Analyzing the System Boot Dialog

To view the boot sequence through a terminal session, you must have a console connection to the access server before it powers up. Caution Always boot the dial shelf before the router shelf. The DSC card checks the dial shelf inventory, which requires extra time to boot up (60 to 120 seconds). The router shelf depends on the DSC card for the dial shelf inventory report. The following boot sequence occurs. Event numbers and comments are inserted in the example to describe the boot sequence....

Async Data Comm Model

Figure 4-1 shows how traditional DTE-to-DCE relationships map to a Cisco network access server (NAS). Data terminal equipment (DTE) uses data communication equipment (DCE) to send data over the PSTN. In the context of RS-232 and Cisco IOS The DTE is the client PC and the Cisco IOS TTY lines. The DCE is the client modem and the modem inside the NAS. The dashed line between the DCEs is the modem carrier running on top of the voiceband circuit through the PSTN. RS-232 (whether physical or logical)...

Basic Rules for Modem Autoconfigure

The following list describes the basic rules 1. Never use the modem autoconfigure discovery command. Applying specific modemcaps reduces the risk of error. 2. Always use the modem autoconfigure type modem-name command. This command improves your modem's performance. See CSCdk15302 for an explanation. The modem autoconfigure type mica command can be used to reset any integrated modem (not only MICA), back to its factory defaults. The keyword mica is a built-in modemcap that only functions as...

Call Processing Components

As shown in Figure 3-2, the following components are used to process a call Client modems and ISDN routers dial into the access server through the PSTN. Asynchronous PPP calls (analog) connect to modems inside the access server. Each modem inside the access server provides a corresponding TTY line and asynchronous interface for terminating character and packet mode services. Asynchronous interfaces clone their configurations from a group-async interface. Synchronous PPP calls (digital) connect...

Checking the Initial Running Config

The Cisco IOS creates an initial running configuration. Inspect the configuration to get familiar with the default settings. service timestamps debug uptime service timestamps log uptime no service password-encryption controller T1 0 clock source line primary controller T1 1 clock source line secondary controller T1 2 clock source internal controller T1 3 clock source internal interface Ethernet0 no ip address shutdown interface FastEthernet0 no ip address shutdown transport input none line 1...

Cisco IOS Line Side Inspection

To display the current modem-hardware states applied to a specific Cisco IOS line, enter the show line tty number command. The states of each logical RS-232 pin change according to line conditions and modem events. The following shows a line-side inspection of the idle state for TTY line 1 Tty Typ Tx Rx A Modem Roty AccO AccI Uses Noise Overruns Int I 1 TTY - inout - - - 2 0 0 0 - Line 1, Location , Type Length 24 lines, Width 80 columns Status No Exit Banner Capabilities Hardware Flowcontrol...

Commissioning the Cisco AS5800 Hardware

This section describes how to configure Cisco AS5800 to support terminal EXEC shell services and login prompts for client modems. The following subsections are provided Understanding the Basic Hardware Architecture Task 1. Verifying Basic Setup Task 2. Configuring Cisco IOS Basics Task 3. Enabling the T3 T1 Controllers Task 4. Configuring the Serial Interfaces Task 5. Configuring Modems and Lines Task 6. Enabling IP Basic Setup Task 7. Testing Asynchronous EXEC Shell Connections Task 8....

Configuring Basic IP

To commission a basic dial access service Configure two loopback interfaces. Bring up one Fast Ethernet interface. Add an IP route to the default gateway. Step 1 Assign the IP addresses, and create an IP route to the default gateway interface Loopback0 ip address 172.22.99.1 255.255.255.255 interface Loopback1 ip address 172.22.90.1 255.255.255.0 interface FastEthernet0 1 0 ip address 172.22.66.23 255.255.255.0 ip route 0.0.0.0 0.0.0.0 172.22.66.1 Interface loopback 0 Identifies with a unique...

Configuring Local AAA Security

Configure authentication, authorization, and accounting (AAA) to perform login authentication by using the local username database. The login keyword authenticates EXEC shell users. Additionally, configure PPP authentication to use the local database if the session was not already authenticated by login. AAA (called triple A) is the Cisco IOS security model used on all Cisco devices. AAA provides the primary framework through which you set up access control on the NAS. In this basic case study,...

