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This chapter describes the function and displays the syntax of SLIP and PPP commands. See the Access Services Command Reference publication for more information about defaults and usage guidelines.
[no] async-bootp tag [:hostname] data
To support the extended BOOTP request specified in RFC 1084, and to specify information that will be sent in response to BOOTP requests, use the async-bootp global configuration command. To clear the list, use the no form of this command.
| tag | Item being requested; expressed as filename, integer, or IP dotted decimal address. See this command in the Access Services Command Reference for supported values. |
| :hostname | (Optional) This entry applies only to the specified host. The argument can be either an IP address or a logical host name. |
| data | List of IP addresses entered in dotted decimal notation or as logical host names, a number, or a quoted string. |
async default ip address
This command is deprecated. It has been replaced with the command peer default ip address. Refer to the description of the peer default ip address command for more information.
To enable the use of IP routing protocols on an asynchronous interfaces when using the /routing switch with the ppp and slip EXEC commands, use the async default routing interface command. To disable this function, use the no form of this command.
To specify dynamic asynchronous addressing, use the async dynamic address interface configuration command. To disable dynamic addressing, use the no form of this command.
To allow the use of routing protocols on an interface, use the async dynamic routing interface configuration command. To disable the use of routing protocols, use the no form of this command.
async mode dedicated
no async mode
To place a line into dedicated asynchronous mode using SLIP or PPP encapsulation, use the async mode dedicated interface configuration command. To return the line to interactive mode, use the no form of this command.
async mode interactive
no async mode
To return a line that has been placed into dedicated asynchronous network mode to interactive mode, thereby enabling the slip and ppp EXEC commands, use the async mode interactive interface configuration command. To prevent users from implementing SLIP and PPP at the EXEC level, use the no form of this command.
To return a line to its idle state, enter the clear line privileged EXEC command at the system prompt.
| line-number | Asynchronous line port number assigned with the interface async command. |
[no] encapsulation {slip | ppp}
To configure SLIP or PPP encapsulation as the default on an asynchronous interface, use the encapsulation interface configuration command. To disable encapsulation, use the no form of this command.
| slip | Specifies SLIP encapsulation for an interface configured for dedicated asynchronous mode or DDR. SLIP is enabled by default. |
| ppp | Specifies PPP encapsulation for an interface configured for dedicated asynchronous mode or DDR. |
hold-queue packets
no hold-queue
To limit the size of the IP output queue, use the hold-queue interface configuration command. To return the output queue to the default size, use the no form of this command.
| packets | Maximum number of packets. The range of values is 0 through 65535. The default is 10 packets for asynchronous interfaces. |
interface type number
no interface
To specify the interface you want to configure, use the interface global configuration command. To clear the interface configuration, use the no form of this command.
| type | Interface type. |
| number | Interface number. See this command in the Access Services Command Reference for a list of interface numbers by access server and router model. |
ip access-group access-list-number {in | out}
no ip access-group access-list-number
To configure an access list to be used for packets transmitted to and from the asynchronous host, use the ip access-group interface configuration command. To disable control over packets transmitted to or from an asynchronous host, use the no form of this command.
| access-list-number | Assigned IP access list number. |
| in | Defines access control on packets transmitted from the asynchronous host. |
| out | Defines access control on packets being sent to the asynchronous host. |
[no] ip address address mask [secondary]
To set IP addresses for an interface, use the ip address interface configuration command. To remove the specified addresses, use the no form of this command.
| address | IP address. |
| mask | Network mask for the associated IP network. |
| secondary | (Optional) Specifies additional IP addresses. |
To specify the size of the largest Internet packet, use the ip mtu interface configuration command. To return to the default MTU size of 1500 bytes, use the no form of this command.
| bytes | Maximum number of bytes. The range of values is 64 to 1000000. The default is 1500 bytes. |
ip tcp header-compression [on | off | passive]
no ip tcp header-compression
To configure Van Jacobson TCP header compression on the asynchronous link, use the ip tcp header-compression line configuration command. To disable header compression, use the no form of this command.
