Cisco Ex SERIES Manuel d'utilisateur télécharger pdf (Page 7)

APPLICATION NOTE - Deploying IP Telephony with EX Series Ethernet Switches

Using Voice VLAN Support with LLDP-MED

As mentioned earlier, the Voice VLAN feature enables EX Series switches to accept both untagged (data) and tagged

(voice) traffic from directly connected VoIP phones, and split these traffic streams into different VLANs. This feature

delivers its greatest benefit when connected to a VoIP phone capable of advertising and receiving LLDP-MED data

units, including VLAN ID assignments, because it essentially enables the EX Series to deliver a “plug-and-play” IP

telephony solution (Figure 6).

Figure 6: LLDP-MED-capable VoIP phone in a shared switch-port physical layout

The following section details the implementation shown in Figure 6.

The configuration of EX Series switches with the Voice VLAN feature in a typical shared switch-port implementation

with LLDP-MED-capable VoIP phones is as follows:

Data VLAN 10 Voice VLAN 99

LLDP-MED

Access Port

with Voice

VLAN feature

Data

VoIP

EX Series

user@switch# set protocols lldp interface all

user@switch# set protocols lldp-med interface all

user@switch# set vlans voip-only vlan-id 99

user@switch# set vlans data-only vlan-id 10

user@switch# set interfaces ge-0/0/1 unit 0 family ethernet-switching port-mode

access

user@switch# set interfaces ge-0/0/1 unit 0 family ethernet-switching vlan member

data-only

user@switch# set ethernet-switching-options voip interface ge-0/0/1.0 vlan voip-

only

user@switch# set ethernet-switching-options voip interface ge-0/0/1.0 forwarding-

class expedited-forwarding

user@switch# commit

Although these strings of data may appear overwhelming to someone who is unfamiliar with Juniper Networks Junos

operating system, the configuration semantics are actually very straightforward. A closer inspection of the individual

functional blocks will help explain what is happening and clarify the benefit of the Voice VLAN feature.

In the first functional block (below), the protocols to be used—LLDP and LLDP-MED—are turned on. Although these

protocols are turned on by default on any EX Series switch, it is specifically called out here for clarification.

user@switch# set protocols lldp interface all

user@switch# set protocols lldp-med interface all

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Cisco Ex SERIES Manuel d'utilisateur Page 7