing chapter in System Enhanced
Feature Configuration Guide .
Management System Overview
The system's management capabilities are designed around the Telecommunications Management Network (TMN)
model for management -- focusing on providing superior quality Network Element (NE) and element management
system (Web Element Manager) functions. The system provides element management applications that can easily be
integrated, using standards-based protocols (CORBA and SNMPv1, v2), into higher-level management systems --
giving wireless operators the ability to integrate the system into their overall network, service, and business
management systems. In addition, all management is performed out-of-band for security and to maintain system
performance.