Lldp And Cdp - Cisco SF220-24 Administration Manual

Administration: Discovery

LLDP and CDP

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STEP 3
LLDP and CDP
Cisco 220 Series Smart Switches Administration Guide Release 1.1.0.x
To globally enable or disable Bonjour:
Click Administration > Discovery Bonjour.
Check Enable to enable Bonjour Discovery globally on the switch, or uncheck to
disable it globally.
Click Apply. Bonjour is enabled or disabled on the switch, and the Running
Configuration is updated.
Link Layer Discovery Protocol (LLDP) and Cisco Discovery Protocol (CDP) are link
layer protocols for directly connected LLDP and CDP-capable neighbors to
advertise themselves and their capabilities to each other. By default, the switch
sends an LLDP or CDP advertisement periodically to all its interfaces and
terminates 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.
In deployments where the CDP-capable (or LLDP-capable) devices are not
directly connected and are separated with CDP-incapable (or LLDP-incapable)
devices, the CDP-capable (or LLDP-capable) devices may be able to receive the
advertisement from other devices only if the CDP-incapable (or LLDP-incapable)
devices flood the CDP (or LLDP) packets they receive. If the CDP-incapable (or
LLDP-incapable) devices perform VLAN-aware flooding, then CDP-capable (or
LLDP-capable) devices can hear each other only if they are in the same VLAN.
It should be noted that a CDP-capable (or LLDP-capable) device may receive
advertisement from more than one device if the CDP-incapable (or LLDP-
incapable) devices flood the CDP (or LLDP) packets.
The following are additional points about CDP and LLDP configuration:
• CDP and LLDP can be enabled or disabled globally as well as on each port.
The CDP or LLDP capability of a port is relevant only if CDP or LLDP is
globally enabled.
• If CDP or LLDP is globally enabled, the switch filters out incoming CDP or
LLDP packets from ports that are CDP-disabled or LLDP-disabled.
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