| on | (Optional) Turns header compression on. |
| off | (Optional) Turns header compression off. |
| passive | (Optional) On SLIP lines, prevents transmission of compressed packets until a compressed packet arrives from the asynchronous link, unless a user specifies SLIP on the command line. For PPP, this option functions the same as the on option. |
ip unnumbered type number
no ip unnumbered
To conserve network resources, use the ip unnumbered line configuration command. To disable unnumbered interfaces, use the no form of this command.
| type | Interface type. |
| number | Interface number. |
ipx compression cipx number-of-slots
no ipx compression cipx
To enable compression of IPX packet headers in a PPP session, use the ipx compression cipx interface configuration command. To disable compression of IPX packet headers in a PPP session, use the no form of this command.
| number-of-slots | Number of stored IPX headers allowed. The range is from 10 to 256. The default is 16.
A slot is similar to a table entry for a complete IPX header. When a packet is received, the receiver stores the complete IPX header in a slot and tells the destination which slot it used. As subsequent CIPX packets are sent, the receiver uses the slot number field to determine which complete IPX header to associate with the CIPX packet before passing the packet up to IPX. |
ipx ppp-client loopback number
no vty-async
To enable a non-routing IPX client to connect to an asynchronous interface, the interface must be associated with a loopback interface configured to run IPX. To permit such connections, use the ipx ppp-client interface configuration command. To disable a non-routing IPX client, use the no form of this command.
| loopback | Loopback interface configured with a unique IPX network number. |
| number | Number of the loopback interface. |
To enable the NetBIOS Frames Protocol (NBF) on an interface, use the netbios nbf interface configuration command. To disable NetBIOS Frames Protocol support on an interface, use the no form of this command.
peer default ip address {ip-address | dhcp | pool [poolname]}
no peer default ip address
To specify an IP address, an address from a specific IP address pool, or an address from the DHCP mechanism to be returned to a remote peer connecting to this interface, use the peer default ip address interface configuration command. Use the no form of this command to disable a prior peer IP address pooling configuration on an interface.
To set the address used on the remote (PC) side, use the peer default ip address interface configuration command. To remove the default address from your configuration, use the no form of this command.
| ip-address | Specific IP address to be assigned to a remote peer dialing in to this interface. To prevent the assignment of duplicate IP addresses on two or more interfaces, this form of the command cannot be applied to a dialer rotary group nor to an ISDN interface. |
| dhcp | Retrieve an IP address from the DHCP server. |
| pool | Use the Global Default Mechanism as defined by the ip address-pool command unless the optional poolname is supplied. Pool is the default. |
| poolname | (Optional) Name of a local address pool created using the ip local pool command. Retrieve an address from this pool regardless of the Global Default Mechanism setting. |
[no] ppp accm in | out number
[no] ppp accm match
To improve performance when a peer device's PPP stack cannot negotiate PPP Asynchronous Control Character maps (ACCM), use the ppp accm interface configuration command. Use the no form of the command to turn off this feature.
| in | Uses the value defined in the number variable as the intial seed value to begin LCP negotiations for inbound traffic. |
| out | (Optional) Uses the value defined in the number variable as the initial seed value to begin LCP negotiations for outbound traffic. Can be set through default by using the match form of this command. |
| number | Uses this seed value for in and outbound traffic negotiation. Values are between 0x0 and 0xffffffff. |
| match | (Optional) Uses the value set for inbound traffic (using the in command) for outbound traffic as well. Can be overridden by the out form of this command. |
ppp callback {accept | initiate}
To enable a PPP client to dial into an asynchronous interface and request a callback, use the ppp callback interface configuration command.
| accept | Accept callback requests from RFC1570-compliant PPP clients on the interface. |
| initiate | Initiate a callback to non-RFC1570-compliant PPP clients dialing in an asynchronous interface. |
To provide backward compatibility for client software scripts expecting SLIP and PPP dialogs to be formatted with software release 9.1 or earlier, use the service old-slip-prompts global configuration command. Use the no form of this command to disable this function.
