Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 44)

26 Brocade ICX 6650 Layer 3 Routing Configuration Guide
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Configuring IP parameters – Layer 3 Switches
FIGURE 3 DNS resolution with one domain name
Defining a domain name
To define a domain to resolve host names, enter the ip dns domain-name command.
Brocade(config)# ip dns domain-name ds.company.com
Syntax: [no] ip dns domain-name domain-name
Enter the domain name for domain-name.
Defining DNS server addresses
You can configure the Brocade device to recognize up to four DNS servers. 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 DNS address is queried (also up to three times). This process continues for each
defined DNS address until the query is resolved. The order in which the default DNS addresses are
polled is the same as the order in which you enter them.
To define DNS servers, enter the ip dns server-address command.
Brocade(config)# ip dns server-address 192.168.22.199 192.168.7.15 192.168.10.25
192.168.20.15
Syntax: [no] ip dns server-address ip-addr [ip-addr] [ip-addr] [ip-addr]
In this example, the first IP address entered becomes the primary DNS address and all others are
secondary addresses. Because IP address 192.168.20.15 is the last address listed, it is also the
last address consulted to resolve a query.
1. Client sends a
command to ping
"mary"
Domain name
eng.company.com is
configured in the
FastIron switch
DNS Servers with host
names and IP addresses
configured
DNS Server 1
DNS Server 2
DNS Server 3
DNS Server 4
2. FastIron switch sends
"mary.eng.company.com
to DNS servers for resolution.
4. If “mary.eng.company.com”
is in the DNS servers, its IP
address is returned. If it is not
found, a “unknown host”
message is returned.
3. Beginning with DNS Server 1,
DNS Servers are checked
in sequential order to see if
“mary.eng.company.com”
is configured in the server.
This server has
“mary.eng.company.com”