Lldp And Cdp - Cisco 500 Series Administration Manual

Administration: Discovery

LLDP and CDP

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LLDP and CDP
Cisco 500 Series Stackable Managed Switch Administration Guide
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.
To enable Bonjour on an interface, click Add.
Select the interface, and click Apply.
Click Delete to disable Bonjour on an interface (this performs the delete operation
without any additional operation, such as Apply).
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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