User guide

Managing Automatic Remote Configuration Download Nearest-Edge Mode Operation
OmniSwitch AOS Release 7 Switch Management Guide March 2015 page 13-17
Nearest-Edge Mode Operation
In order for the network to propagate Nearest-Edge mode LLDP PDUs a Management Switch must be
configured to send the LLDP PDUs with the Management VLAN information. Additionally, the peer
switches are automatically configured to process the Nearest-Edge Mode LLDP PDU frames by the
Automatic Configuration Download feature.
An OmniSwitch running the Automatic Remote Configuration feature is automatically enabled to process
LLDP PDUs with the unique Nearest-Edge destination MAC address. In Nearest-Edge mode the
Management OmniSwitch uses a unique MAC address when sending LLDP PDUs. The network
OmniSwitch also looks for these unique packets to determine a Management VLAN. It then creates a
DHCP client interface on that tagged VLAN.
LLDP Transmission from Management Switch
• The Management Switch is configured to use the Nearest-Edge Mode MAC address and is connected
to the network using an untagged interface.
• LLDP is configured on the untagged port of the Management Switch so that the LLDP PDUs are sent
with the Management VLAN information.
• The LLDP interval must not be set higher than 30 seconds (default).
• The Management Switch sends LLDP PDUs on the untagged interface with the MAC address of
01:20:DA:02:01:73.
LLDP Propagation through Network
These LLDP PDUs are propagated throughout the network as normal L2 multicast frames, eventually
reaching the Access Switch.
LLDP Reception by Automatic Remote Configuration Switch
The Automatic Remote Configuration feature enables the processing of the Nearest-edge LLDP PDUs by
default.
Nearest-Edge Mode Configuration Example
LLDP Nearest Edge Configuration
Automatic Remote Configuration feature requires learning Management VLAN ID from a centralized
management switch. This VLAN ID information is distributed through LLDP message.
On the management switch, LLDP sends Port VLAN ID TLV to a special MAC address (01:20: DA:
02:01:73). The CLI command for this functionality is as follows:
-> lldp nearest-edge mode {enable | disable}
This functionality also depends on the nearest bridge agent LLDPDU transmit mode. So LLDP sends a
Port VLAN ID TLV when both of the below commands are executed:
-> lldp nearest-bridge chassis lldpdu tx-and-rx
-> lldp nearest-edge mode enable
The LLDPDUs are sent on the untagged interface with the Nearest-edge MAC address and propagated
throughout the network eventually reaching the switch.