33
Table of Contents
Linksys
33
Table of Contents
Linksys
• If LLDP is globally disabled, the device can be configured to discard,
VLAN-aware flooding, or VLAN-unaware flooding of all incoming
LLDP packets. VLAN-aware flooding floods an incoming LLDP packet
to the VLAN where the packet is received excluding the ingress
port. VLAN-unaware flooding floods an incoming LLDP packet to
all the ports excluding the ingress port. The default is to discard
LLDP packets when LLDP is globally disabled. You can configure the
discard/flooding of incoming LLDP packets from the LLDP Feature
Configuration page.
• LLDP end devices, such as IP phones, learn the voice VLAN
configuration from LLDP advertisements. By default, the device is
enabled to send out LLDP advertisement based on the voice VLAN
configured at the device. Refer to the Voice VLAN for details.
NOTE:
When yLLDP does not distinguish if a port is in a LAG. If there are multiple
ports in a LAG, LLDP transmit packets on each port without taking into
account the fact that the ports are in a LAG.
The operation of LLDP is independent of the STP status of an interface.
If 802.1x port access control is enabled at an interface, the device transmits
and receives LLDP packets to and from the interface only if the interface is
authenticated and authorized.
If a port is the target of mirroring, then LLDP considers it down.
NOTE:
LLDP are link layer protocols for directly-connected LLDP capable devices
to advertise themselves and their capabilities. In deployments where the
LLDP-capable devices are not directly connected and are separated with
LLDP- incapable devices, the LLDP-capable devices may be able to receive
the advertisement from other device(s) only if the LLDP-incapable devices
flood the LLDP packets they receive. If the LLDP-incapable devices perform
VLAN-aware flooding, then LLDPcapable devices can hear each other
only if they are in the same VLAN. An LLDPcapable device may receive
advertisements from more than one device if the LLDPincapable devices
flood the LLDP packets.
Workflows
Following are examples of actions that can be performed with the LLDP feature
and in a suggested order. You can refer to the LLDP/CDP section for additional
guidelines on LLDP configuration. LLDP configuration pages are accessible
under the Configuration > Port Management > Discovery LLDP menu.
1.
Enter LLDP global parameters, such as LLDP Frames Handling using the
LLDP Feature Configuration page.
2.
Configure LLDP per port by using the LLDP Feature Configuration page.
On this page, interfaces can be configured to receive/transmit LLDP
PDUs, send SNMP notifications, specify which TLVs to advertise, and
advertise the device’s management address.
3.
Create LLDP MED network policies by using the LLDP MED Network
Policy page.
4.
Associate LLDP MED network policies and the optional LLDP-MED TLVs
to the desired interfaces by using the LLDP MED Port Settings page.
Feature Configuration
The Feature Configuration Page enables configuration of LLDP global
parameters and entering the TLVs that are sent in the LLDP PDU.
The LLDP-MED TLVs to be advertised can be selected in the LLDP MED Port
Settings page, and the management address TLV of the device may be
configured to be advertised.
To configure the LLDP port settings:
STEP 1 Click Configuration > Port Management > Discovery LLDP >
Feature Configuration.
The following fields are displayed (only fields that do not appear in the Edit
page are described):
• Interface—The port to edit.
• LLDP MED Status—Enabled or disabled.
• Number of neighbors—Number of neighbors discovered.
• Neighbor Capability—Displays the primary functions of the neighbor; for
example: Bridge or Router.
• Local PoE—Local PoE information advertised.
• power priority—Port power priority
• power value—Port power value
• Neighbor PoE—PoE information advertised by the neighbor.
• power priority—Port power priority
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