Users Guide

The DHCP relay agent inserts Option 82 before forwarding DHCP packets to the DHCP server. The DHCP server includes Option 82 back
in its response to the relay agent. The relay agent uses this information to forward a reply out the interface on which the request was
received rather than flooding it on the entire VLAN. However, the relay agent removes Option 82 from its DHCP responses before
forwarding the responses to the client.
NOTE: Option 82 is supported, but not configurable.
View DHCP Information
Use the show ip dhcp binding command to view the DHCP binding table entries.
OS10# show ip dhcp binding
IP Address Hardware address Lease expiration Hostname
+--------------------------------------------------------------------------
11.1.1.254 00:00:12:12:12:12 Jan 27 2016 06:23:45
Total Number of Entries in the Table = 1
System domain name and list
If you enter a partial domain, the system searches different domains to finish or fully qualify that partial domain. A fully qualified domain
name (FQDN) is any name that terminates with a period or dot.
OS10 searches the host table first to resolve the partial domain. The host table contains both statically configured and dynamically learned
host and IP addresses. If OS10 cannot resolve the domain, it tries the domain name assigned to the local system. If that does not resolve
the partial domain, the system searches the list of domains configured.
You can configure the ip domain-list command up to five times to enter a list of possible domain names. The system searches the
domain names in the order they were configured until a match is found or the list is exhausted.
1. Enter a domain name in CONFIGURATION mode with a maximum of 64 alphanumeric characters.
ip domain-name name
2. Add names to complete unqualified host names in CONFIGURATION mode.
ip domain-list name
You can configure a domain name and list corresponding to a non-default VRF instance.
1. Enter a domain name corresponding to a non-default VRF instance in the CONFIGURATION mode.
ip domain-name vrf vrf-name server-name
2. Add names to complete unqualified host names corresponding to a non-default VRF instance.
ip domain-list vrf vrf-name name
Configure the local system domain name and list
OS10(config)# ip domain-name ntengg.com
OS10(config)# ip domain-list dns1
OS10(config)# ip domain-list dns2
OS10(config)# ip domain-list dns3
OS10(config)# ip domain-list dns4
OS10(config)# ip domain-list dns5
OS10(config)# ip domain-name vrf vrf-blue ntengg.com
OS10(config)# ip domain-list vrf vrf-blue dns1
OS10(config)# ip domain-list vrf vrf-blue dns2
OS10(config)# ip domain-list vrf-vrfblue dns3
OS10(config)# ip domain-list vrf vrf-blue dns4
OS10(config)# ip domain-list vrf vrf-blue dns5
System management
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