Introduction to IPv6

Diagnostic and Troubleshooting

Domain Name System (DNS) Resolution

This feature enables resolving a host name to an IPv6 address and the reverse, and takes on added importance over its IPv4 counterpart due to the extended length of IPv6 addresses. With DNS-compatible commands, CLI command entry becomes easier for reaching a device whose IPv6 address is configured with a host name counterpart on a DNS server.

 

Software release K.13.01 includes the following DNS-compatible commands:

 

■

ping6

 

■

traceroute6

 

The switches covered by this guide now support a prioritized list of up to three

 

DNS server addresses. (Earlier software releases supported only one DNS

 

server address.) Also, the server address list can include both IPv4 and IPv6

 

DNS server addresses. (An IPv6 DNS server can respond to IPv4 queries, and

 

the reverse.)

 

 

N o t e

If an IPv6 DNS server address is configured on the switch, at least one VLAN

 

on the switch (and in the path to the DNS server) must be configured with an

 

IPv6 address.

 

For information on configuring DNS resolution on the switch, refer to “DNS

 

 

Resolver for IPv6” on page 8-9.

IPv6 Neighbor Discovery (ND) Controls

The neighbor discovery feature includes commands for:

■ increasing or decreasing the frequency of Duplicate Address Detection searches

■ displaying the IPv6 neighbor cache

■ clearing dynamic entries from the neighbor cache Refer to “Neighbor Discovery (ND) in IPv6” on page 2-9.

Event Log

Messages returning IP addresses now include IPv6 addresses where appli­ cable.

2-14