Configuring the Host Name Enable Secret and Time Stamps

Assign a host name to the NAS, specify an enable secret password, and turn on time stamps A host name allows you to distinguish between different network devices. Enable secret passwords allow you to prevent unauthorized configuration changes. Encrypted passwords in the configuration file adds greater security to the NAS. Time stamps help you trace debug output for testing connections. Not knowing exactly when an event occurs hinders you from examining background processes. Step 1 Enter the...

Configuring the Loopback Interfaces Ethernet Interface and IP Route

To commission a basic dial access service Create two loopback interfaces Bring up the ethernet interface Add an IP route to the default gateway Step 1 Assign the IP addresses, and create an IP route to the default gateway interface Loopback0 ip address 172.22.99.1 255.255.255.255 interface Loopback1 ip address 172.22.90.1 255.255.255.0 interface Ethernet0 ip address 172.22.66.23 255.255.255.0 ip route 0.0.0.0 0.0.0.0 172.22.66.1 Interface loopback 0 Identifies with a unique and stable IP...

Deployment and Operation Strategy

Table 1-8 describes the deployment and operation task strategy used in this case study. Maui Onions and THEnet share a common strategy. Table 1-8 Deployment and Operation Task Strategy Table 1-8 Deployment and Operation Task Strategy Commissioning the Cisco AS5300 Hardware Cisco AS5300 basic hardware architecture. Supporting EXEC terminal shell services and login prompts for modem clients. Commissioning the Cisco AS5800 Hardware Cisco AS5800 basic hardware architecture. Supporting EXEC terminal...

Dial Planning Questionnaire

Both companies answer a planning questionnaire. Based on their design choices, both companies create a network-service definition. The dial questionnaire in Table 1-1 shows A series of planning design questions and configuration issues Maui Onions' design choices Table 1-1 Dial Services Questionnaire Table 1-1 Dial Services Questionnaire What is the user-growth projection for the next 5 years.1 What is the user-to-line ratio during busy hours Headquarters providing dial-up services Table 1-1...

Enabling Management Protocols Ntp Snmp and Syslog

This section describes how to enable basic management protocols on a Cisco AS5800 and Cisco AS5300 as part of a dial access service. The following sections are provided Understanding Network Management Basics Task 1. Enabling the Network Time Protocol Task 4. Disabling the Logging of Access Interfaces Task 5. Confirming the Final Running-Config This section does not describe how to integrate the Cisco IOS with NT or UNIX servers. Management protocols are described only from the perspective of...

Exploring the Cisco IOS File System

Get familiar with the file system and memory storage areas. The Cisco IOS File System (IFS) feature provides a single interface to The Flash memory file system The network file system (TFTP, rcp, and FTP) Any other endpoint for reading or writing data (such as NVRAM, modem firmware, the running configuration, ROM, raw system memory, Xmodem, and Flash load helper log). IFS first appeared in Cisco IOS Releases 11.3 AA and 12.0. For more information about IFS, refer to the chapter Using the Cisco...

Failed PPP Negotiation Debug and Troubleshooting

Failed authentication is a common occurrence. Misconfigured or mismatched usernames and passwords create error messages in debug output. The following example shows that the username maddog does not have permission to dial into the NAS. The NAS does not have a local username configured for this user. To fix the problem, use the username name password password command to add the username to the local AAA database in the NAS *Sep 24 13 11 28.964 AAA MEMORY create_user (0x63E43558) user 'maddog'...

Fast Switching and Route Caching Statistics

Inspect fast-switching and route-caching performance statistics for the call. Incoming asynchronous calls can be fast switched. However, some features disable fast switching. Inspect the queueing characteristics of the asynchronous interface. Notice that the queueing strategy is first-in-first-out (fifo). 5800-NAS show interface async 1 2 02 Async1 2 02 is up, line protocol is up modem 1 2 02, vdev_state(0x0 0 0 0 0 0 0 0) CSM_OC_STATE, bchan_num (T1 1 0 0 4 6) vdev_status(0x00000001)...

Figure 13 Network Topology Elements

Network element management server 7 (NTP, Syslog, SNMP) Both companies have almost identical network topologies Remote clients use analog modems to access the IP backbone through the PSTN. A Cisco AS5x00 NAS is used as a point-of-presence (POP) to terminate modem calls and Point-to-Point Protocol (PPP) sessions. Maui Onions uses a Cisco AS5300 THEnet uses a Cisco AS5800. PRI lines are used because they provide high throughput (64K) for digital and analog calls. In general, T1 lines can be ISDN...

