IP Configuration
Domain Name System
340 Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
16
STEP 7 Click Apply. The DNS server is saved to the Running Configuration file.
Search List
The search list can contain one static entry defined by the user in the DNS Settings page and
dynamic entries received from DHCPv4 and DHCPv6 servers.
To view the domain names that have been configured on the device, click IP Configuration >
DNS > Search List.
The following fields are displayed for each DNS server configured on the device.
• Domain Name—Name of domain that can be used on the device.
• Source—Source of the server’s IP address (static or DHCPv4 or DHCPv6) for this
domain.
• Interface—Interface of the server’s IP address for this domain.
• Preference—This is the order in which the domains are used (from low to high). This
effectively determines the order in which unqualified names are completed during
DNS queries.
Host Mapping
Host name/IP address mappings are stored in the Host Mapping Table (DNS cache).
This cache can contain the following type of entries:
• Static Entries—These are mapping pairs that manually added to the cache. There can
be up to 64 static entries.
• Dynamic Entries—These are mapping pairs that either added by the system as a
result of being used by the user, or and an entry for each IP address configured on the
device by DHCP. There can be 256 dynamic entries.
Name resolution always begins by checking static entries, continues by checking the dynamic
entries, and ends by sending requests to the external DNS server.
Eight IP addresses are supported per DNS server per host name.
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