Cisco 700 series Guía de instalación

CHAPTER

Overview of Cisco 700 Series Routers 1-1

Overview of Cisco 700

Series Routers

Cisco 700 series routers connect Ethernet LANs to other networks over Integrated Services

Digital Network (ISDN) Basic Rate Interface (BRI) lines. Cisco 700 series routers offer

multiprotocol routing capability between WAN and LAN ports and can function as

transparent bridges.

This chapter contains the following sections:

•Product Features

•Security Features

•SNMP Support

•Supported MIBs

•Supported RFCs

•Router Panels

•Speciﬁcations

For more information on the commands described in this chapter, refer to the Cisco 700

Series Command Reference.

1-2 Cisco 700 Series Router Installation Guide

Product Features

This section describes the major features of Cisco 700 series routers.

Dial-On-Demand Routing

Cisco 700 series routers include dial-on-demand routing (DDR). This allows the router to

dynamically initiate calls to remote devices across ISDN BRI lines as trafﬁc demands. The

router also terminates ISDN connections based on the level of the trafﬁc demanded on the

ISDN line and the dynamic routing parameters.

SPID and Switch Automatic Detection

The automatic service proﬁle identiﬁer (SPID) and switch detection feature simpliﬁes the

use of ISDN terminal equipment and makes the equipment easier to use with fewer

parameters to enter. With this feature, the user only has to enter the local directory numbers

with area code. No SPID number or switch type is required from the user. The command

used is the set autodetection command.

The automatic detection feature only applies to ISDN switches for the USA and Canada,

usually an AT&T 5ESS Custom, DMS-100, NI-1, or NI-2 switch. The automatic detection

mechanism might not work with any other switch, such as a Siemens switch. The automatic

detection feature is only implemented in the U. S. image.

TFTP ClientCisco 700 series routers support the use of a Trivial File Transfer Protocol (TFTP) client.

This feature increases TFTP ﬁle transfer efﬁciency and reliability. The swl tftp command

loads the TFTP client software from the console port.

Overview of Cisco 700 Series Routers 1-3

Product Features

Proﬁle-Based User Name and Password

Remote users often have multiple service providers. Connecting to different service

providersmightrequire differentuser namesand passwords.Previousreleasesof Cisco 700

software used the same user name and password for all proﬁles when making outgoing

Point-to-Point Protocol (PPP) connections. Cisco 700 series router software Release 4.1(1)

allows different proﬁles to have different user names and passwords.

In previous releases, the setsystemnamecommand set the system prompt and the PPP user

namewhen makingoutgoing PPPconnections.Differentproﬁlescan nowusedifferentuser

names when dialing out. A new proﬁle level command, the set ppp clientname command,

has been created for this purpose.

Bandwidth Allocation Control Protocol and Bandwidth Allocation Protocol

The Bandwidth Allocation Control Protocol (BACP) and the Bandwidth Allocation

Protocol (BAP) deﬁne a set of rules to control dynamic bandwidth allocation gracefully by

managing the number of links in a PPP multilink bundle. BACP consists of a network

control protocol that negotiates once per PPP multilink bundle while BAP deﬁnes a set of

request and response messages to manage the links.

Cisco 700 series router software Release 4.0(2) already supports dynamic management of

both B channels with the demand feature. The implementation of BACP and BAP allows

Cisco 700 series routers to coordinate and negotiate the actual allocation and deallocation

of the second channel. The parameters are set using the demand command and the timeout

command.

BACP is only implemented on a BRI interface. A Multilink PPP has to be negotiated for

BACP to be functional.

If a data call is bumped to accommodate a voice call and if BAP negotiation is enforced,

the user might experience a short audio idle period before a B channel becomes available.

The user might not be able to connect the voice call if the peer declines to give up the link.

This happens when the set ppp bacp linkdrop negotiation command is set to ON.

