Cisco Cable Troubleshooter (CCT) 1.0 is a GUI-based application that can manage a hybrid fiber coaxial (HFC) network and can diagnose problems with the HFC. This tool enables RF technicians to quickly isolate plant and provisioning problems and to characterize upstream and downstream trouble patterns. CCT is a standalone application that runs on both PCs and Solaris workstations and has the following features:
Displays both online and flapping or intermittent DOCSIS modems, including set-top boxes, in tabular format with sortable data columns
For each Cisco uBR7200 series router, the application analyzes and sorts the flapping modem list into four problem categories:
Provisioning problems
Reverse path noise problems
Reverse path attenuation problems
Packet corruption problems and CRC errors
Provides summary statistics for each upstream port:
Total modems online
Percentage of modems online
Minimum and maximum power levels received by the Cisco uBR7200 series router
On-demand queries of subscriber information stored in an LDAP directory
Note Before installing CCT, be sure to check the Readme file for additional information.
Line password in the line configuration set to enable Telnet as follows:
Router(config)# line vty 0 4
Router(config)# password <password>
Session timeout configured for all vty lines (because Telnet is used to communicate with the router) as follows:
Router(config)# line vty 0 4
Router(config-line)# session-timeout 10
Note SNMP is used to read the Cisco IOS release, router name, and type. Cable modem device information is retrieved using the command-line interface (CLI) commands over Telnet sessions to the Cisco uBR7200 series router.
The first step in using CCT is to set up user access. As the primary user, log in as admin with the default password, changeme. After logging in, change the password by choosing Task>User List. This username and password are the root-level Admin user that can add additional users and perform full device management.
For additional users, click Task>UserList to create a list that contains all the valid end users that can access the CCT application and view data.
Specify the following user data:
Username
Password
User Type (Admin or User)
An Admin user can perform the following tasks:
Add/delete users who can access CCT
View and change the SNMP (READ) community string
View and change CLI passwords that CCT uses for accessing the Cisco uBR7200 series routers
Add/remove Cisco uBR7200 series routers from the uBR list
Change the parameters CCT uses for accessing the LDAP server
Run and view the flap list analysis
Save and load data
Users who are not Admin users can perform the same tasks for displaying and analyzing data, but cannot add/delete routers, perform user administration, or modify application settings.
As the Admin user, add/delete the desired Cisco uBR7200 series routers to be managed. Only Admin users can add or delete routers and unmask the passwords.
Note For successful management of these routers, make sure the correct router passwords are entered and SNMP is enabled on these routers. For routers authenticated by AAA servers, click the User Name and User Password column for more information.
To create a router list, choose Task>UBR List and specify the following router data:
IP address
SNMP community strings - Enter the SNMP read community string configured on the router in the Community String (Read) column. The default value is public. Verify that access lists, if configured in the router, allow for SNMP Read access from your workstation.
Router name---The Router Name column reflects the DNS name of the router. If the DNS name is not available, its IP address will be displayed. The Router Name is queried from the router using SNMP. Users cannot edit this column.
Username---Enter a value in the User Name column only when user authentication is configured on the vty lines of the router. If login local is the authentication method on the router's vty lines, then you can find the username by using the router's show config command. For AAA server authentication, enter your TACACS account name.
User Password---In the User Password column, enter a value only when user authentication is configured on the vty lines of the router. The value to enter is the password expected for the given username. For AAA server authentication, enter your TACACS password.
Line Password---In the Line Password column, enter a value only when the router has a password configured on its vty lines. This is the case when both login and a password are found in the router configuration file under an entry such as line vty 0 4. Routers with no line passwords cannot be managed by CCT.
Enable Password---In the Enable Password column, enter the password required to enable the router for configuration changes. This can be configured on the router as either enable password <password> or enable secret <password>. Routers with no enable passwords cannot be managed by CCT.
Cisco IOS Release---The IOS Version column indicates the Cisco IOS software image that is running on the router. The Cisco IOS release is queried from the router using SNMP. Users cannot edit this column.
Router Type---The Router Type column indicates the model of the Cisco uBR7200 series router. The values for this column are discovered by the Flap List Analyzer when the Admin user adds the router to the list, provided the router is reachable at that point. The Router Type is queried from the router using SNMP. Users cannot edit this column.
Note Only Admin users can add routers and unmask the router passwords.