Figure 22 AS5300 Memory Locations

Inside a Cisco network access server To inspect the file system, enter the commands described in the following list View the different file storage areas and file management functions. Additionally, verify that you have everything that you ordered (for example, 16 MB of Flash memory). The asterisk (*) indicates the current directory. Section 2 Commissioning the Cisco AS5300 Hardware_ Table 2-3 describes the memory locations shown in Figure 2-2. Table 2-3 Memory Location Descriptions Table 2-3...

Figure 24 Matching T1 Controller Settings

Framing ESF Linecode B8ZS PRI-group timeslots 1-24 Step 1 Define the ISDN switch type and T1 controller settings Step 2 Specify the T1 controller settings controller T1 2 framing esf linecode b8zs pri-group timeslots 1-24 controller T1 3 framing esf linecode b8zs pri-group timeslots 1-24 Table 2-5 describes some of the Tl-controller concepts that are applied in the previous example Table 2-5 T1 Controller Terms and Descriptions Table 2-5 T1 Controller Terms and Descriptions Defines the control...

In this Case Study

This case study describes how two companies set up basic modem IP services by using Cisco AS5x00 network access servers. Plan and design a basic IP modem dial-up network. Deploy networking equipment by configuring, verifying, and troubleshooting the Cisco IOS. Prepare for operations by inspecting modem call statistics and enabling basic management protocols. Is for network engineers who work with dial-up access technologies. Assumes that the reader has a CCNA or higher level of familiarity with...

In this Section

This section describes how to configure Cisco AS5300 to support terminal EXEC shell services and login prompts for client modems. The following sub sections are provided Understanding the Basic Hardware Architecture Task 1. Verifying Basic Setup Task 2. Configuring Cisco IOS Basics Task 3. Enabling the T1 Controllers Task 4. Configuring the Serial Interfaces Task 5. Configuring Modems and Lines Task 6. Enabling IP Basic Setup Task 7. Testing Asynchronous-Shell Connections Task 8. Confirming the...

Info

Tech Tip In Figure 4-3, notice that the DSR signal is the DCD signal for the modem. In the scheme of Cisco IOS, the DCD pin on the DCE is strapped to the DSR pin on the Cisco IOS DTE side. What the Cisco IOS calls DSR is not DSR it is DCD. The DCE's actual DSR pin and ring ignore (RI) pin are ignored by the Cisco IOS. Table 4-1 describes how Cisco uses it's RS-232 pins. The signal direction in the table is from the perspective of the DTE (IOS line) Hardware flow control signals (RTS, CTS) Modem...

Inspecting CPU Utilization

Enter the show processes cpu command to investigate high CPU utilization. High utilization causes network performance problems. For example, knowing when the router is running at over 50 utilization is critical. The router might start dropping packets if an unexpected traffic burst comes through or if OSPF gets recalculated. Fast switching reduces CPU utilization. CPU utilization for five seconds 1 0 one minute 0 five minutes 0 CPU utilization for five seconds 1 0 one minute 0 five minutes 0

Inspecting Modem Firmware

2.6.2.0 2.6.2.0 2.6.2.0 2.6.2.0 2.6.2.0 2.6.2.0 2.6.2.0 2.6.2.0 2.6.2.0 2.6.2.0 2.6.2.0 2.6.2.0 2.6.2.o 2.6.2.o 2.6.2.o 2.6.2.o 2.6.2.o 2.6.2.o Find the version of firmware that is bundled with the Cisco IOS. The show modem map command displays the region of NVRAM that identifies where the modems get their firmware from at bootup. The field IOS-Default indicates that the modem gets its firmware from the bundled IOS image. At the end of the display, you see the versions of firmware that the...

Inspecting the Dial Shelf

Verify that the trunk cards and modem cards are up. If the dial shelf controller (DSC) card is down, the feature boards (T3, T1, E1, modem, voice) in the dial shelf cannot communicate to the router shelf. Dial shelf set for auto boot Router Dial shelf set for auto boot Router Possible states include unknown, down, resetting, booting, and up. The Up state means that the card can communicate with the router shelf. Each modem board contains its own DRAM memory. Double-density modem modules (DMM)...

