Dell Brocade DCX, Configuration Manual

Page: 1151 / 1436

BigIron RX Series Configuration Guide 1079
53-1001810-01
Configuring IPv6 Domain Name Server (DNS) resolver
43
The eui-64 keyword configures the global or site-local address with an EUI-64 interface ID in the
low-order 64 bits. The interface ID is automatically constructed in IEEE EUI-64 format using the
interface’s MAC address. If you do not specify the eui-64 keyword, you must manually configure the
64-bit interface ID as well as the 64-bit network prefix. For more information about manually
configuring an interface ID, refer to
“Configuring a global or site-local IPv6 address” on page 1068.
Configuring IPv6 Domain Name Server (DNS) resolver
The Domain Name Server (DNS) resolver feature lets you use a host name to perform Telnet, ping,
and traceroute commands. You can also define a DNS domain on a
Brocade device and thereby
recognize all hosts within that domain. After you define a domain name, the Brocade device
automatically appends the appropriate domain to the host and forwards it to the domain name
server.
For example, if the domain “newyork.com” is defined on a Brocade device, and you want to initiate
a ping to host “NYC01” on that domain, you need to reference only the host name in the command
instead of the host name and its domain name. For example, you could enter either of the following
commands to initiate the ping.
BigIron RX# ping nyc01
BigIron RX# ping nyc01.newyork.com
Defining a DNS entry
You can define up to four DNS servers for each DNS entry. The first entry serves as the primary
default address. If a query to the primary address fails to be resolved after three attempts, the next
gateway address is queried (also up to three times). This process continues for each defined
gateway address until the query is resolved. The order in which the default gateway addresses are
polled is the same as the order in which you enter them.
Suppose you want to define the domain name of newyork.com on a Brocade device and then
define four possible default DNS gateway addresses. To do so using IPv4 addressing, you would
enter the following commands.
BigIron RX(config)# ip dns domain-name newyork.com
BigIron RX(config)# ip dns server-address 209.157.22.199 205.96.7.15 208.95.7.25
201.98.7.15
Syntax: ip dns server-address < ip-addr > [< ip-addr >] [< ip-addr >] [< ip-addr> ]
In this example, the first IP address in the ip dns server-address... command becomes the primary
gateway address and all others are secondary addresses. Because IP address 201.98.7.15 is the
last address listed, it is also the last address consulted to resolve a query.
Defining an IPv6 DNS entry
IPv6 defines new DNS record types to resolve queries for domain names to IPv6 addresses, as well
as IPv6 addresses to domain names.
Brocade devices running IPv6 software support AAAA DNS
records, which are defined in RFC 1886.
AAAA DNS records are analogous to the A DNS records used with IPv4. They store a complete IPv6
address in each record. AAAA records have a type value of 28.