An optional feature of CCT is the ability to link cable modem device information with subscriber information stored in an LDAP directory. To make this possible, the Admin user needs to configure access to LDAP using the LDAP configuration screen from the Task pull-down menu. See "Displaying LDAP Information".
The Flap List Analysis screen shows the output of the following data for modems with a total online time of more than 60 seconds:
Upstream global analysis
Problem categories for flapping modems
Note If the Cisco IOS release of the Cisco uBR7200 series router has changed, go to the UBR List screen and click Apply to obtain the updated Cisco IOS release information before displaying this screen.If a cable modem appears in the flap-list (output of the show cable flap-list command), but does not appear in the active cable modem list (output of the show cable modem command), it will get filtered out from the flap list analysis calculation.
The top of the screen shows the details for the selected Cisco uBR7200 series router.
Note Double-click a field to enter or modify values. Select a row by clicking once on the row number. To sort table information, click the column heading you want to use for sorting. Modem online time is rounded up to the next hour for the flap rate calculations.
This is a global summary report for each upstream port for each line card in the selected Cisco uBR7200 series router. The following data is displayed for each upstream port:
Cable interface identifier
Upstream port identifier
Minimum receive power computed over all cable modems reported in the output of the show cable modem command for the upstream port
Maximum receive power computed over all cable modems reported in the output of the show cable modem command for the upstream port
Percentage of modems reported as online for the upstream port
Number of modems reported as online for the upstream port
Total number of modems reported for the upstream port
If the upstream has a minimum receive power lower than -2 db or a maximum receive power higher than 2 db, the power level is highlighted and indicates a problem with the cable plant.
CCT displays flapping modems in the following four categories to facilitate problem diagnosis and resolution:
Note The categories are not exclusive, so one modem can appear in multiple lists.
Provisioning Problems---Total number of modems that have a provisioning problem along with detailed data for each modem.
Reverse Path Noise Problems---Total number of modems with a reverse path noise problem category along with the following detailed data for each modem:
Cable interface identifier
Upstream port identifier
MAC address
Noise flaps per hour (ratio of the total flaps reported for the modem with respect to the total modem online time in hours)
Note For calculating the noise flaps per hour, if the flap list is cleared, if any of the flap list counters are cleared by the router administrator, or if the modem goes out of the flap list (via aging) and back in again, the modem's flap rate calculation might not be accurate.
Reverse Path Attenuation Problems---Total number of modems with reverse path attenuation problems along with the following detailed data for each modem:
Cable interface identifier
Upstream port identifier
MAC address
Power flaps per hour (ratio of the total number of power adjustments reported for the modem with respect to the total modem online time in hours)
Note For calculating the power flaps per hour, if the flap list is cleared, if any of the flap list counters are cleared by the router administrator, or if the modem goes out of the flap list (via aging) and back in again, the modem's flap rate calculation might not be accurate.
Path CRC Problems---Total number of modems with packet corruption or CRC error problems along with the following detailed data for each modem:
Cable interface identifier
Upstream port identifier
MAC address
Packet corruption count (number of CRC errors detected for the modem)
The display in the Problem tables is limited to 1000 modems at a time. Click the Prev Page/Next Page buttons to display additional sets of 1000 modems.
Click on a modem's MAC address and click Display LDAP Info to display all the information associated with a particular modem that has been previously entered into the provisioning database. If the modem is found in the provisioning database, all the attributes set up for the modem will be displayed in a separate window.
Note Prior to accessing the provisioning database, the LDAP server information has to be configured via the LDAP Access screen from the Task menu. See "Displaying LDAP Information".
Click Capture and Analyze Flap List to perform a new capture of the flap list and modem data and to analyze the new data.
Click Save to save the current set of captured data from the selected Cisco uBR7200 series router. The save operation generates two files: flaplist.ip address of router and analysis.ip address of router.
Note Data displayed using the Load operation (data already saved) is not allowed to be saved again. Click Load to view the previously saved data.
Flap list detailed information mirrors the data available from the following Cisco IOS commands:
show cable modems
show cable flap-list
Note If the Cisco IOS release of the Cisco uBR7200 series router has changed, go to the UBR List screen and click Apply to obtain the updated Cisco IOS release information before displaying the Flap List Details screen.
The Flap List Details screen shows the raw output captured from the selected Cisco uBR7200 series router. Use this data for a visual check on the various operating parameters, state, and flap counters reported by the router for each cable modem.
