Cisco Ex SERIES Manuel d'utilisateur télécharger pdf (Page 12)

APPLICATION NOTE - Deploying IP Telephony with EX Series Ethernet Switches

The LLDP-MED-capable VoIP phone now sets VLAN ID 99 for both voice and voice-signaling traffic in its LLDP-MED

network policy in response to the LLDP data unit it received previously.

Phones without LLDP-MED Support

While organizations can derive great benefits by using LLDP-MED-capable VoIP phones, the fact is that most existing

VoIP deployments don’t support the protocol, and businesses are unlikely to incur the cost required to upgrade these

devices. In such cases, there are several other IP telephony methods available that the EX Series can support. Each of

these solutions, however, has some unique requirements.

Using Access Port with Voice VLAN Feature (but without LLDP-MED)

Although the Voice VLAN feature delivers the greatest benefit when coupled with LLDP-MED-capable VoIP phones,

it is flexible enough that non-LLDP-MED-capable phones can also use it effectively. However, such a configuration

requires that the Voice VLAN feature be set manually on the VoIP phones themselves, since LLDP-MED is not available

to accomplish this dynamically.

Figure 11: Access port with voice VLAN feature

Once the Voice VLAN ID and other relevant parameters have been manually set on the VoIP phone to match the

settings configured on the EX Series, the feature behaves the same as it does when configured with LLDP-MED-

capable VoIP phones.

Using Access Port with the Same VLAN ID for Both Voice and Data

Another way to deploy an IP telephony solution is to assign both the VoIP phone and the end-host machine to a single

VLAN. This is the simplest configuration among the methods discussed in this document.

Figure 12: Both VoIP phone and endpoint device in the same VLAN

Data VLAN 10 VoIP VLAN 99

Non-LLDP-MED

Access Port

with Voice

VLAN feature

Data

VoIP

EX Series

VLAN 100 VLAN 100

Non-LLDP-MED

Data

VoIP

EX Series

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Cisco Ex SERIES Manuel d'utilisateur Page 12