User guide

DHCP Client Auto-Configuration Process Managing Automatic Remote Configuration Download
page 12-16 OmniSwitch AOS Release 8 Switch Management Guide May 2014
DHCP Client Auto-Configuration Process
The automatic remote configuration download feature supports the following client configuration meth-
ods to obtain an initial dynamic IP address from the DHCP server:
• Static DHCP client on untagged VLAN 1
• Dynamic DHCP client on tagged VLAN 127
• Dynamic DHCP client on LLDP tagged Management VLAN
• Auto Link Aggregate Detection
OmniSwitch creates a DHCP Client interface on:
• the default untagged VLAN 1 and then on tagged VLAN 127 alternating between each, or
• the Management VLAN being advertised in the LLDP PDUs sent by the Management Switch
configured in Nearest-Edge Mode.
If OmniSwitch receives LLDP PDUs with VLAN and port information from a Management switch in
nearest edge mode, then the DHCP client interface is moved to user defined LLDP management VLAN on
the network. See the “” on page 12-16 for additional information.
The detailed process of DHCP client auto-configuration on an OmniSwitch is as follows:
1 At boot-up, the initial DHCP client starts with untagged VLAN 1.The DHCP client waits for 30
seconds for a DHCP lease.
2 If the lease is not obtained even after 30 seconds, the DHCP client is stopped on the untagged VLAN 1
and DHCP client is started on tagged VLAN 127. The DHCP client on tagged VLAN 127 waits for 30
seconds for a DHCP lease.
3 If the DHCP client does not get the lease in 30 seconds, DHCP client moves back to untagged VLAN 1
and this process continues until it gets the DHCP lease on any one of the two VLANs.
4 If during this process the switch receives an LLDP PDU advertising the management VLAN, the
DHCP process will stop on VLANs 1 and 127 and begin on the management VLAN.
Note.
DHCP client is automatically stopped once a user logs in the switch through console port before getting
the DHCP lease. Once the DHCP client gets the lease, the Remote Config process does not stop even if the
user logs on to the switch through console port.