Brocade BigIron RX Series Configuration Guide - Manual (Page 1255)

BigIron RX Series Configuration Guide 1177
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Configuring IPv6 Domain Name Server (DNS) resolver
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You can specify the <sub-net-mask> parameter in either dotted decimal notation or as a decimal
value preceded by a slash mark (/).
The secondary keyword specifies that the configured address is a secondary IPv4 address.
To remove the IPv4 address from the interface, enter the no form of this command.
Syntax: ipv6 address <ipv6-prefix>/<prefix-length> [eui-64]
This syntax specifies a global or site-local IPv6 address. For information about configuring a
link-local IPv6 address, refer to
“Configuring a link-local IPv6 address” on page 1172.
You must specify the <ipv6-prefix> parameter in hexadecimal using 16-bit values between colons
as documented in RFC 2373.
You must specify the <prefix-length> parameter as a decimal value. A slash mark (/) must follow
the <ipv6-prefix> parameter and precede the <prefix-length> parameter.
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 1170.
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>]