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This chapter contains all the Privileged EXEC commands used to administer the router. The Cisco 1020 does not have an unprivileged EXEC mode. The commands are presented in alphabetical order.
This Privileged EXEC command provides direct access to the modem attached to the async interface for purposes of configuration or testing.
attach async port| port | Specifies the async port to attach to, either 1 or 2. |
Privileged EXEC
This command is useful for configuring or testing modems or debugging chat scripts.
chat-script
clear interface
modem-def
modem-type
To reset the hardware logic on an interface, use the clear interface privileged EXEC command.
clear interface type number| type | Specifies the interface type; it is one of the keywords listed in Table 2-1. |
| number | Specifies the port. |
| Keyword | Interface Type |
|---|---|
| async | Async interface |
| ethernet | Ethernet interface |
Privileged EXEC
Use clear interface async number after changing its configuration, to have the new configuration take effect.
The following example resets the interface logic on interface async 1:
clear interface async 1
This command erases the configuration information stored in nonvolatile memory.
clear startup-configThis command has no arguments or keywords.
Privileged EXEC
Using this command followed by rebooting the router will erase all configuration information.
write network
configure network
To enter global configuration mode, use the configure privileged EXEC command.
configure [terminal | network]| terminal | Executes configuration commands from the terminal. |
| network | Executes the configuration commands stored in a file on a server. |
terminal
Privileged EXEC
If you do not specify terminal or network, the communication server defaults to terminal. After you enter the configure command, the system prompt changes from cs-name# to cs-name(config)#, indicating that you are in global configuration mode. To leave global configuration mode and return to the privileged EXEC prompt, press Ctrl-Z.
In the following example, the communication server is configured from the terminal:
cs# configure
Enter configuration commands, one per line. End with CNTL/Z.
In the following example, the communication server is configured from the file tokyo-confg at IP address 131.108.2.155:
cs1#configure networkIP address of remote host?131.108.2.155Name of configuration file? tokyo-confg
show configuration
write terminal
To copy a system image from Flash memory to a network server using TFTP, use the copy flash tftp privileged EXEC command.
copy flash tftpThis command has no arguments or keywords.
Privileged EXEC
The copy of the system image can serve as a backup copy and also can be used to verify that the copy in Flash is the same as on the original file on disk.
The following example illustrates how to copy a system image from Flash memory to a network server using TFTP:
Router#copy flash tftpRemote host?jadeName of configuration file to write?cs1020-1.1Requesting tftp of cs1020-1.1 to host jade (192.168.1.70) Sending csOS .................................. Sending msgOSM ........tftp complete
copy tftp flash
To copy a system image into Flash memory using TFTP, use the copy tftp flash privileged EXEC command.
copy tftp flashThis command has no arguments or keywords.
Privileged EXEC
The communication server prompts for the address of the network server and TFTP filename. The entire copying process takes several minutes and will differ from network to network.
 | Caution If you have a bad image in Flash memory and try to boot from Flash, the communication server will attempt to boot from the net using RARP and TFTP. |
Router#copy tftp flashRemote host?jadeName of configuration file to read?cs1020-1.1Requesting tftp of cs1020-1.1 from host jade (192.168.1.70) Initializing File System ! ! CS1020 Operating System Upgrade - Release 1.1 ! Downloading file csOS .................................... 240356 bytes ! ! CS1020 System Messages File ! Downloading file msgOSM ........ 38847 bytes ! ! Predefined Modem initialization strings ! tftp complete
copy flash tftp
Use the debug ip packet privileged EXEC command to display general IP debugging information. The no form of this command disables debugging output.
debug ip packet access-list-number| access-list-number | IP access list number that you can specify. If the datagram is not permitted by that access list, the related debugging output is suppressed. |
Privileged EXEC
If a communication session is closing when it should not be, an end-to-end connection problem can be the cause. The debug ip packet command is useful for analyzing the messages traveling between the local and remote hosts.
IP debugging information includes packets received, generated, and forwarded. ICMP and UDP packets generated on the router are not displayed.
Use the debug ipx packet privileged EXEC command to display information IPX packets received, transmitted, and forwarded. The no form of this command disables debugging output.
debug ipx packet access-list-number| access-list-number | IPX access list number that you can specify. If the datagram is not permitted by that access list, the related debugging output is suppressed. |
Privileged EXEC
This command is useful for learning whether IPX packets are traveling over a router.
