Cisco 500 series Administration Manual page 137

Configuring Discovery
Configuring CDP
Cisco 500 Series Stackable Managed Switch Administration Guide
• CDP Frames Handling—If CDP is not enabled, select the action to be taken
if a packet that matches the selected criteria is received:
Bridging
- —Forward the packet based on the VLAN.
Filtering
- —Delete the packet.
- Flooding —VLAN unaware flooding that forwards incoming CDP packets
to all the ports excluding the ingress ports.
• CDP Voice VLAN Advertisement—Select to enable the switch to advertise
the voice VLAN in CDP on all of the ports that are CDP enabled, and are
member of the voice VLAN. The voice VLAN is configured in the Voice VLAN
Properties page.
• CDP Mandatory TLVs Validation—If selected, incoming CDP packets not
containing the mandatory TLVs are discarded and the invalid error counter is
incremented.
• CDP Version—Select the version of CDP to use.
• CDP Hold Time—Amount of time that CDP packets are held before the
packets are discarded, measured in multiples of the TLV Advertise Interval.
For example, if the TLV Advertise Interval is 30 seconds, and the Hold
Multiplier is 4, then the LLDP packets are discarded after 120 seconds. The
following options are possible:
- Use Default—Use the default time (180 seconds)
- User Defined—Enter the time in seconds.
• CDP Transmission Rate—The rate in seconds at which CDP advertisement
updates are sent. The following options are possible:
- Use Default—Use the default rate (60 seconds)
- User Defined—Enter the rate in seconds.
• Device ID Format—Select the format of the device ID (MAC address or
serial number).
• Source Interface—IP address to be used in the TLV of the frames. The
following options are possible:
- Use Default—Use the IP address of the outgoing interface.
- User Defined—Use the IP address of the interface (in the Interface field)
in the address TLV.
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