Investigating Memory Usage

Use the show memory summary command to Understand how memory is used for different processor and I O memory processes Identify memory fragmentation and memory leaks. - Memory leak Memory that is not released back to the processor. Memory leaks are indicated by steady decreases of free memory. However, the preferred way to track memory leaks is to monitor the FreeMem variable in the OID MIB. - Memory fragmentation Indicated by the largest block of memory not being equal to the lowest block....

Logical Packet and Circuit Components of a NAS

The NAS functions as a gateway between two different networks A circuit-switched network (for example, the PSTN) A packet-switched network (for example, the Internet) The NAS is half a circuit switch and half a packet switch (router). RS-232 signaling on the line is displayed by the show line command and debug modem command. Figure 4-2 shows the modem access connectivity path. Figure 4-2 Modem Access Connectivity Path Packet interface (Ethernet, frame relay,etc.) _Section 4 Verifying Modem...

RS232 in Cisco IOS

The Cisco IOS variation of asynchronous RS-232 is shown in Figure 4-3. The variation exists between the Cisco IOS line (DTE) and the NAS modem (DCE). Six RS-232 pins exist between each NAS modem and Cisco IOS line. One or more grounding wires also exist on physical RS-232 lines however, these wires do not convey signaling. Each pin controls a different RS-232 signal. The arrows in Figure 4-3 indicate the signal transmission direction. Figure 4-3 Cisco IOS RS-232 Inside a Cisco network access...

S

Network element management server (SNMP) Note The Cisco IOS uses a three-element notation to specify some interface and port locations shelf slot port. Section 3 Commissioning the Cisco AS5800 Hardware_ Understanding the Basic Hardware Architecture I The Cisco 7206 router shelf contains - Port adapters. In this case study, the Cisco 7206 uses Fast Ethernet (FE) 0 1 0 to connect to the IP backbone. - Service adapters (for example, compression and encryption). - A dial shelf interconnect (DSI)...

Scenario Description

Cisco AS5x00 Case Study for Basic IP Modem Services j Enable remote modem users to access IP backbone resources through the public switched telephone network (PSTN). Build an access network foundation that scales to support larger dial implementations for the future. Have almost identical technology requirements and business applications. Therefore, one business scenario diagram is shown for both companies. Figure 1-1 shows the business scenario.

Setting Up a Login Banner

A banner shows you which unit you are connected to (or are connecting through, in the case of a console server). Enter TEXT message. End with the character Unauthorized use is prohibited by law. This is a secured device. Unauthorized use is prohibited by law.

Show Caller Statistics

View individual users and consumed resources on the NAS. Inspect active call statistics for large pools of connections. (Debug commands produce too much output and tax the CPU too heavily.) Display the absolute and idle times for each user. The current values for both of these settings are displayed on the TTY line and the asynchronous interface. Users that have been idle for unacceptably long periods of time can be easily identified. By using this information, you can define timeout policies...

Snip

Verify that PRI is working between the remote switch and the Cisco AS5300. After you enter the debug isdn q921 command, you should see a SAPI message transmitted and received every 10 seconds. A SAPI message indicates that Layer 2 is functioning properly, and there are no apparent cable problems. ISDN Q921 packets debugging is on 53 0 0-NAS Sep 23 04 19 07.887 ISDN Se0 23 TX -> Sep 23 04 19 07.891 ISDN Se0 23 RX < 53 0 0-NAS undebug isdn q921 ISDN Q921 packets debugging is off RRp sapi 0...

Successful PPP Negotiation Debug

The following steps describe how to initiate a PPP test call and interpret a successful debug sequence. Step 1 Enter the appropriate debug commands PPP authentication debugging is on 58 0 0-NAS debug aaa authentication AAA Authentication debugging is on 58 0 0-NAS show debug General OS AAA Authentication debugging is on PPP Step 2 Make sure that your EXEC session receives logging and debug output Step 3 From the client, send a test call into the NAS by using Dial-Up Networking. Figure 5-2 shows...

Table 12 Userto Network Service Definitions

Line requirements for the next 5 years One Cisco AS5300 is required for the first year. Supported operating systems Windows 95, 98, and NT. Maui Onions controls the client types used by its employees. AAA is the highest technology priority. Line requirements for the next 5 years One Cisco AS5800 is required for the first three months. Supported operating systems Windows 95, 98, NT, UNIX, and MacOS. THEnet offers Internet access to all client types. V.90 modem performance is the highest...

