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IP Telephony (Features (LLDP-MED, CoS, Voice VLAN, Power over Ethernet),…
IP Telephony
Features
LLDP-MED
CoS
Voice VLAN
Power over Ethernet
PoE
Definition
PoE+
802.3at
30W
Backward Compatible
PoE
15.4W
802.3af
Roles
Power Sourcing Equipment
Powered Device
Power Budget
To power PD
Pool of Watts
Power Managements
Static
Set power manually
Class
Based on class information
Classes
0 (15W)
1 (4W)
2 (8W)
3 (15W)
4 (30W)
Deployments
VoIP phone and host use same port
Cost efficient
VoIP quality might suffer
VoIP phone and host use separate port
LLDP
Characteristics
One-way
Unsecured
Link-local
Periodic
Default 30s 4x hold
LLDP-MED
Usage
Location Service
Power Negotiation
Policy Distribution
Classes
1 (generic endpoints)
2 (media endpoints (ip))
3 (com devices)
4 (network devices)
Commands
Junos
VoIP
# edit ethernet-switching-options voip interface [interface]
vlan [voice-vlan]
forwarding-class [forwarding class]
# set vlans [voice vlan] vlan-id [id]
> show
vlans
ethernet-switching
PoE
# edit poe
interface [interface]
telemetries
maximum-power
priority
fpc [fpc]
management
maximum-power
> show poe