Administrator Guide

The DNS server address does not allow the following:
• link local addresses
• loopback addresses
• prex addresses
• multicast addresses
• invalid host addresses
If you specify this information in the IPv6 RDNSS conguration, a DNS error is displayed.
Example for Conguring an IPv6 Recursive DNS Server
The following example congures a RDNNS server with an IPv6 address of 1000::1 and a lifetime of 1 second.
Displaying IPv6 RDNSS Information
To display IPv6 interface information, including IPv6 RDNSS information, use the show ipv6 interface command in EXEC or EXEC
Privilege mode.
Examples of Displaying IPv6 RDNSS Information
The following example displays IPv6 RDNSS information. The output in the last 3 lines indicates that the IPv6 RDNSS was correctly
congured on interface te 1/1.
To display IPv6 RDNSS information, use the show configuration command in INTERFACE CONFIG mode.
The following example uses the show configuration command to display IPv6 RDNSS information.
Debugging IPv6 RDNSS Information Sent to the Host
To verify that the IPv6 RDNSS information sent to the host is congured correctly, use the debug ipv6 nd command in EXEC Privilege
mode.
Example of Debugging IPv6 RDNSS Information Sent to the Host
The following example debugs IPv6 RDNSS information sent to the host.
The last 3 lines indicate that the IPv6 RDNSS information was congured correctly.
dns-server=1000::0001, lifetime=1 sec
dns-server=3000::0001, lifetime=1 sec
dns-server=2000::0001, lifetime=0 sec
If the DNS server information is not displayed, verify that the IPv6 recursive DNS server conguration was congured on the correct
interface.
IPv6 Multicast
Dell Networking OS supports IPv6 multicast.
The Dell Networking OS supports the following protocols to implement IPv6 multicast routing:
• Multicast listener discovery protocol (MLD) — MLD on a multicast router sends out periodic general MLD queries that the switch
forwards through all ports in the VLAN. There are two versions of MLD: MLD version 1 is based on version 2 of the Internet group
management protocol (IGMP) for IPv4; MLD version 2 is based on version 3 of the IGMP for IPv4. IPv6 multicast for the Dell
Networking OS supports versions 1 and 2.
• Protocol-independent multicast-sparse mode (PIM-SM) — PIM-SM is a multicast protocol in which multicast receivers explicitly join
to receive multicast trac. The protocol uses a router as the root or rendezvous point (RP) of the share tree distribution tree to
IPv6 Routing
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