Cisco 500 Series - LLDP and CDP

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Administration: Discovery

LLDP and CDP

Cisco 500 Series Stackable Managed Switch Administration Guide 146

STEP 3 Click Apply to update the Running Configuration file.

The Bonjour Discovery Interface Control table displays the Interface Name of the

interfaces on which Bonjour is enabled and their IP Address.

STEP 4 To enable Bonjour on an interface, click Add.

STEP 5 Select the interface, and click Apply.

NOTE Click Delete to disable Bonjour on an interface (this performs the delete operation

without any additional operation, such as Apply).

LLDP and CDP

LLDP (Link Layer Discovery Protocol) and CDP (Cisco Discovery Protocol) are link

layer protocols for directly-connected LLDP and CDP-capable neighbors to

advertise themselves and their capabilities. By default, the device sends an LLDP/

CDP advertisement periodically to all its interfaces and processes incoming LLDP

and CDP packets as required by the protocols. In LLDP and CDP, advertisements

are encoded as TLV (Type, Length, Value) in the packet.

The following CDP/LLDP configuration notes apply:

• CDP/LLDP can be enabled or disabled globally or per port. The CDP/LLDP

capability of a port is relevant only if CDP/LLDP is globally enabled.

• If CDP/LLDP is globally enabled, the device filters out incoming CDP/LLDP

packets from ports that are CDP/LLDP-disabled.

• If CDP/LLDP is globally disabled, the device can be configured to discard,

VLAN-aware flooding, or VLAN-unaware flooding of all incoming CDP/LLDP

packets. VLAN-aware flooding floods an incoming CDP/LLDP packet to the

VLAN where the packet is received excluding the ingress port. VLAN-

unaware flooding floods an incoming CDP/LLDP packet to all the ports

excluding the ingress port. The default is to discard CDP/LLDP packets

when CDP/LLDP is globally disabled. You can configure the discard/

flooding of incoming CDP and LLDP packets from the CDP Properties page

and the LLDP Properties page respectively.

• Auto Smartport requires CDP and/or LLDP to be enabled. Auto Smartport

automatically configures an interface based on the CDP/LLDP

advertisement received from the interface.

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