draft-ietf-ntp-dhcpv6-ntp-opt-01.txt   draft-ietf-ntp-dhcpv6-ntp-opt-02.txt 
Network Working Group R. Gayraud Network Working Group R. Gayraud
Internet-Draft B. Lourdelet Internet-Draft B. Lourdelet
Intended status: Standards Track Cisco Systems, Inc. Intended status: Standards Track Cisco Systems, Inc.
Expires: January 5, 2009 July 4, 2008 Expires: January 12, 2009 July 11, 2008
Network Time Protocol (NTP) Server Option for DHCPv6 Network Time Protocol (NTP) Server Option for DHCPv6
draft-ietf-ntp-dhcpv6-ntp-opt-01.txt draft-ietf-ntp-dhcpv6-ntp-opt-02.txt
Status of this Memo Status of this Memo
By submitting this Internet-Draft, each author represents that any By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with Section 6 of BCP 79. aware will be disclosed, in accordance with Section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
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This Internet-Draft will expire on January 5, 2009. This Internet-Draft will expire on January 12, 2009.
Abstract Abstract
The NTP Server Option for DHCPv6 provides NTP (Network Time Protocol The NTP Server Option for DHCPv6 provides NTP (Network Time Protocol
version 4) configuration information to DHCPv6 hosts. version 4) configuration information to DHCPv6 hosts.
Table of Contents Table of Contents
1. Requirements notation . . . . . . . . . . . . . . . . . . . . 3 1. Requirements notation . . . . . . . . . . . . . . . . . . . . 3
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
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3. NTP Server Option for DHCPv6 3. NTP Server Option for DHCPv6
This option serves as a container for all the information related to This option serves as a container for all the information related to
one NTP server. This option can appear multiple times in a DHCPv6 one NTP server. This option can appear multiple times in a DHCPv6
message. Each instance of this option is to be considered by the NTP message. Each instance of this option is to be considered by the NTP
client as a server to include in its configuration. client as a server to include in its configuration.
The option itself does not contain any value. Instead, it contains The option itself does not contain any value. Instead, it contains
one or several suboptions that carry NTP server configuration one or several suboptions that carry NTP server configuration
information. The first suboption in this option MUST be information. This option MUST include one, and only one, time source
NTP_OPTION_SRV_ADDR, NTP_OPTION_SRV_MC_ADDR or NTP_OPTION_SRV_FQDN. suboption. The currently defined time source suboptions are:
It carries the NTP server location, as a unicast or multicast IPv6 NTP_OPTION_SRV_ADDR, NTP_OPTION_SRV_MC_ADDR, NTP_OPTION_SRV_FQDN. It
address or as an NTP server FQDN. While the FQDN option offers the carries the NTP server location, as a unicast or multicast IPv6
most deployment flexibility, resiliency as well as security, the IP address or as an NTP server FQDN. More time source suboptions may be
defined in the future. While the FQDN option offers the most
deployment flexibility, resiliency as well as security, the IP
address options are defined to cover cases where a dependancy to DNS address options are defined to cover cases where a dependancy to DNS
is not desirable. is not desirable.
If the NTP server location is an IPv6 multicast address, the client If the NTP server location is an IPv6 multicast address, the client
SHOULD use this address as an NTP multicast group address and listen SHOULD use this address as an NTP multicast group address and listen
to messages sent to this group in order to synchronize its clock. to messages sent to this group in order to synchronize its clock.
The format of the NTP Server Option is: The format of the NTP Server Option is:
0 1 2 3 0 1 2 3
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