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IPv6 Addressing Configuration
Enabling DHCPv6
1-8
To view all currently configured IPv6 unicast addresses, use the following:
show ipv6 (Lists IPv6 addresses for all VLANs configured on the switch.)
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show ipv6 vlan < vid > (Lists IPv6 addresses configured on the VLAN.)
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For more information, refer to "View the Current IPv6 Addressing Configura-
tion" on page 1-17.
Operating Notes
If multiple DHCPv6 servers are available, the switch selects a server based
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on the preference value sent in DHCPv6 messages from the servers.
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The switch supports both DHCPv4 and DHCPv6 client operation on the
same VLAN.
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DHCPv6 authentication and stateless DHCPv6 are not supported.
With IPv6 enabled, the switch determines the default IPv6 router for the
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VLAN from the router advertisements it receives. (Refer to "Default IPv6
Router" on page 1-24.)
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DHCPv6 and statically configured global unicast addresses are mutually
exclusive on a given VLAN. That is, configuring DHCPv6 on a VLAN erases
any static global unicast addresses previously configured on that VLAN,
and the reverse. (A statically configured link-local address will not be
affected by configuring DHCPv6 on the VLAN.)
For the same subnet on the switch, a DHCPv6 global unicast address
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assignment takes precedence over an autoconfigured address assign-
ment, regardless of which address type was the first to be configured. If
DHCPv6 is subsequently removed from the configuration, then an auto-
configured address assignment will replace it after the next router adver-
tisement is received on the VLAN. DHCPv6 and autoconfigured addresses
co-exist on the same VLAN if they belong to different subnets.
For related information refer to:
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RFC 3315: "Dynamic Host Configuration Protocol for IPv6 (DHCPv6)"
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RFC 3633: "IPv6 Prefix Options for Dynamic Host Configuration Protocol
(DHCP) version 6"
RFC 3736: "Stateless Dynamic Host Configuration Protocol (DHCP)
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Service for IPv6"
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