To debug PPP, use the debug ppp privileged EXEC command. To turn off the debugging function, use the undebug command.
debug ppp negotiation| negotiation | Debugs the PPP protocol negotiation process. |
Disabled
Privileged EXEC
This command causes the router to dial out to a site specified by the site command as manual dial.
dial site [view]| site | the name of a site specified by the site command as manual. |
| view | show the dial out as it happens, for debugging purposes. |
Privileged EXEC
This command is mostly used for testing new sites before changing them to on-demand or continuous. The site entry must be specified as manual to be used with the dial command.
debug ppp
site
To exit any command mode or close an active terminal session and terminate the privileged EXEC, use the exit command at the system prompt.
exitThis command has no arguments or keywords.
Available in all command modes
When you enter the exit command at the privileged EXEC levels, the privileged EXEC mode is ended. Use the exit command at the configuration level to return to privileged EXEC mode. Use the exit command in interface and site modes to return to global configuration mode. You can also press Ctrl-Z from any configuration mode to return to privileged EXEC mode.
The following example shows how to exit an active session.
Router# exit
logout
To close an active terminal session and terminate the privileged EXEC, enter the logout privileged EXEC command at the system prompt.
logoutThis command has no arguments or keywords.
Privileged EXEC
This command has the same function as the exit privileged EXEC command.
The following example shows how to exit an active session:
logout
exit
To check host reachability and network connectivity, use the ping privileged EXEC command.
ping [address]| address | IP address or hostname of system to ping. |
Privileged EXEC
The ping (packet internet groper) command sends up to three ICMP Echo Request datagrams to verify connectivity.
If the system cannot map an address for a host name, it will return an error message.
To abort a ping session, type ping with no argument.
To reload the operating system, use the reload privileged EXEC command.
reloadThis command has no arguments or keywords.
Privileged EXEC
The reload command reboots the system. The reload command is used after configuration information is entered into a file and saved into NVRAM.
The following example illustrates how to enter the reload command at the privileged EXEC prompt:
Router# reload
write memory
To display the contents of all current access lists, use the show access-lists privileged EXEC command.
show access-lists [access-list-number]| access-list-number | (optional) Access list to display. |
Privileged EXEC
For information on how to configure access lists, refer to the chapter "Configuring IP" of the Access and Communication Servers Configuration Guide.
access-list
Use the show arp privileged EXEC command to display the entries in the ARP table for the router.
show arpThis command has no arguments or keywords.
Privileged EXEC
Use the show hardware privileged EXEC command display the configuration of the system hardware, the software version and the names and sources of configuration files.
show hardwareThis command has no arguments or keywords.
Privileged EXEC
The following is sample output from the show hardware command from a Cisco 1020:
Router #> show hardware
Access Server Software (Cisco 1020), Version 1.1
Compiled Wed 21-Dec-94 23:59
Router uptime is 2 minutes
Cisco 1020 (386SE-25) processor with 1024K bytes of memory.
1 Ethernet/IEEE 802.3 interface
2 async interfaces.
128K bytes of non-volatile configuration memory.
Serial Number 85900001
Table 2-2 describes significant fields shown in the display.
| Field | Description |
|---|---|
| Version 1.1 | Always specify the complete version number when reporting a possible software problem. In the example output, the version number is 1.1. |
| Router uptime is | The amount of time the system has been up and running. |
| Cisco 1020 | The remaining output shows the hardware configuration. |
The output of the show hardware privileged EXEC command can also provide certain messages. If such error messages appear, report the complete text of this message to your technical support specialist.
Use the show hosts privileged EXEC command to display the static list of host names and addresses.
show hostsThis command has no arguments or keywords.
Privileged EXEC
Use the show interfaces privileged EXEC command to display information on interfaces.
show interfaces [interface-type interface-number]| interface-type | Type of interface to be shown. See Table 2-3. |
| interface-number | Port number to be shown. On the Cisco 1020 the port number of the interface can be 0, 1, or 2, depending on the type of interface. See Table 2-3. |
| Keyword | Interface Type | Interface Numbers |
|---|---|---|
| ethernet | Ethernet IEEE 802.3 interface. | 0 |
| async | Asynchronous serial port. | 1, 2 |
Privileged EXEC
interface
Use the show interfaces brief privileged EXEC command to display information on all active interfaces.
show interfaces briefThis command has no arguments or keywords.
Privileged EXEC
The following is sample output from the show interfaces brief command:
Router# show interfaces brief
ether0: flags=1016<IP_UP,IPX_UP,BROADCAST>
inet 192.168.1.1 netmask ffffff00 broadcast 192.168.1.255
ipxnet 000000F3 ipxframe ETHERNET_802.2 mtu 1500
ptp2: flags=10BD<IP_UP,IPX_UP,POINT_TO_POINT,COMPRESS>
dest 192.168.200.1 netmask ffffff00 ipxnet 000000F2 mtu 1500
Table 2-4 describes the fields shown in the display.
| Field | Description |
|---|---|
| IP_UP | The interface is up and running the IP protocol. |
| IP_DOWN | IP is not in use. |
| IPX_UP | The interface is up and running the IPX protocol. |
| IPX_DOWN | IPX is not in use. |
| BROADCAST | The network is a broadcast network (Ethernet). |
| POINT_TO_POINT | The network is a point to point connection (Async). |
| SUSPENDED | This on-demand interface is available for use but does not have an active connection to the remote site. |
| LISTEN | RIP packets can be received but not sent. |
| PRIVATE | No routing information will be received or transmitted. |
| RIPSEND | RIP packets are sent but not received.