Task 1 Enabling the Network Time Protocol

The Network Time Protocol (NTP) provides a common time base for networked routers, servers, and other devices. A synchronized time enables you to correlate syslog and Cisco IOS debug output to specific events. For example, you can find call records for specific users within one millisecond. Comparing logs from various networks is essential for Without precise time synchronization between all the various logging, management, and AAA functions, time comparisons are not possible. An NTP enabled...

Task 2 Configuring Cisco IOS Basics

The following subsections detail the tasks required to apply a basic-running configuration to the NAS 2.1 Configuring the Host Name, Enable Secret, and Time Stamps 2.2 Configuring Local AAA Security 2.3 Setting Up a Login Banner 2.4 Configuring the Loopback Interfaces, Ethernet Interface, and IP Route 2.5 Upgrading to a New Cisco IOS Release Tech Tip Periodically save the configuration by using the copy running-config startup-config command.

Task 2 Configuring IPCP Options

Create a pool of IP addresses to assign to the PC clients dialing in. As the clients connect, they request IP addresses from the NAS. Tech Tip Remote ISDN LANs and remote nodes are primarily differentiated by an IP addressing scheme. Remote LANs can appear as remote nodes by using port address translation (PAT). Step 1 Define the local IP address pool and DNS servers ip local pool addr-pool 172.22.90.2 172.22.90.254 async-bootp dns-server 172.30.10.1 172.30.10.2 For clients using...

Task 2 Configuring Modems Using Modem Autoconfigure

This section describes how to apply a new modem capability (modemcap) to an integrated modem. A modemcap is a database of setup strings that is used by the modem autoconfigure function to change a modem's default settings. A modem's default settings are not optimal. For example, a modem function that you want is not enabled by default. Two separate modem pools need to be set up in the NAS to perform two different tasks. For example, one pool supports V.90. The other pool has a maximum speed set...

Task 2 Enabling Syslog

Note Cisco System's UNIX syslog format is compatible with 4.3 BSD UNIX. Cisco AS5x00 Case Study for Basic IP Modem Services Cisco AS5x00 Case Study for Basic IP Modem Services Step 1 Enable debug timestamps and include the date, time, and milliseconds relative to the local time zone service timestamps debug datetime msec localtime show-timezone service timestamps log datetime msec localtime show-timezone Step 2 Verify that console logging is disabled. If it is enabled, the NAS will...

Task

The SNMP traps generated by Cisco routers provide useful information Potentially harmful environmental conditions The Cisco IOS generates SNMP traps based on the features that the Cisco IOS supports. Figure 7-3 shows the interactions and timing of the SNMP protocol between the EM (SNMP manager) and the NAS (SNMP agent). Traps are unsolicited messages sent from the NAS to the EM. There are four functions of SNMP trap, get request, get next, and set request. Figure 7-3 SNMP Event Interaction and...

Task 3 Configuring LCP Options

The group-async interface is a template that controls the configuration of all the asynchronous interfaces in the NAS. Are lines that can run in PPP mode Use the same number as its corresponding line Save you time and configuration file size by configuring the asynchronous interfaces as a group-async The client PPP framing must match the Cisco IOS interface. Figure 5-1 shows this concept. The following group-async configuration applies to asynchronous interfaces 1 2 00 through 1 10 143...

Task 3 Gathering and Viewing Call Statistics

Making sure that your modems are connecting at the correct connections speeds is an important aspect of managing modems. This section details the following methods for gathering and viewing modem performance statistics 3.1 Using the Cisco IOS EXEC (CLI) 3.2 Using Modem Call-Record Terse If you detect low connection speeds across all the modems, you may have a faulty channelized T1 E1 or ISDN PRI line connection.

Task 4 Disabling the Logging of Access Interfaces

Limit the amount of output that is logged from the group-async interface and ISDN D channels. Carefully choose the data sources for system management purposes. AAA accounting and the modem-call record terse feature provides the best data set for analyzing ISDN remote node device activity. Link status up-down events and SNMP trap signals Occur regularly on access interfaces. Dialer interfaces going up and down is normal behavior and does not indicate a problem. Should not be logged or sent to a...

