29Parameterspool-number: Number of the address pool, in the range of 0 to 99.low-ip-address: Start address of the address pool.high-ip-address: End IP address of the address pool. An address pool can contain up to 1024 IPaddresses. If the end IP address is not specified, the address pool has only one IP address, which is thestart IP address.DescriptionUse the ip pool command to configure an address pool for assigning IP addresses to PPP users.Use the undo ip pool command to remove an address pool.By default, no IP address pool is configured for PPP users.IP address pools configured in system view are for PPP users that do not need authentication. To configurean IP address pool for the peer PPP users, use the remote address command in a specified interface view.IP address pools configured in ISP domain view are for PPP users that need authentication in the specifiedISP domain. These IP address pools apply to the interfaces that connect to a larger number of PPP usersthan those the interfaces can assign IP addresses for. However, IP address pools configured in ISPdomains can solve the problem.Related commands: remote addressExamples# Configure IP address pool 0, with the IP addresses ranging from 129.102.0.1 to 129.102.0.10. system-view[Sysname] domain test[Sysname-isp-test] ip pool 0 129.102.0.1 129.102.0.10link-protocolSyntaxlink-protocol { hdlc | ppp }ViewSynchronous serial interface viewDefault level2: System levelParametershdlc: Specifies HDLC as the link layer protocol.ppp: Specifies PPP as the link layer protocol.DescriptionUse the link-protocol command to specify the link protocol of the current interface.The default link layer protocol of a synchronous serial interface is PPP.Examples# Specify PPP as the link layer protocol of Serial 4/1/9/1:0. system-view