Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) - Manual (Page 72)

58 Brocade Virtual ADX Switch and Router Guide
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Configuring IP parameters
4
FIGURE 13 DNS resolution with host name in DNS Cache Table
However, if “mary.eng.company.com” is not in the DNS cache table, as in Figure 14 , the host name
is resolved as follows.
1. A command to ping “mary” is entered at the client.
2. The Brocade device appends the first domain name to “mary” and sends the qualified host
name “mary.facilities.company.com” to the DNS Cache table.
3. The DNS cache table does not have a “mary.facilities.company.com” entry, so it sends the host
name to the DNS servers. Each DNS server is tried in sequential order.
4. Since none of the DNS servers have an entry to “mary.facilities.company.com”, the request is
sent back to the Domain Name List. The next domain name is appended to “mary”.
step 2 through step 4 are repeated until all the domains in the domain name list are tried. In
Figure 14 , “mary.eng.company.com” is found in DNS Server 4.
5. Since a match is found, the host name “mary.eng.company.com” and its IP address is added to
the DNS cache table.
6. The host’s IP address is returned to the client. However, if no match is found, an “unknown
host” message is returned to the client.