Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 43)

Brocade ICX 6650 Layer 3 Routing Configuration Guide 25
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Configuring IP parameters – Layer 3 Switches
Displaying information for a 31-bit subnet mask
Use the following commands to display information for the 31-bit subnet mask:
• show run interface
• show ip route
• show ip cache
Configuring DNS resolver
The Domain Name System (DNS) resolver is a feature in a Layer 2 or Layer 3 switch that sends and
receives queries to and from the DNS server on behalf of a client.
You can create a list of domain names that can be used to resolve host names. This list can have
more than one domain name. When a client performs a DNS query, all hosts within the domains in
the list can be recognized and queries can be sent to any domain on the list.
After you define a domain name, the Brocade device automatically appends the appropriate
domain to a host and forwards it to the DNS servers for resolution.
For example, if the domain “ds.company.com” is defined on a Layer 2 or Layer 3 switch and you
want to initiate a ping to “mary”, you must reference only the host name instead of the host name
and its domain name. For example, you could enter the following command to initiate the ping.
U:> ping mary
The Layer 2 or Layer 3 switch qualifies the host name by appending a domain name (for example,
mary.ds1.company.com). This qualified name is sent to the DNS server for resolution. If there are
four DNS servers configured, it is sent to the first DNS server. If the host name is not resolved, it is
sent to the second DNS server. If a match is found, a response is sent back to the client with the
host IP address. If no match is found, an “unknown host” message is returned. (Refer to
Figure 3 .)