1-4 Cisco 700 Series Router Installation Guide

Product Features

NetBIOS Over TCP/IP Packet Filter

A generic ﬁlter capability on the Transaction Control Protocol/User Datagram Protocol

(TCP/UDP) packets allows users to ﬁlter NetBIOS packets generated by application

programs. Use the set ip ﬁlter command to control this feature.

NetBIOS Name Spooﬁng

When a WINS client sends out a NetBIOS Name query, the router can answer a NetBIOS

name query in place of the WINS server. If the router cannot answer, the router forwards

the query packets to the server, which forwards the response to the client. If spooﬁng is set,

the router keeps a local database of up to 100 Domain Name System (DNS) name entries

and has an aging scheme to age out the unused name entries.

Automatic Conﬁguration From BOOTP

The automatic conﬁguration feature allows the Cisco 700 series router to obtain a

conﬁguration ﬁle from a remote server using BOOTP protocol. Upon power-up, the router

examines the Auto_Conﬁg ﬂag stored in NVRAM. If the Auto_Conﬁg ﬂag is FALSE, the

router initiates a BOOTP request for an IP address from the BOOTP server. If the BOOTP

server ﬁnds a matching MAC address, the server returns an IP address and a conﬁguration

ﬁle name. The router initiates TFTP to download a conﬁguration ﬁle.

After successfully loading the conﬁguration ﬁle, the router sets the Auto_Conﬁg ﬂag to

TRUE in NVRAM. In subsequence power-up operations, if the Auto_Conﬁg is TRUE, the

router does not initiate BOOTP. The set default command resets the Auto_Conﬁg ﬂag to

FALSE.

The automatic conﬁguration feature only works on the Ethernet interface. If the router does

notreceive aBOOTPresponse fromthe serverwithin 5 secondsofthe ﬁrst BOOTPrequest,

the router gives up and the Internet Protocol (IP) information must be conﬁgured manually.

DHCP Server

DHCP automates IP addressing and reduces the number of IP addresses a site might

require. Cisco 700 series routers can function as a dynamic host conﬁguration protocol

(DHCP) server. (The router can also act as a DHCP relay, but not both at the same time.)

Overview of Cisco 700 Series Routers 1-5

Product Features

When a DHCP server is enabled and conﬁgured, it assigns and manages IP addresses from

aspeciﬁedaddress pooltoDHCP clients.Theoptions supportedbythis serverare sufﬁcient

for Windows 95 clients. If more IP addresses or options are required, a commercial DHCP

server (for example, Windows NT) should be used.

DHCP Relay Agent

Cisco 700 series routers can function as a DHCP relay agent. (The router can also act as a

DHCP server, but not both at the same time.) When conﬁgured, Cisco 700 series routers

relay DHCP requests and responses between DHCP clients and a speciﬁed DHCP server.

Use the set dhcp relaycommand, where the IP address is the address of the server to which

DHCP requests will be forwarded.

Port Address Translation

Cisco 700 series routers support port address translation (PAT) allowing a designated

private IP network to communicate with the outside world. When conﬁgured, Cisco 700

series routers translate source addresses from an IP private network to a single, global,

unique IP address before forwarding the packets to the outside world.

IP Address Assignment Through IPCP

The router can be assigned an IP address from the remote device using Internet Protocol

Control Protocol (IPCP) address negotiation. The implementation is based on RFC1332. It

supportsIPCPoptions 1and 3. (It doesnot support option2, TCP/IP HeaderCompression.)

IP unnumbered is also supported. IPCP address negotiation is on by default in any proﬁle

conﬁgured for IP routing. This feature does not support assigning addresses to remote

devices.

IP RIP Update Linkup

The IP Routing Information Protocol (RIP) Update Linkup option for IP RIP enables better

interoperability between the router and Cisco IOS software. If the IP RIP update is set to

link up for a WAN proﬁle, the IP RIP data is sent as soon as a connection is established and

1-6 Cisco 700 Series Router Installation Guide

Product Features

again every 30 seconds for as long as the connection exists. If the connection does not exist,

no RIP data is sent. This prevents the line from being brought up by RIP packets where the

update is periodic.

