H3C S3600 Series Operation Manual

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Contents

H3C S3600 Series Operation Manual Manual pdf 58 page image

Operation Manual – DHCPH3C S3600 Series Ethernet Switches-Release 1510 Chapter 5 DHCP Accounting Configuration5-1Chapter 5 DHCP Accounting Configuration5.1 Introduction to DHCP AccountingDHCP accounting allows a DHCP server to notify the RADIUS server of the start/end ofaccounting when it assigns/releases a lease. The cooperation of DHCP server andRADIUS server implements the network accounting function and ensures networksecurity at the same time.5.1.1 DHCP Accounting FundamentalsAfter you complete AAA and RADIUS configuration on a switch with the DHCP serverfunction enabled, the DHCP server acts as a RADIUS client. For the authenticationprocess of the DHCP server acting as a RADIUS client, refer to the “Introduction toRADIUS” section of the "Security” part in this manual. The following describes only theaccounting interaction between DHCP server and RADIUS server.z After sending a DHCP-ACK packet with the IP configuration parameters to theDHCP client, the DHCP server sends an Accounting START packet to a specifiedRADIUS server. The RADIUS server processes the packet, makes a record, andsends a response to the DHCP server.z Once releasing a lease for some reason, the DHCP server sends an AccountingSTOP packet to the RADIUS server. The RADIUS server processes the packet,stops the recording for the DHCP client, and sends a response to the DHCPserver. A lease can be released for the reasons such as lease expiration, arelease request received from the DHCP client, a manual release operation, anaddress pool removal operation.z If the RADIUS server of the specified domain is unreachable, the DHCP serversends up to three Accounting START packets (including the first sending attempt)at regular intervals. If the three packets bring no response from the RADIUSserver, the DHCP server does not send Accounting START packets any more.5.2 DHCP Accounting Configuration5.2.1 PrerequisitesBefore configuring DHCP accounting, make sure that:z The DHCP server is configured and operates properly. Address pools and leasetime are configured.z DHCP clients are configured and DHCP service is enabled.z The network operates properly.

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