Dell Brocade DCX, Configuration Manual

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1084 BigIron RX Series Configuration Guide
53-1001810-01
Configuring IPv6 neighbor discovery
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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.
NOTE
If you retain the default interval value or explicitly set the value to 100 milliseconds, output from the
show run command does not include the setting of the ipv6 icmp error-interval command because
the setting is the default.
Also, if you configure the interval value to a number that does not evenly divide into 100000 (100
milliseconds), the system rounds up the value to a next higher value that does divide evenly into
100000. 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 messages
You can disable or re-enable the sending of ICMP redirect messages by a router. By default, a
router can send an ICMP redirect message to a neighboring host to inform it of a better first-hop
router on a path to a destination. No further configuration is required to enable the sending of
ICMP redirect messages. (For more information about how ICMP redirect messages are
implemented for IPv6, refer to
“Configuring IPv6 neighbor discovery” on page 1084.)
For example, to disable the sending of ICMP redirect messages on Ethernet interface 3/1, enter
the following commands.
BigIron RX(config)# interface ethernet 3/1
BigIron RX(config-if-e100-3/1)# no ipv6 redirects
Syntax: [no] ipv6 redirects
To re-enable the sending of ICMP redirect messages on Ethernet interface 3/1, enter the following
commands.
BigIron RX(config)# interface ethernet 3/1
BigIron RX(config-if-e100-3/1)# ipv6 redirects
Use the show ipv6 interface < interface > < port-number > command to verify that the sending of
ICMP redirect messages is enabled on a particular interface.
Configuring IPv6 neighbor discovery
The 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:
•
Link-local address.
•
Assigned unicast address.
•
Loopback address.
•
All-nodes multicast address.