Force Dynamically Negotiated IP Addresses

When this feature is on, the negotiated IP address is assigned to the Standard or the

user-deﬁned proﬁle (whichever proﬁle is used to place the call). It also tells the software to

try any IP address conﬁgured for this proﬁle in the IP address negotiation.

When this feature is off and the internal proﬁle does not contain an address, the negotiated

IP address is automatically assigned to the Internal proﬁle by the system. If the Internal

proﬁle contains an address, it will be assigned to the user-deﬁned proﬁle from which the

call was initiated. The parameters are set using the set ppp address negotiation command.

Fee Pulse Mode

Fee Pulse Mode manages the ISDN connection based on the paid periods of time. If other

thresholds indicate a call should be dropped due to low trafﬁc, Fee Pulse Mode maintains

the connection until the current paid period has expired. Therefore, you are not paying full

price for part of a connection period. This feature is available only for NET3 (same as

ETSI) switch types, and you must subscribe to Advice of Charge-During Active Call

(AOC-D) supplementary service.

If the feature is enabled and idle time expires, the router checks the remaining time in the

current paid period. The router maintains the connection until the end of the paid period,

minus the disconnect time required to terminate the PPP and ISDN links.

If the idle time expires too close to the endof the paid period to close the connections before

the end of the paid period, the router extends the connection to the end of the next paid

period, minus disconnect time.

Call TransferCisco 700 series routers can transfer an active voice call to another telephone number. For

more information on conﬁguring call transfer, refer to the chapter “ISDN and Analog

Telephone Devices.”

Overview of Cisco 700 Series Routers 1-7

Product Features

Call Forwarding (Sweden and Finland)

Call forwarding supplementary service has been added for Sweden and Finland (NET3).

Call forwarding is implemented differently in the European countries. The version

implemented here uses keypad procedures and is only partly ETSI-compliant.

Three-Way Call Conferencing

Cisco 700 series routers can add another party to an active voice call. You can connect three

people using this feature. For more information on conﬁguring three-way call

conferencing, refer to the chapter “ISDN and Analog Telephone Devices.”

Data Call Button (Cisco 770 Series Router Only)

The data call button, located on the front panel of Cisco 770 series routers, provides an

alternative to establishing or disconnecting data calls through the command interface. The

data call button performs in Make or Break mode. If no B channels are connected for data,

and at least one B channel is available, the button works in Make mode and attempts to

establish a call. When at least one B channel is connected for data, the button works in

Break mode, disconnecting the call. Table 1-1 summarizes the operation of the Cisco 770

series data call button.

Table 1-1 Cisco 770 Series Data Call Button Operation Summary

Second Number Fail-Over

Cisco 700 series routers can place a call to a backup telephone number when an outgoing

call is not successful because the receiving side is busy or does not answer. Cisco 700 series

routers support second number fail-over for manual and auto-data calls. The parameters are

set using the set backupnumber command.

Current

Status No call up 1 data call

only 2 data calls 1 voice

call only 2 voice

calls 1 data and 1

voice call

Switch

Operation Make a

data call Disconnect

the data call Disconnect

both data calls Make a

data call No

action Disconnect

the data call

1-8 Cisco 700 Series Router Installation Guide

Product Features

IPX SupportTo improve performance, only the services deﬁned in Novell IPX Router Speciﬁcation

107–000029–001 are supported, and a maximum of 400 IPX route entries and 200 IPX

SAPs are allowed. If you need more route and SAPs entries, software Release 4.0(1) and

higher supports set ipx sap helper and set ipx gateway commands.

IPX Ping The IPX ping feature allows you to determine if the speciﬁed IPX node is alive and

reachable. Cisco 700 series routers only generate Novell IPX format ping packets when

IPX ping is sourced from the router. The response by the Cisco 700 series router to a Novell

IPX ping packet is in Novell IPX format. The response by the Cisco 700 series router to

Cisco IPX ping packets is in Cisco IPX format. (If a Novell NetWare server is pinged, the

speciﬁed server must be running the IPXPING.NLM to respond to the ping. This NLM

[NetWare Loadable Module] is part of an IPX Upgrade [IPXRTR.EXE] to NetWare

servers.) The parameters are set using the ipxping address command.

Default IPX Route

Cisco 700 series routers can route IPX packets to an established default gateway if no

learned or static route can be found for the destination in the routing table. The parameters

are set using the set ipx gateway command.

IPX SAP Filtering

IPX SAP ﬁltering controls which services are added to the Cisco 700 series router Service

Advertisement Protocol (SAP) table. You can specify ﬁlters per type range or socketrange.

Before a service is added to the SAP table, the service type and socket number for the

service is checked against the existing ﬁlters. If the type and socket ranges match any of the

existing ﬁlters, service is permitted or denied based on the action speciﬁed in the action

ﬁeld of the ﬁlter. Otherwise (no ﬁlter matches the incoming service), the service is blocked.

If no ﬁlter is conﬁgured, all SAPs are permitted. The parameters are set using the set ipx

ﬁlter sap command. The maximum number of SAP ﬁlters is 20.

Overview of Cisco 700 Series Routers 1-9

Security Features

Service Advertising Protocol (SAP) Helper

Cisco 700 series routers can forward to a speciﬁed router or server (instead of responding

to them) all SAP get-nearest-service request broadcast packets and get general service

request broadcast packets to an IPX router or IPX server as unicast packets. Cisco 700

series routers forward these request packets without looking in the local SAP table. The

parameters are set using the set ipx sap helper command.

Route Summarization

Route summarization is provided on IP RIP Version 2 (only Version 2 provides the required

subnet mask information). When route summarization is set to auto, the router summarizes

routes that cross the classful boundary to a single route based on the classful boundary.

When route summarization is set to off, the router uses the normal RIP Version 2 routes

with variable-length subnet masks (VLSMs). The default setting for RIP summarization is

OFF. Use the set ip rip summarization command to control this feature.

Data Compression

Cisco 700 series routers support data compression using the compression algorithm

QIC-122 standard, Stacker LZS. Data compression is a software conﬁguration option that

optimizes the ISDN line bandwidth. Packets are compressed before being sent onto the

ISDN line. After they arrive at their destination, the packets are decompressed and sent on

to the remote LAN.

Security Features

Cisco 700 series routers provide the following security features:

•PPP authentication support, including Password Authentication Protocol (PAP) and

Challenge Handshake Authentication Protocol (CHAP)

•Password security for local and remote conﬁguration access

•IP ﬁltering based on source and destination addresses, source and destination ports, and

packet types

1-10 Cisco 700 Series Router Installation Guide

SNMP Support

Leased Line Authentication Requirement Removed

For64-kbpsor 128-kbpsleased lineconnections,previousversionsofthe softwarerequired

PAP/CHAP authentication to identify the corresponding proﬁle. In software Release 4.0(1)

and higher, the authentication sequence is no longer required for leased line connections.

To eliminate the need for authentication, a user-deﬁned proﬁle named leasedline must be

present and deﬁned. If this proﬁle is not present upon call connect, the router requires

authentication to select the correct proﬁle. If the call cannot be authenticated, the router

defaults to the Standard proﬁle.

Within the user-deﬁned proﬁle called leasedline, verify that PPP authentication is set to

none. The switch types that support this feature are PERM64 and PERM128.

SNMP Support

Cisco 700 series routers support Simple Network Management Protocol (SNMP).

SNMP Community Names

Cisco 700 series routers support the following SNMP community names:

•public

•proxy

•private

•regional

•core

These community names are read-only and cannot be changed. Cisco 700 series routers do

not support SNMP set commands.

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Este manual sirve para los siguientes modelos

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