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Automatically identifying IP phones through LLDP
If IP phones support LLDP, configure LLDP for automatic IP phone discovery on the device. The
device can then automatically discover the peer through LLDP, and exchange LLDP TLVs with the
peer.
If the LLDP System Capabilities TLV received on a port indicates that the peer can act as a telephone,
the device performs the following operations:
1.
Sends an LLDP TLV with the voice VLAN configuration to the peer.
2.
Assigns the receiving port to the voice VLAN.
3.
Increases the transmission priority of the voice packets sent from the IP phone.
4.
Adds the MAC address of the IP phone to the MAC address table to ensure that the IP phone
can pass authentication.
Use LLDP instead of the OUI list to identify IP phones if the network has more IP phone categories
than the maximum number of OUI addresses supported on the device. LLDP has higher priority than
the OUI list. For more information about LLDP, see "
Advertising the voice VLAN information to IP
phones
shows the workflow of advertising the voice VLAN information to IP phones.
Figure 49 Workflow of advertising the voice VLAN information to IP phones
IP phone access methods
Connecting the host and the IP phone in series
As shown in
, the host is connected to the IP phone, and the IP phone is connected to the
device. In this scenario, the following requirements must be met:
•
The host and the IP phone use different VLANs.
•
The IP phone is able to send out VLAN-tagged packets, so that the device can differentiate
traffic from the host and the IP phone.
•
The port connecting to the IP phone forwards packets from the voice VLAN and the PVID.
Summary of Contents for H3C S7500E-X
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