Chapter 24
| DHCP Commands
DHCP for IPv6
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Command Mode
Privileged Exec
Command Usage
◆
This command starts the DHCPv6 client process if it is not yet running by
submitting requests for configuration information through the specified
interface(s). When DHCPv6 is restarted, the switch may attempt to acquire an IP
address prefix through stateful address auto-configuration. If the router
advertisements have the “other stateful configuration” flag set, the switch may
also attempt to acquire other non-address configuration information (such as a
default gateway or DNS server) when DHCPv6 is restarted.
Prior to submitting a client request to a DHCPv6 server, the switch should be
configured with a link-local address using the
ipv6 address autoconfig
command. The state of the Managed Address Configuration flag (M flag) and
Other Stateful Configuration flag (O flag) received in Router Advertisement
messages will determine the information this switch should attempt to acquire
from the DHCPv6 server as described below.
■
Both M and O flags are set to 1:
DHCPv6 is used for both address and other configuration settings.
This combination is known as DHCPv6 stateful, in which a DHCPv6 server
assigns stateful addresses to IPv6 hosts.
■
The M flag is set to 0, and the O flag is set to 1:
DHCPv6 is used only for other configuration settings.
Neighboring routers are configured to advertise non-link-local address
prefixes from which IPv6 hosts derive stateless addresses.
This combination is known as DHCPv6 stateless, in which a DHCPv6 server
does not assign stateful addresses to IPv6 hosts, but does assign stateless
configuration settings.
◆
DHCPv6 clients build a list of servers by sending a solicit message and
collecting advertised message replies. These servers are then ranked based on
their advertised preference value. If the client needs to acquire prefixes from
servers, only servers that have advertised prefixes are considered.
◆
If the rapid commit option has been enabled on the switch using the
ipv6 dhcp
client rapid-commit vlan
command, and on the DHCPv6 server, message
exchange can be reduced from the normal four step process to a two-step
exchange of only solicit and reply messages.
Example
The following command submits a client request on VLAN 1.
Console#ipv6 dhcp restart client vlan 1
Console#
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Страница 2: ......
Страница 28: ...Figures 28 ...
Страница 34: ...Section I Getting Started 34 ...
Страница 58: ...Chapter 1 Initial Switch Configuration Setting the System Clock 58 ...
Страница 72: ...Chapter 2 Using the Command Line Interface CLI Command Groups 72 ...
Страница 156: ...Chapter 5 SNMP Commands Notification Log Commands 156 ...
Страница 164: ...Chapter 6 Remote Monitoring Commands 164 ...
Страница 218: ...Chapter 7 Authentication Commands Management IP Filter 218 ...
Страница 268: ...Chapter 8 General Security Measures Port based Traffic Segmentation 268 ...
Страница 292: ...Chapter 9 Access Control Lists ACL Information 292 ...
Страница 312: ...Chapter 10 Interface Commands Power Savings 312 ...
Страница 324: ...Chapter 11 Link Aggregation Commands Trunk Status Display Commands 324 ...
Страница 366: ...Chapter 15 Address Table Commands 366 ...
Страница 428: ...Chapter 17 VLAN Commands Configuring Voice VLANs 428 ...
Страница 572: ...Chapter 25 IP Interface Commands IPv6 Interface 572 ...
Страница 578: ...Section I Appendices 578 ...
Страница 594: ...Appendix C Customer Support Manuals 594 ...