Capture Time---Time the data was captured from the router.
Router Information:
IP address
Router name
Router type
Cisco IOS release running on the router
Output of show cable modem---Includes the total number of modems reported from the router followed by the actual output from the router in a tabular format. For each cable modem, the router reports the following data:
Primary SID
Modem state
Timing offset
Receive power
QoS
Number of CPEs (reported only for Cisco IOS Release 12.0 and higher)
IP address
MAC address
Output of show cable flap-list---Total number of modems reported from the router followed by the actual output from the router in a tabular format. For each cable modem, the router reports the following data:
MAC address
Cable interface/upstream port
Number of insertion failures
Number of station maintenance hits
Number of station maintenance misses
Number of CRC errors
Number of power adjustments
Total number of flaps
Time stamp for the last flap
The display in the two tables is limited to 1000 modems at a time. Click the Prev Page/Next Page buttons to display the previous/next set of 1000 modems.
Use Find MAC Addr: to quickly search for a particular modem. Enter the MAC address and press Return. If the modem is found, the entire row in the table corresponding to the modem will be highlighted.
Note The MAC address format "xxxx.xxxx.xxxx" must be used, as displayed in the "MAC address" cells in the tables; do not use the format "xx:xx:xx:xx:xx:xx" when specifying the MAC address to be found.
The LDAP server typically contains subscriber-specific information that is used when provisioning cable modems. CCT links its collected device information with the subscriber information using the LDAP interface.
You need to specify the LDAP Access parameters in the LDAP Access Information screen before displaying LDAP information. Click Task>LDAPAccess and enter the following data:
LDAP Server Name---Enter the LDAP server name you want CCT to use for retrieving LDAP information.
LDAP Server Port Number---Enter the LDAP server port number of the LDAP server.
LDAP Parent Name---Enter the LDAP parent name. For example: o=xxx.com
LDAP User Name---Enter an LDAP username. This field is optional if the LDAP server supports the anonymous user. For example: uid=admin, ou=Administrators, ou=TopologyManagement, o=NetscapeRoot
LDAP User Password---Enter the LDAP user password. This field is optional if the LDAP server supports the anonymous user.
Click Apply to validate the LDAP parameters by attempting a connection to the LDAP server using the supplied LDAP parameters. If the parameters are valid, the parameters are saved.
To display LDAP information, go to the Flap List Analysis screen and click Display LDAP Information. The "LDAP Information" window displays all LDAP information using the settings from the LDAP Access Information screen.
Note If the LDAP information is stored under two nodes under the same LDAP parent, (for example: "ou=leases, o=xxx.com" and "ou=modems, o=xxx.com"), the attributes/values from the two nodes are combined and displayed in this window.
CCT allows you to save the current data to time-stamped files so the data can be accessed and analyzed. Click Load Analysis to save the current data to a file in the installed directory as tab-delimited ASCII files. Files are flaplist.ip address of router and analysis.ip address of router.
This file contains the raw output from the execution of the three Cisco IOS commands used for the flap list analysis. Every time you click Save, the appropriate file for the selected Cisco uBR7200 series router is appended with the following sections of information:
Time stamp of the capture
Cisco IOS release
Output from show cable modem
Output from show cable flap-list
For each cable interface/uBR linecard, the output from show interface cable interface sid connectivity. The subsections for each cable interface are delimited by the "~" character.
All of the above sections are delimited by the "^" character.
This file contains the output from the flap-list analysis report. Every time you click Save, the analysis.ip address of router file for the selected Cisco uBR7200 series router is appended with the following sections of information:
Time stamp of the capture
Global Upstream Analysis details
Provisioning Problem Bucket details
Reverse Path Noise Problem Bucket details
Reverse Path Attenuation Problem Bucket details
Packet Corruption (CRC) Problem Bucket details
Each one of the upstream analysis and problem category detail sections is preceded by "{" and followed by "}." The various sections are delimited by a new line.
Note This file is not used by CCT for the restoration of the flap list analysis reports. This file is for reference only.
To print data displayed on the current screen, select Task>Print, specify the desired print settings, and click OK.
The data is formatted as a postscript (.ps) file for screen display.
Note To print all the data used for a flap list analysis report, click Load Analysis to save the data to the data files flaplist.ip address of router and analysis.ip address of router, and then print the desired file.
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