Task 4 Enabling PPP Autoselect

Enable remote PPP users to dial in, bypass the EXEC facility, and automatically start PPP on the line. line 1 2 00 1 10 143 autoselect during-login autoselect ppp Provide the transparent launching of shell and PPP services on the same lines. Circumvent the need to alert the NAS by pressing the return key. Older versions of Cisco IOS did not have this feature and required the peer to hit return before the username was displayed. Note The autoselect during-login command displays the username...

Task 5 Configuring Modems and Lines

Modems and lines are configured after The ISDN channels are operational POTS telephone calls are successfully routed to the modems Each modem is mapped to a dedicated asynchronous line inside the NAS. After the modem inout command is applied to the lines, the NAS is ready to accept modem calls. AAA security is applied to the lines by the aaa new-model command and aaa authentication login default local command. AAA performs login authentication by using the local username database. The login...

Task 6 Enabling IP Basic Setup

Fine tune the IP routing functions and domain-name services for EXEC shell users. Step 1 Optimize IP routing functions in global configuration mode ip subnet-zero no ip source-route ip classless Table 2-10 describes the previous commands. Specifies that 172.22.0.0 is a legal subnet. Tightens security by ensuring that IP-header packets cannot define their own paths through the network access server (NAS). Ensures that all unknown subnets use the default route. Step 2 In global configuration...

Task 7 Confirming the Final Running Config

After completing the tasks in this section, the Cisco AS5800's final running configuration looks like the following example service timestamps debug datetime msec service timestamps log datetime msec service password-encryption aaa authentication login default local aaa authentication ppp default if-needed local enable secret 5 1 LKgL tgi19XvWn7fld7JGt55p01 username dude password 7 045802150C2E username admin password 7 044E1F050024 shelf-id 0 router-shelf shelf-id 1 dial-shelf modem-pool...

Task 7 Testing Asynchronous EXEC Shell Connections

This task verifies that the following components are working The physical asynchronous data path Basic IP functionality to support EXEC shell sessions The Cisco IOS provides a command-line interface (CLI) called the EXEC. The EXEC Can be accessed by dialing in with a modem Provides access to terminal EXEC shell services (no PPP) to do the following - Troubleshoot possible problems including modem connections - Access other network resources by using telnet During this task, some administrators...

Task 7 Testing Asynchronous Shell Connections

This task verifies that the following components are working The physical asynchronous data path Basic IP functionality to support shell sessions The Cisco IOS provides a command-line interface (CLI) called the EXEC. The EXEC Can be accessed by dialing in with a modem Provides access to terminal-shell services (no PPP) to do the following - Troubleshoot possible problems including modem connections - Access other network resources by using telnet During this task, some administrators try to...

Task 8

After completing the tasks in this section, the final running configuration looks like this Building configuration Current configuration version 12.0 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption aaa authentication login default local aaa authentication ppp default if-needed local enable secret 5 1 gq.d nZwr.ElnV O0nE9U.wZ3D username admin password 7 105B1D1A0A12 username dude password 7 111C0D061817 shelf-id 0 router-shelf shelf-id 1...

Troubleshooting Flow Diagrams

Figure 5-3 provides a flowchart for troubleshooting the following three PPP layers The Link Control Protocol (LCP) and authentication layer The Network Control Protocol (NCP) layer Figure 5-3 Troubleshooting Flow Chart for PPP and Authentication Figure 5-3 Troubleshooting Flow Chart for PPP and Authentication LCP negotiation is a series of LCP packets exchanged between PPP peers to negotiate a set of options and option values when sending data. The LCP negotiation is actually two separate...

Understanding DSIP

The router shelf communicates with the dial shelf using A Fast Ethernet interconnect cable The Dial Shelf Interconnect Protocol (DSIP) For the DSIP command reference and other system management functions, refer to the document Dial and System Management Commands for the Cisco AS5800 at the following URL 58cfeats c5800uas.htm To understand how DSIP functions, enter the commands in the following list Verify that the connection between the router shelf and dial shelf is up. The DSI-Fast Ethernet...

Understanding Network Management Basics

Figure 7-1 shows a logical view of how management protocols interact between the Cisco IOS (client) and the network element management server. The dashed lines indicated different protocols and functions. NTP synchronizes time between network devices. The SNMP element manager (EM) receives SNMP traps from the Cisco IOS. A unidirectional, unsolicited SNMP datagram. The SNMP manager uses SNMP to query variables and set configurations. The Cisco IOS sends logging messages to a syslog daemon....