If none of the above 3 flags are present, (LISTEN, PRIVATE, RIPSEND) RIP packets can both be sent and received. |
| inet | The IP address of this interface. |
| dest | The destination IP address if it is a point to point connection. |
| netmask | The netmask for "inet" or "dest." |
| broadcast | The broadcast address if this is an ethernet interface. |
| mtu | The maximum transmission unit for the interface. |
| ipxnet | The IPX network number for the interface. |
| ipxframe | The IPX frame type for the interface. |
Use the show ip route privileged EXEC command to display the current state of the routing table.
show ip routeThis command has no arguments or keywords.
Privileged EXEC
The following is sample output from the show ip route command:
Router# show ip route
Destination Netmask Gateway Flag Met Interface
--------------------- --------------- ------------------- ---- --- ---------
0.0.0.0 0.0.0.0 192.168.200.1 NS 1 ptp2
192.168.1.0 255.255.255.0 192.168.1.1 NL 1 ether0
192.168.200.1 255.255.255.0 192.168.200.1 HL 1 ptp2
Table 2-5 describes the fields shown in the display.
| Field | Description |
|---|---|
| Destination | The remote host or network. |
| Netmask | The mask applied to an address when comparing it to this destination. |
| Gateway | The next hop towards the destination. |
| Flag | Locally defined:
"H" - A host route. "N" - A network or subnet route. "S" - A static route. "L" - A route to a directly attached network or host. "D" - A dynamic route, learned via RIP. "C" - A route which has recently changed but not propagated via RIP yet. "O" - An obsolete route scheduled for deletion. |
| Met | The hop count to the destination, from 1 to 15. |
| Interface | Which network interface to use. On-Demand interfaces are numbered starting at ptp3, up to ptp98. |
default routing
ip route
routing rip
To display the contents of the IPX routing table, use the show ipx route privileged EXEC command.
show ipx routeThis command has no arguments or keywords.
Privileged EXEC
The following is sample output from the show ipx route command:
Router# show ipx route
Network Gateway Flag Met Ticks Interface
-------- --------------------- ---- --- ----- ---------
000000F3 000000F3:00000CC05036 NL 1 1 ether0
000000F2 000000F2:00000CC05036 NL 1 1 ptp2
000000F1 000000F2:00000C0A2E9A ND 2 20 ptp2
Table 2-6 describes the fields shown in the display.
| Field | Description |
|---|---|
| Network | Identifies the remote network. |
| Gateway | The next hop towards the destination. |
| Flag | Locally defined:
"N" - A network or subnet route. "S" - A static route. "L" - A route to a directly attached network or host. "D" - A dynamic route, learned via RIP. "C" - A route which has recently changed but not propagated via RIP yet. "O" - An obsolete route scheduled for deletion. |
| Met | The distance metric to the destination, from 1 to 15. |
| Ticks | The distance tick metric to the destination, from 1 to 65535. |
| Interface | Identifies which network interface to use. On-Demand interfaces are numbered starting at ptp3, up to ptp98. |
ipx route
routing rip
To list the IPX servers discovered through SAP advertisements, use the show ipx servers Privileged EXEC command.
show ipx serversThis command has no arguments or keywords.
Privileged EXEC
The following is sample output from the show ipx servers command:
Router# show ipx server
Server Svc Network Host Sock Hops Interface
------------------------ ---- -------------------------- ---- ---------
0800090DF6C383C2NPI0DF6C 30C 000000F3:0800090DF6C3:400C 1 ether0
NOVELL 107 00001701:000000000001:8104 2 ptp2
NOVELL 4 00001701:000000000001:0451 2 ptp2
pr1 5F2 000000F3:00000CC05036:066B 0 Internal
Table 2-7 describes the fields shown in the display.
| Field | Description |
|---|---|
| Server | Name of the server. |
| Svc | Service being advertised. |
| Network | Network the host providing the service is on. |
| Host | Host providing the service. |
| Sock | Socket service is provided on. |
| Hops | Distance Metric to server. |
| Interface | Interface to use to reach server. |
Use the show memory privileged EXEC command to show statistics about the router's memory.
show memoryThis command has no arguments or keywords.
