User guide

Nearest-Edge Mode Operation Managing Automatic Remote Configuration Download
page 8-20 OmniSwitch 6250/6450 Switch Management Guide May 2012
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 Transmisson from Management Switch
• The Management Switch is configured to use the Nearest-Edge Mode MAC address using the lldp
destination mac-address command 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 Access Switch
The Automatic Configuration Download feature enables the processing of the Nearest-edge LLDP PDUs
by default.
Nearest-Edge Mode Configuration Example
Management Switch
The Management Switch is connected to the network using an untagged interface and is configured to use
the Nearest-edge Mode MAC address using the lldp destination mac-address command. 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 PDUs are sent on the untagged interface with the
Nearest-edge MAC address and propagated throughout the network eventually reaching the Access
Switch.
For example:
-> vlan 999 name “VLAN 999”
-> vlan 999 port default 1/1
-> lldp destination mac-address nearest-edge
-> lldp 1/1 tlv dot1 vlan-name enable