A customer has Voice IP (VoIP) phones that support Link Layer Discovery Protocol Media
Endpoint Discovery (LLDP-MED). The phase need to receive their VLAN ID using this protocol.
The network architect is proposing HP 5500-48G-PoE+EI switches. Each user computer connects
to the phone, which then connects to the Ethernet jack. LLDP is enabled on the switch. Each Edge
port is trunk port that permits VLAN 10 (the user VLAN) and VLAN 20 (the voice VLAN).
Which other setting recommended on the edge port?
A.
The voice VLAN is enabled
B.
The PVID is set to VLAN 20
C.
LLDP Cisco Discovery Protocol (CDP) compliance enabled
D.
The LLDP voice VLAN ID is set to 20
Correct ans is D
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“LLDP Cisco Discovery Protocol (CDP) compliance enabled” – wrong! LLDP compliance need only for VoIP phone with CDP support
Correct answer is B
From study guide:
Make sure that the port can receive traffic that is tagged for the voice VLAN and untagged for the user or data VLAN.
On Comware switches the typical setup is:
– Port type = Trunk (or hybrid)
– Port PVID (untagged VLAN) = Data VLAN ID
– Permitted VLANs = Data VLAN ID, voice VLAN ID
– LLDP voice VLAN = Voice VLAN ID
– Voice VLAN QoS = 802.1p value 5 (or 6) and DSCP 46
The final two settings configure the switch to inform connected LLDP-MED-capable phones of the voice VLAN ID and priorities.
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interface GigabitEthernet1/0/2
port link-type trunk
undo port trunk permit vlan 1
port trunk permit vlan 100 200
undo voice-vlan mode auto
voice-vlan 200 enable
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Correct – D
Use “lldp voice-vlan [vlan-id]” to configure a port to advertise a specific voice VLAN ID to the connected IP phone through LLDP. If CDP compatibility is enabled, LLDP also includes the specified voice VLAN ID in the CDP packets sent to the IP phone.
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