Chapter 29
| DHCP Commands
DHCP Client
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◆ If the rapid commit option has been enabled on the switch with this 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
Console(config)#ipv6 dhcp client rapid-commit vlan 2
Console(config)#
show ipv6 dhcp duid This command shows the DHCP Unique Identifier for this switch.
Command Mode
Privileged Exec
Command Usage
DHCPv6 clients and servers are identified by a DHCP Unique Identifier (DUID)
included in the client identifier and server identifier options. Static or dynamic
address prefixes may be assigned by a DHCPv6 server based on the client’s DUID.
Example
Console#show ipv6 dhcp duid
DHCPv6 Unique Identifier (DUID): 0001-0001-4A8158B4-00E00C0000FD
Console#
show ipv6 dhcp vlan This command shows DHCPv6 information for the specified interface(s).
Syntax
show ipv6 dhcp vlan vlan-list
vlan-list - VLAN ID, specified as a single number, a range of consecutive
numbers separated by a hyphen, or multiple numbers separated by
commas. (Range: 1-4094; Maximum command length: 300 characters)
Command Usage
Each allocation in the DHCPv6 server is identified by a DUID and an IAID. IAID
means Interface Association Identifier, and is a binding between the interface and
one or more IP addresses.
Command Mode
Privileged Exec
Example
Console#show ipv6 dhcp vlan 1
VLAN 1 is in DHCP client mode, Rapid-Commit
IAID: C0000F0
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