Privileged EXEC
This command displays the initialization information for the specified modem, or the list of known modems if no argument is specified.
show modem [modem]| modem | Short name for the modem as defined by modem-def command. |
Privileged EXEC
modem-def
modem-type
This command displays the settings for the specified site. Passwords are not displayed.
show site site| site | The name of a site defined by the site command. |
Privileged EXEC
show sites
site
This command displays the list of configured sites.
show sitesThis command has no arguments or keywords.
Privileged EXEC
show site
site
Use the show tcp privileged EXEC command to display the status of TCP connections.
show tcpThis command has no arguments or keywords.
Privileged EXEC
Use the show users privileged EXEC command to display information about the active ports of the router. The information displayed includes the line number, connection name, and idle time.
show usersThis command has no arguments or keywords.
Privileged EXEC
Use the show version privileged EXEC command display the configuration of the system hardware, the software version and the names and sources of configuration files.
show versionThis command has no arguments or keywords.
Privileged EXEC
The following is sample output from the show version command from a Cisco 1020:
Router #> show version
Access Server Software (Cisco 1020), Version 1.1
Compiled Wed 21-Dec-94 23:59
Router uptime is 2 minutes
Cisco 1020 (386SE-25) processor with 1024K bytes of memory.
1 Ethernet/IEEE 802.3 interface
2 async interfaces.
128K bytes of non-volatile configuration memory.
Serial Number 85900001
Table 2-8 describes significant fields shown in the display.
| Field | Description |
|---|---|
| Version 1.1 | Always specify the complete version number when reporting a possible software problem. In the example output, the version number is 1.1. |
| Router uptime is | The amount of time the system has been up and running. |
| Cisco 1020 | The remaining output shows the hardware configuration. |
The output of the show version privileged EXEC command can also provide certain messages. If such error messages appear, report the complete text of this message to your technical support specialist.
To display information about the active ports of the router, use the systat privileged EXEC command.
systatThis command takes no arguments or keywords.
Privileged EXEC
This command is a synonym for the show users command.
To start a Telnet connection, enter the telnet privileged EXEC command.
telnet host [port]| host | A host name or an Internet address. |
| port | (Optional) Decimal TCP port number; the default is the Telnet server port (decimal 23) on the host. |
Privileged EXEC
To set the ability to display debug command output and system error messages to the current terminal, use the terminal monitor privileged EXEC command. Use the terminal no monitor command to disable this ability.
terminal monitorThis command has no arguments or keywords.
Disabled
Privileged EXEC
The following example illustrates how to enable the system debugging messages on the local terminal screen:
terminal monitor
Use the trace Privileged EXEC command to discover the IP routes the communication server's packets take when traveling to their destination.
trace [destination]| destination | (Optional) Destination address or host name on the command line. |
Privileged EXEC
The trace command works by taking advantage of the error messages generated by routers when a datagram exceeds its time-to-live (TTL) value.
The trace command starts by sending probe UDP datagrams with a TTL value of one. This causes the first communication server to discard the probe datagram and send back an error message. The trace command sends several probes at each TTL level.
The trace command sends out one probe at a time. Each outgoing packet may result in one or two error messages. A time exceeded error message indicates that an intermediate communication server has seen and discarded the probe. A destination unreachable error message indicates that the destination node has received the probe and discarded it because it could not deliver the packet.
The trace command terminates when the destination responds, when the maximum TTL is exceeded, or when the user interrupts the trace by typing trace with no arguments.
Due to bugs in the IP implementation of various hosts and routers, the IP trace command might behave in odd ways.
Not all destinations will respond correctly to a probe message by sending back an ICMP port unreachable message. A long sequence of TTL levels with only asterisks, terminating only when the maximum TTL has been reached, might indicate this problem.
There is a known problem with the way some hosts handle an ICMP TTL exceeded message. Some hosts generate an ICMP message but they reuse the TTL of the incoming packet. Because this is zero, the ICMP packets do not make it back. When you trace the path to such a host, you might see a set of TTL values with asterisks (*). Eventually the TTL gets high enough that the ICMP message can get back. For example, if the host is six hops away, trace will time out on responses 6 through 11.
To copy the current configuration information to a network server, use the write network privileged EXEC command.
write networkThis command has no arguments or keywords.
Privileged EXEC
This command copies the current configuration to a server host on the network. You are prompted for a destination host and filename.
The following example illustrates how to begin the prompts for writing configuration information to a network host:
Router#write networkRemote host?131.108.1.111Name of configuration file to write? Router-confg Writing Router-confg !! [OK] Router#
To display the current configuration information on the terminal, use the write terminal privileged EXEC command.
write terminalThis command has no arguments or keywords.
Privileged EXEC
The following example illustrates how to display the current configuration information:
write terminal
configure
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