Understanding the Basic Hardware Architecture

Figure 2-1 shows the logical and physical system architecture for the Cisco AS5300. It illustrates the components used to process a call. I Understanding the Basic Hardware Architecture Figure 2-1 Cisco AS5300 Basic System Architecture Inside a Cisco network access server Dialer interface controlling the D channels Dialer interface controlling the D channels y Serial interface channels S0 1, S0 2. y Serial interface channels S0 1, S0 2. Section 2 Commissioning the Cisco AS5300 Hardware_ Client...

Upgrading to a New Cisco IOS Release

Obtain new Cisco IOS features and more stable code by upgrading to a new Cisco IOS release. Step 1 Display the contents of Flash memory. The following shows that the Cisco IOS image c5300-is-mz.113-7.3.AA is present. 5300-NAS cd flash 5300-NAS dir Directory of flash 1 -rw- 4541080 < no date> c5300-is-mz.113-7.3.AA 16777216 bytes total (12236072 bytes free) 53 0 0-NAS Step 2 Copy the new image from the remote TFTP server into Flash memory. Make sure to specify your own TFTP server's IP...

Using Modem Call Record Terse

Starting with Cisco IOS Releases 11.3AA and 12.0T, modem call records can be sent to syslog and examined to perform statistical analysis. Modulation trends such as V.90 verses V.34 Call time durations (consistent short connection times on a modem, regular Lost Carrier counts) PPP negotiation or authentication failures The following example enables modem call-records and sends the logs to wherever your syslog output goes, for example To the console if you do not have the no logging console...

Using SNMP

Modem connect speeds can be graphed using SNMP MIBs. The graph shown in Figure 6-2 was created with Cisco Access Manager (CAM). The graph describes the modem connect-speed performance activity of one NAS for one month. The following connect speeds are transmitted by the NAS and received by the client modem. Most of the calls performed between 28000 and 31200 bps. This NAS is one member of an access stack. Figure 6-2 Graphed Modem-Connect Speeds for One Month Cisco AS5x00 Case Study for Basic IP...

V34 Basic Rules

V.34 modulation should work on any land-line voiceband circuit. V.34 supports speeds ranging from 2400 to 33600 bps. The amount of usable spectrum across the channel (for example, 2400 to 3429 Hz) The signal to noise ratio (SNR) To achieve 33600 bps, the channel must deliver A response from 244 to 3674 Hz In practice, toll-quality voiceband circuits support V.34 at speeds of 21600 to 33600 bps. The following six items reduce the achieved V.34 speed 1. Robbed-bit signaling links in the circuit,...

V90 Basic Rules

Many circuit components work together to deliver V.90 modulation. See Figure 4-4. Figure 4-4 V.90 Network Components Select recommended modem code. The following are reliable V.90 releases at the time of this publication - MICA portware version 2.6.2.0 - Microcom firmware version 5.2.1.0 The latest modem code is posted on CCO at the following URL. You must be a registered CCO user to view the link Run a Cisco IOS release that is compatible with V.90. Table 4-3 shows the V.90 supported Cisco IOS...

Task 5 Confirming the Final Running Config

After completing the tasks in this section, the Cisco AS5300's final running configuration looks like this Last configuration change at 05 59 00 UTC Mon Nov 1 1999 by admin NVRAM config last updated at 05 59 02 UTC Mon Nov 1 1999 by admin service timestamps debug datetime msec localtime show-timezone service timestamps log datetime msec localtime show-timezone service password-encryption logging buffered 10000 debugging no logging console aaa new-model aaa authentication login default local aaa...

Cisco AS5300 Configuration

Cisco AS5x00 Case Study for Basic IP Modem Services j username admin password 7 045802150C2E username dude password 7 070C285F4D06 spe 1 0 1 7 firmware location bootflash mica-modem-pw.2.7.1.0.bin spe 2 0 2 7 firmware location bootflash mica-modem-pw.2.7.1.0.bin ip subnet-zero no ip source-route ip host dirt 172.22.100.9 ip domain-name mauionions.com ip name-server 172.22.11.10 ip name-server 172.22.12.11 async-bootp dns-server 172.30.10.1 172.30.10.2 isdn switch-type primary-5ess mta receive...

