A2 enabled tx_rx
A3 enabled tx_rx
When CDP mode is not pre-standard voice, the admin-status column is note displayed.
The show cdp output when cdp run and cdp mode rxonly are enabled
switch(config)# show cdp
Global CDP Information
Enable CDP [Yes} : Yes
CDP mode [rxonly] : rxonly
Port CDP
---- --------
A1 enabled
A2 enabled
A3 enabled
The show running-config when admin-status is configured
switch(config)# show running-config
Running configuration:
; J9477A Configuration Editor; Created on release #XX.16.09.0000x
; Ver #03:01:1f:ef:f2
hostname “Switch”
module 1 type J9307A
cdp mode pre-standard-voice admin-status A5 RxOnly
Filtering CDP information
In some environments it is desirable to be able to configure a switch to handle CDP packets by filtering out the
MAC address learns from untagged VLAN traffic from IP phones. This means that normal protocol processing
occurs for the packets, but the addresses associated with these packets is not learned or reported by the software
address management components. This enhancement also filters out the MAC address learns from LLDP and
802.1x EAPOL packets on untagged VLANs.
The feature is configured per-port.
Configuring the switch to filter untagged traffic
Enter this command to configure the switch not to learn CDP, LLDP, or EAPOL traffic for a set of interfaces.
Syntax:
[no] ignore-untagged-mac <port-list>
Prevents MAC addresses from being learned on the specified ports when the VLAN is untagged and the
destination MAC address is one of the following:
• 01000C-CCCCCC (CDP)
• 0180c2- 00000e (LLDP)
• 0180c2-000003 (EAPOL)
Chapter 7 Configuring for Network Management Applications 253
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