NTP synchronization is needed for the correct updation of prex age. If the NTP is not congured, then the DHCP prex
delegation will still read the ash, but the prex age may not be correct.
Upgrade and downgrade considerations
• When a router is upgraded to the version of software that supports this feature, the saved information about delegated prexes
will be examined and if the delegated prex lifetime is not expired, then the prex will be added to the IPv6 static route table.
• When a router is downgraded to the version of software that does not support this feature, the saved information about
delegated prexes is retained and it cannot be used.
Conguring DHCPv6 Relay Agent Prex Delegation Notication
To set the number of delegated prexes that can be learned at the global system level, use the ipv6 dhcp-relay maximum-delegated-
prexes command.
By default, the DHCPv6 Relay Agent Prex Delegation Notication is enabled when the DHCPv6 relay agent feature is enabled on an
interface. User can disable the DHCPv6 Relay Agent Prex Delegation Notication at the system or the interface level by setting ipv6
dhcp-relay maximum-delegated-prexes to 0 at the system or interface level as required.
NOTE
Make sure that there is enough free space in the ash memory to save information about delegated prexes in ash on both the
Active and Standby management processor
device(config)# ipv6 dhcp-relay maximum-delegated-prefixes 500
The value parameter is used to limit the maximum number of prexes that can be learned at the global level. The range is from 0 to 512.
The default value is 500.
Syntax: [no] ipv6 dhcp-relay maximum-delegated-prexes value
The value parameter is used to limit the maximum number of prexes that can be learned at the global level. The range is from 0 to 512.
The default value is 500.
Use the no ipv6 dhcp-relay maximum-delegated-prexes command to set the parameter to the default value of the specied platform.
Refer to Enabling DHCPv6 Relay Agent Prex Delegation notication on an interface on page 195 for more information.
NOTE
The DHCPv6 prex delegation default for ICX 7750 is
50.
Enabling DHCPv6 Relay Agent Prex Delegation notication on an interface
To set the number of delegated
prexes that can be learned at the interface level, use the ipv6 dhcp-relay maximum-delegated-prexes
command. This command limits the maximum number of prexes that can be learned on the interface.
device(config-if-eth 1/2/1)# ipv6 dhcp-relay maximum-delegated-prefixes 100
Syntax: [no] ipv6 dhcp-relay maximum-delegated-prexes value
The value parameter is used to limit the maximum number of prexes that can be delegated. The range is from 0 to 512. The default
value is 100. The sum of all the delegated prexes that can be learned at the interface level is limited by the system max.
Use the no ipv6 dhcp-relay maximum-delegated-prexes command to set the parameter to the default value of the specied platform.
DHCPv6 Relay Agent Prex Delegation Notication
FastIron Ethernet Switch Layer 3 Routing
53-1003627-04 195
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