1076 BigIron RX Series Configuration Guide53-1001986-01Configuring IPv6 neighbor discovery43For example, to adjust the interval to 1000 milliseconds and the number of tokens to 100 tokens,enter the following command.BigIron RX(config)# ipv6 icmp error-interval 1000 100Syntax: ipv6 icmp error-interval <interval> [<number-of-tokens>]The interval in milliseconds at which tokens are placed in the bucket can range from 0 –2147483647. The maximum number of tokens stored in the bucket can range from 1 – 200.NOTEIf you retain the default interval value or explicitly set the value to 100 milliseconds, output from theshow run command does not include the setting of the ipv6 icmp error-interval command becausethe setting is the default.Also, if you configure the interval value to a number that does not evenly divide into 100000 (100milliseconds), the system rounds up the value to a next higher value that does divide evenly into100000. For example, if you specify an interval value of 150, the system rounds up the value to 200.ICMP rate limiting is enabled by default. To disable ICMP rate limiting, set the interval to zero.Disabling or reenabling ICMP redirect messagesYou can disable or re-enable the sending of ICMP redirect messages by a router. By default, arouter can send an ICMP redirect message to a neighboring host to inform it of a better first-hoprouter on a path to a destination. No further configuration is required to enable the sending ofICMP redirect messages. (For more information about how ICMP redirect messages areimplemented for IPv6, refer to “Configuring IPv6 neighbor discovery” on page 1076.)For example, to disable the sending of ICMP redirect messages on Ethernet interface 3/1, enterthe following commands.BigIron RX(config)# interface ethernet 3/1BigIron RX(config-if-e100-3/1)# no ipv6 redirectsSyntax: [no] ipv6 redirectsTo re-enable the sending of ICMP redirect messages on Ethernet interface 3/1, enter the followingcommands.BigIron RX(config)# interface ethernet 3/1BigIron RX(config-if-e100-3/1)# ipv6 redirectsUse the show ipv6 interface <interface> <port-number> command to verify that the sending ofICMP redirect messages is enabled on a particular interface.Configuring IPv6 neighbor discoveryThe neighbor discovery feature for IPv6 uses IPv6 ICMP messages to do the following:• Determine the link-layer address of a neighbor on the same link.• Verify that a neighbor is reachable.• Track neighbor routers.An IPv6 host is required to listen for and recognize the following addresses that identify itself:
