Configuring for Network Management Applications

 

LLDP (Link-Layer Discovery Protocol)

 

 

N o t e

LLDP-MED operation requires the macphy_config TLV subelement—enabled

 

by default—that is optional for IEEE 802.1AB LLDP operation. Refer to the

 

dot3TlvEnable macphy_config command on page 13-53.

 

Network Policy Advertisements. Network policy advertisements are

 

 

intended for real-time voice and video applications, and include these TLV

 

subelements:

 

Layer 2 (802.1p) QoS

 

Layer 3 DSCP (diffserv code point) QoS

 

Voice VLAN ID (VID)

 

VLAN Operating Rules. These rules affect advertisements of VLANs in

 

network policy TLVs:

 

The VLAN ID TLV subelement applies only to a VLAN configured for voice

 

operation (vlan < vid > voice).

 

If there are multiple voice VLANs configured on a port, LLDP-MED

 

advertises the voice VLAN having the lowest VID.

 

The voice VLAN port membership configured on the switch can be tagged

 

or untagged. However, if the LLDP-MED endpoint expects a tagged mem­

 

bership when the switch port is configured for untagged, or the reverse,

 

then a configuration mismatch results. (Typically, the endpoint expects

 

the switch port to have a tagged voice VLAN membership.)

 

If a given port does not belong to a voice VLAN, then the switch does not

 

advertise the VLAN ID TLV through this port.

 

Policy Elements. These policy elements may be statically configured on the

 

switch or dynamically imposed during an authenticated session on the switch

 

using a RADIUS server and 802.1X or MAC authentication. (Web

 

authentication does not apply to VoIP telephones and other

 

telecommunications devices that are not capable of accessing the switch

 

through a Web browser.) The QoS and voice VLAN policy elements can be

 

statically configured with the following CLI commands:

 

vlan < vid > voice

 

vlan < vid > < tagged untagged > < port-list>

 

int < port-list> qos priority < 0 - 7 >

 

vlan < vid > qos dscp < codepoint >

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