Brocade Communications Systems ICX 7250 series, Configuration Manual

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IPv6 neighbor discovery configuration
The neighbor discovery feature for IPv6 uses IPv6 ICMP messages to do the following tasks:
• 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.
• Solicited-node multicast address.
• Multicast address to all other groups to which it belongs.
You can adjust the following IPv6 neighbor discovery features:
• Neighbor solicitation messages for duplicate address detection.
• Router advertisement messages:
–
Interval between router advertisement messages.
– Value that indicates a router is advertised as a default router (for use by all nodes on a given link).
– Prefixes advertised in router advertisement messages.
– Flags for host stateful autoconfiguration.
• Amount of time during which an IPv6 node considers a remote node reachable (for use by all nodes on a given link).
IPv6 neighbor discovery configuration notes
NOTE
For all solicitation and advertisement messages, Brocade uses seconds as the unit of measure instead of milliseconds.
• If you add a port to a port-based VLAN, and the port has IPv6 neighbor discovery configuration, the system will clean up the
neighbor discovery configuration from the port and display the following message on the console.
ND6 port config on the new member ports removed
• Neighbor discovery is not supported on tunnel interfaces.
Neighbor solicitation and advertisement messages
Neighbor solicitation and advertisement messages enable a node to determine the link-layer address of another node (neighbor) on the
same link. (This function is similar to the function provided by the Address Resolution Protocol [ARP] in IPv4.) For example, node 1 on a
link wants to determine the link-layer address of node 2 on the same link. To do so, node 1, the source node, multicasts a neighbor
solicitation message. The neighbor solicitation message, which has a value of 135 in the Type field of the ICMP packet header, contains
the following information:
• Source address: IPv6 address of node 1 interface that sends the message.
• Destination address: solicited-node multicast address (FF02:0:0:0:0:1:FF00::/104) that corresponds the IPv6 address of node
2.
IPv6 neighbor discovery configuration
Brocade FastIron Layer 3 Routing Configuration Guide
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