To display the parameters that have been configured for extended BOOTP requests, use the show async bootp privileged EXEC command.
To display the status of activity on all lines configured for asynchronous support, use the show async status privileged EXEC command.
show ipx compression detail int-spec
To show the current status and statistics of IPX header compression during PPP sessions, use the show ipx compression EXEC command.
| detail | Shows detailed link-state database information for NLSP. |
| int-spec | Type of interface to be configured. See the "Interface Type Keywords" table in the "Interface Configuration Commands" chapter of the Configuration Fundamentals Command Reference. |
To display connection status for a line running in asynchronous mode, use the show line privileged EXEC command.
| line-number | (Optional) Particular line about which information will be displayed. If you do not specify a line number, information about all lines is displayed. |
To display NetBIOS name cache contents, use the show nbf cache user level EXEC command.
To view NetBEUI connection information, use the show nbf sessions user level EXEC command .
To configure all virtual terminal lines on an access server or router to support asynchronous protocol features, use the vty-async global configuration command. Use the no form of this command to disable asynchronous protocol features on virtual terminal lines.
vty-async dynamic-routing
no vty-async
To enable dynamic routing on all virtual asynchronous interfaces, use the vty-async dynamic-routing global configuration command. Use the no form of this command to disable asynchronous protocol features on virtual terminal lines and, therefore, disable routing on virtual terminal lines.
vty-async header-compression [passive]
no vty-async
To compress the headers of all TCP packets on virtual asynchronous interfaces, use the vty-async header-compression global configuration command. Use the no form of this command to disable virtual asynchronous interfaces and header compression.
| passive | (Optional) Specifies that outgoing packets to be compressed only if TCP incoming packets on the same virtual asynchronous interface are compressed. For SLIP, if you do not specify this option, the Cisco IOS software will compress all traffic. The default is no compression. For PPP, the Cisco IOS software always negotiates header compression. |
vty-async ipx ppp-client loopback number
no vty-async
To enable IPX-PPP on virtual terminal (VTY) lines, use the vty-async ipx ppp-client loopback global configuration command. Use the no form of this command to disable IPX-PPP sessions on VTYs.
| number | Number of the loopback interface configured for IPX to which the VTY lines are assigned. |
vty-async keepalive seconds
no vty-async
vty-async keepalive 0
To change the frequency of keepalive packets on all virtual asynchronous interfaces, use the vty-async keepalive global configuration command. Use the no vty-async command to disable asynchronous protocol features on virtual terminal lines, or the vty-async keepalive 0 command to disable keepalive packets on virtual terminal lines.
| seconds | The frequency, in seconds, with which the Cisco IOS software sends keepalive messages to the other end of a virtual asynchronous interface. To disable keepalives, use a value of 0. The active keepalive interval is 1 through 32767 seconds. The default is 10 seconds. |
vty-async mtu bytes
no vty-async
To set the maximum transmission unit (MTU) size on virtual asynchronous interfaces, use the vty-async mtu global configuration command. Use the no form of this command to disable asynchronous protocol features on virtual terminal lines.
| bytes | MTU size of IP packets that the virtual asynchronous interface can support. The default MTU is 1500 bytes, the minimum MTU is 64 bytes, and the maximum is 1,000,000 bytes. The default is 1500 bytes. |
no] vty-async ppp authentication {chap | pap}
no vty-async
To enable PPP authentication on virtual asynchronous interfaces, use the vty-async ppp authentication {chap | pap} global configuration command. Use the no vty-async command to globally disable asynchronous protocol features on virtual terminal lines, or the no vty-async ppp authentication {chap | pap} command to disable PPP authentication.
| chap | Enable CHAP on all virtual asynchronous interfaces. |
| pap | Enable PAP on all virtual asynchronous interfaces. |
[no]vty-async ppp use-tacacs
no vty-async
To enable TACACS authentication for PPP on virtual asynchronous interfaces, use the vty-async ppp global configuration command. Use the no form of this command to disable virtual asynchronous interfaces, or the no vty-async use-tacacs command to disable TACACS authentication on virtual asynchronous interfaces.
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