Foundry Configuration Guide for the FESX, FSX, and FWSX
16 - 52 © Foundry Networks, Inc. December 2005
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 Layer 2 Switch and then define four possible
default DNS gateway addresses. To do so, enter the following commands:
FESX424 Switch(config)# ip dns domain-name newyork.com
FESX424 Switch(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.
Using a DNS Name To Initiate a Trace Route
EXAMPLE:
Suppose you want to trace the route from a Foundry Layer 2 Switch to a remote server identified as NYC02 on
domain newyork.com. Because the newyork.com domain is already defined on the Layer 2 Switch, you need to
enter only the host name, NYC02, as noted below.
FESX424 Switch# traceroute nyc02
Syntax: traceroute <host-ip-addr> [maxttl <value>] [minttl <value>] [numeric] [timeout <value>]
[source-ip <ip addr>]
The only required parameter is the IP address of the host at the other end of the route. See the Foundry Switch
and Router Command Line Interface Reference for information about the parameters.
After you enter the command, a message indicating that the DNS query is in process and the current gateway
address (IP address of the domain name server) being queried appear on the screen:
NOTE: In the above example, 209.157.22.199 is the IP address of the domain name server (default DNS
gateway address), and 209.157.22.80 represents the IP address of the NYC02 host.
Type Control-c to abort
Sending DNS Query to 209.157.22.199
Tracing Route to IP node 209.157.22.80
To ABORT Trace Route, Please use stop-traceroute command.
Traced route to target IP node 209.157.22.80:
IP Address Round Trip Time1 Round Trip Time2
207.95.6.30 93 msec 121 msec
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