Cisco uBR7100 Series Manual de usuario descargar pdf (Pagina 7)

Cisco Systems

Page 7 of 12

Standards-Based

The Cisco uBR7100 Series provides a standards-based

platform.Productoptionsletyouinstallequipmenttoday

with the assurance that future

technologicalimprovements are accommodated.

Flexible, Easy-to-Use, All-Inclusive Product Design

The Cisco uBR7100 Series offers maximum flexibility.

The product simultaneously supports two-way and

telephone return on the same downstream channel based

on the Cisco IOS software ordered.

The product supports Simple Network Management

Protocol (SNMP) for standards-based network

management. Other conﬁguration options include telnet

and serial access to the Cisco uBR7100 Series via a

console or auxiliary port connection.

The Cisco uBR7100 Series ships with Cisco Network

Registrar

version 3.5 at introduction. Cisco Network

Registrar provides policy-based, robust, and scalable

Domain Name System (DNS) and Dynamic Host

Conﬁguration Protocol (DHCP) services that form the

basis for a complete cable modem or set top box

provisioning system. Cisco Network Registrar is used

both as a standalone product and as a component of the

Cisco Subscriber Registration Center (CSRC).

The Cisco uBR7100 Series works withthe Cisco Building

Broadband Service Manager(BBSM) system which offers

an integrated, single-vendor MxU solution. Together, the

Cisco uBR7100 Series and the Cisco BBSM deliver a

cable-based in-building platform that supports

plug-and-play Internet access, self-service activation,

tiered service levels, and integrated billing. The Cisco

BBSM uses Network Address Translation (NAT) to

connect static IP conﬁgurations and DHCP for dynamic

conﬁgurations. The Cisco BBSM links to MxU property

managementsystems(PMS) tosupporttiered servicesand

remote port-by-port manageability.

Troubleshooting Tools and Commands

The Cisco uBR7100 Series supports troubleshooting with

detailed traffic statistics by protocol and IP address.

Troubleshooting commands available to diagnose

problems include two key areas:

• Cable modems andtheRFcable plant—CiscouBR7100

Series software includes a ﬂap list command that helps

isolateproblemsbetweenthecableplant(suchasingress

noise or incorrect power levels) or speciﬁc cable

modems. A ﬂap is deﬁned as a cable modem being

registered on the CMTS, deregistering, and then

immediately reregistering. With the ﬂap list, you can

quicklylearnhowto characterize trouble patternsinthe

network, determine which ampliﬁer or feeder line is

faulty, distinguish an upstream from downstream path

problem and isolate an ingress noise impairment from a

plant equipment problem.

• Transmission Control Protocol/Internet Protocol

(TCP/IP)—The system supports tracing and debugging

DHCP related messages on an administrator-deﬁned

CMTS network interface; tracing and debugging all

Media Access Control (MAC) layer DOCSIS messages

for a deﬁned MAC address; monitoring speciﬁc

processes through available debugging commands.

Traffic Shaping Mechanisms

The Cisco uBR7100 Series lets you specify policies to

handle trafﬁc exceeding bandwidth allocation. The

productofferstrafﬁc-shapingcapabilities to limitthedata

rate to and from a cable modem. Cable is a shared

medium. Rate limiting ensures no single cable modem

consumes all of the channel bandwidth.

Rate limiting also lets you conﬁgure different maximum

data rates for cable modems. Users requiring higher peak

rates and willing to pay for this can be conﬁgured with

higher peak rate limits over others that do not require

differentiated services.

The Cisco uBR7100 Series reduces the chance that data

must be retransmitted to hosts on the cable plant. When

rate limiting cable modems on the network, the

Cisco uBR7100Seriessoftwaretypicallydropspacketsto

enforcetheratelimit.Dropping packetsfromarequesting

cable modem causes the host sending the data to

retransmit. Retransmitted data wastes bandwidth on the

network.Ifboth thehostssendingandrequestingdataare

on the cable plant, the upstream bandwidth is wasted as

well. The Cisco trafﬁc shaping feature delays the

scheduling of the upstream packet, which in turn causes

the packet to be buffered on the cable CPE device instead

of being dropped. This allows the user’s TCP/IP stack to

1 2 3 4 5 6 7 8 9 10 11 12

Comentarios a estos manuales

Sin comentarios

Cisco uBR7100 Series Manual de usuario Pagina 7

Comentarios a estos manuales

Relacionado con productos y manuales para Redes Cisco uBR7100 Series