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This chapter describes the function and displays the syntax for the commands to configure the Point-to-Point Protocol (PPP) for dial-up wide-area networking. For more information about defaults and usage guidelines, see the corresponding chapter of the Dial Solutions Command Reference.
To configure software compression for Point-to-Point Protocol (PPP) encapsulation, use the ppp compress interface configuration command. To disable compression, use the no form of this command.
compress [predictor | stac]| predictor | (Optional) Specifies that a predictor compression algorithm will be used. |
| stac | (Optional) Specifies that a Stacker (LZS) compression algorithm will be used. |
To set the Point-to-Point Protocol (PPP) as the encapsulation method used by a serial or ISDN interface, use the encapsulation ppp interface configuration command.
encapsulation pppTo enable an address pooling mechanism used to supply IP addresses to dial-in asynchronous, synchronous, or ISDN point-to-point interfaces, use the ip address-pool global configuration command. To disable IP address pooling globally on all interfaces with the default configuration, use the no form of the command.
ip address-pool [dhcp-proxy-client | local]| dhcp-proxy-client | (Optional) Uses the router as the proxy-client between a third-party Dynamic Host Configuration Protocol (DHCP) server and peers connecting to the router. |
| local | (Optional) Uses the local address pool named default. |
To specify which Dynamic Host Configuration Protocol (DHCP) servers to use on your network, specify the IP address of one or more DHCP servers available on the network, use the ip dhcp-server global configuration command. Use the no form of the command to remove a DHCP server's IP address.
ip dhcp-server [ip-address | name]| ip-address | (Optional) IP address of a DHCP server. |
| name | (Optional) Name of a DHCP server. |
To configure a local pool of IP addresses to be used when a remote peer connects to a point-to-point interface, use the ip local pool global configuration command. To delete an address pool, use the no form of this command.
ip local pool {default | pool-name low-ip-address [high-ip-address]}| default | Default local address pool that is used if no other pool is named. |
| pool-name | Name of a specific local address pool. |
| low-ip-address | Lowest IP address in the pool. |
| high-ip-address | (Optional) Highest IP address in the pool. If this value is omitted only the low-ip-address IP address is included in the local pool. The maximum number of IP addresses per pool is 256. |
To reserve a special queue for a set of Real-time Transport Protocol (RTP) packet flows belonging to a range of UDP destination ports, use the ip rtp reserve interface configuration command. To disable the special queue for real-time traffic, use the no form of the command.
ip rtp reserve lowest-udp-port range-of-ports [maximum-bandwidth]| lowest-udp-port | Lowest UDP port number to which the packets are sent. |
| range-of-ports | Number, which added to the lowest-UDP-port value, yields the highest UDP port value. |
| maximum-bandwidth | (Optional) Bandwidth, in kilobits per second, reserved for the RTP packets to be sent to the specified UDP ports. |
To specify a virtual template from which the specified Multilink PPP bundle interface can clone its interface parameters, use the multilink virtual-template global configuration command.
multilink virtual-template number| number | Number of the virtual template; an integer in the range 1 through 9. |
Use the peer default ip address interface configuration command 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 no form of the command to disable a prior peer IP address pooling configuration on an interface.
peer default ip address {ip-address | dhcp | pool [pool-name]}| ip-address | Specific IP address to be assigned to a remote peer dialing in to the interface. To prevent duplicate IP addresses from being assigned on more than one interface, this command argument 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 pool-name argument is supplied. This is the default. |
| pool-name | (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. |
To reenable the creation of peer neighbor routes on an interface once this default behavior has been disabled, use the peer neighbor-route interface configuration command. To disable the default behavior of creating a neighbor route for the peer on a point-to-point interface, use the no form of this command.
peer neighbor-routeTo specify the order in which the CHAP or PAP protocols are requested on the interface, use the ppp authentication interface configuration command. Use the no form of the command to disable this authentication.
ppp authentication {chap | chap pap | pap chap | pap} [if-needed] [list-name | default]To enable half-bridging of AppleTalk packets across a serial interface, use the ppp bridge appletalk interface configuration command.
ppp bridge appletalkTo enable half-bridging of IP packets across a serial interface, use the ppp bridge ip interface configuration command.
ppp bridge ipTo enable half-bridging of IPX packets across a serial interface, use the ppp bridge ipx interface configuration command.
