DHCPv6-relay multicast operations
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A DHCPv6-relay message sent to any multicast address carries a hop limit of 32. The hop limit for DHCPv6 requests sent to a unicast address is determined by the
ipv6 hop-limit 1 - 255
command at the global configuration level; Default: 64. -
Multicast addresses reserved for DHCPv6 include the following:
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FF02::1:2—All_DHCP_Relay_Agents_and_Servers
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FF05::1:3—All_DHCP_Servers
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DHCPv6 client and relay functions are mutually exclusive on a VLAN. Attempting to configure one of these functions on a VLAN while the other is already configured results in one of the following messages:
Cannot configure an IPv6 helper-address as DHCPv6 client is enabled on the VLAN
Cannot enable DHCPv6 client as an IPv6 helper-address is configured on the VLAN.
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The routing switch supports concurrent, independent operation of DHCPv4 and DHCPv6.