Upgrading Modem Firmware

Cisco regularly enhances modem DSP code to improve modem performance. To obtain the latest DSP code, upgrade the NAS modem firmware. Figure 6-1 summarizes the firmware upgrade procedure. Figure 6-1 Modem Firmware Download Operation Example Figure 6-1 Modem Firmware Download Operation Example Mica-modem-pw.x.x.x.x. (portware file) Mica-modem-pw.x.x.x.x. (portware file) Download the portware from CCO to a TFTP server or directly into the NAS. Step 1 Read the latest modem release notes about modem...

Configuration Design Parameters

Before the equipment is deployed at the customer sites, both companies define the following configuration design parameters IP subnetting and address strategy Note This case study uses private RFC 1918 IP addresses. For more information, refer to the following URL Note This case study uses private RFC 1918 IP addresses. For more information, refer to the following URL Table 1-5 through Table 1-7 describe the IP subnetting plan, device parameters, and dial plan. The headquarters portion of the...

Using the Cisco Ios Exec Cli

The Cisco IOS command line interface (CLI) contains many modem management show commands. Use these commands to gather and view modem statistics. This section provides a bulleted list detailing some of the most useful commands. Here is a list of the show modem command options < 0-2> at-mode call-stats configuration connect-speeds cookie csm group log operational-status summary test version Display a summary of the modem call statistics Incoming calls Outgoing calls Busied Failed No Succ...

Task 2 Initiating and Inspecting a V90 Test Call

Before you let users dial in to the NAS, initiate and inspect a V.90 test call. V.90 call performance is heavily dependent upon the telco's network topology. There are many variables. Most modem manufactures have unique AT command sets. The AT commands used in the following procedure might not be supported by your modem. For more information, see the following URLs Step 1 Locate a client PC, client modem, and an analog line. The following figure shows the network environment for this test. Step...

Matching the Cisco IOS Images

The dial shelf and router shelf run separate Cisco IOS images Both images must be from the same Cisco IOS Release. They must match. The router shelf's image is in the Cisco 7206's Flash memory. It begins with c5800. The dial shelf's image is in the DSC card. It begins with dsc. On the router shelf, check the Cisco IOS image, uptime, and restart reason Cisco Internetwork Operating System Software IOS (tm) 5800 Software (C5800-P4-M), Version 12.0(4)XL1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)...

Task 4 Configuring the Serial Interfaces

Configure the serial D channels to route incoming voice calls from the PSTN to the integrated modems. The behavior of the B channels is controlled by the D channels' configuration instructions. The D channel is the signaling channel. After timeslots are assigned by the pri-group command, D-channel serial interfaces are automatically created in the configuration file (for example S0 23, S1 23, and so on). Individual B-channel serial interfaces are created as rotary members of their signaling D...

Task 1 Initiating a Modem Loopback Test Call

Test the access server's ability to initiate and terminate a modem call. Similar to sending a ping to the next-hop router, this test verifies basic connectivity for modem operations. Successfully performing this test gives you a strong indication that remote clients should be able to dial into the NAS. Figure 4-6 shows this test. After completing this test, dial into the EXEC from a client PC and a client modem (no PPP). Figure 4-6 Initiating and Terminating a Modem Call on the Same NAS Note...

Modem Autoconfigure K56Flex Example

The following modem-autoconfigure string disables V.8bis K56Flex. The string & F& D2s53 0 is applied to two MICA modems. Disabling V.8bis reduces trainup time by about two seconds, and it prevents trainup problems with older client modems. Step 1 Watch the modem autoconfigure function run, so you can see if there are any typos in the modem string Modem Configuration Database debugging is on 53 0 0-NAS show debug Modem Autoconfig Modem Configuration Database debugging is on 53 0 0-NAS...

Task 3 Enabling the T3T1 Controllers

Configure the settings for the T3 T1 controllers. They must match the telco's settings on the telephone switch. Mismatched settings cause problems sometimes these problems are not detected for a long time. Figure 3-4 shows that a T3 trunk card requires T1 and T3 controller configuration settings. Figure 3-4 Matching Controller Settings controller T3 1 0 0 framing m23 t1 4 controller Step 2 Configure the controller T3. There are 28 T1 controllers in one T3. In this example, only the fourth...