ppp bridge ipx [novell-ether | arpa | sap | snap]| novell-ether | Use Novell's Ethernet_802.3 encapsulation. This is the default. |
| arpa | Use Novell's Ethernet_II encapsulation. |
| sap | Use Novell's Ethernet_802.2 encapsulation. |
| snap | Use Novell Ethernet_Snap encapsulation. |
Use the ppp chap hostname interface configuration command to create a pool of dialup routers that all appear to be the same host when authenticating with CHAP. To disable this function, use the no form of the command.
ppp chap hostname hostname| hostname | Name to be sent in the CHAP challenge. |
To configure a common CHAP secret to be used in responses to challenges from an unknown remote peer in a collection of routers that do not support this command (such as routers running older Cisco IOS software images), use the ppp chap password interface configuration command. To disable this function, use the no form of this command.
ppp chap password secret| secret | Secret used to compute the response value for any CHAP challenge from an unknown peer. |
To configure a point-to-point interface not to reset itself immediately after an authentication failure but instead to allow a specified number of authentication retries, use the ppp max-bad-auth interface configuration command. To reset to the default of immediate reset, use the no form of this command.
ppp max-bad-auth number| number | Number of retries after which the interface is to reset itself. Default is 0. |
To enable Multilink PPP on an interface, use the ppp multilink interface configuration command. To disable Multilink PPP, use the no form of this command.
ppp multilinkTo configure a maximum delay allowed for transmission of a packet fragment on a Multilink PPP bundle, use the ppp multilink fragment-delay interface configuration command. To reset the maximum delay to the default value, use the no form of the command.
ppp multilink fragment-delay milliseconds| milliseconds | Maximum delay, in milliseconds, allowed for any packet fragment. Default is 30 milliseconds. |
To enable interleaving of Real-Time Transport Protocol (RTP) packets among the fragments of larger packets on a Multilink PPP bundle, use the ppp multilink interleave interface configuration command. To disable interleaving, use the no form of the command.
ppp multilink interleaveTo enable remote PAP support for an interface and use the sent-username and password elements in the PAP authentication request packet to the peer, use the ppp pap sent-username interface configuration command. Use the no form of this command to disable remote PAP support.
| username | Username sent in the PAP authentication request. |
| password | Password sent in the PAP authentication request. |
| password | Must contain from 1 to 25 uppercase and lowercase alphanumeric characters; cannot contain spaces or underscores. |
To enable Link Quality Monitoring (LQM) on a serial interface, use the ppp quality interface configuration command. Use the no form of this command to disable LQM.
ppp quality percentage| percentage | Specifies the link quality threshold. Range is 1 to 100. |
To enable LAPB Numbered Mode negotiation for a reliable serial link, use the ppp reliable-link interface configuration command. To disable negotiation for a PPP reliable link on a specified interface, use the no form of the command.
ppp reliable-linkTo display the current DHCP settings on point-to-point interfaces, use the show dhcp privileged EXEC command.
show dhcp {server | lease [interface async [number]]}| server | Show known DHCP servers. |
| lease | Show DHCP addresses leased from a server. |
| interface async [number] | (Optional) Specify asynchronous interfaces and, optionally, a specific interface number. |
To display statistics for any defined IP address pools, use the show ip local pool command.
show ip local pool [name]| name | (Optional) Name of a specific IP address pool. |
To display bundle information for the Multilink PPP bundles, use the show ppp multilink EXEC command.
show ppp multilinkTo display information about interleaving, use the show queuing virtual-access EXEC command.
show queuing virtual-access number| number | Virtual access interface number. |
To specify the password to be used in the PPP Challenge Handshake Authentication Protocol (CHAP) caller identification and Password Authentication Protocol (PAP), use the username global configuration command.
username name password secret| name | Host name, server name, user ID, or command name. |
| password | An encrypted password for this username. |
| secret | For CHAP authentication: specifies the secret password for the local router or access server or the remote device. The secret is encrypted when it is stored on the local router or access server. This prevents the secret from being stolen. The secret password can consist of any string of up to 11 printable ASCII characters, but cannot include spaces or underscores. There is no limit to the number of username-password combinations that can be specified, allowing any number of remote devices to be authenticated. |
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