Cisco Ex SERIES Manuel d'utilisateur télécharger pdf (Page 5)

APPLICATION NOTE - Deploying IP Telephony with EX Series Ethernet Switches

Figure 2 provides an overview of the LLDP/LLDP-MED message exchange sequence when an LLDP-MED-enabled VoIP

phone is first connected to a switch port on an EX Series Ethernet Switch.

Figure 2: LLDP and LLDP-MED interaction between EX Series Ethernet Switch and VoIP phone

Figure 3: An EX Series Ethernet Switch sending out LLDP data unit

This interaction can be seen in detail in the highlighted section of the packet capture shown in Figure 3. Note that

LLDP, as defined in IEEE 802.1AB, sends the data unit to a well-known IEEE multicast address (01:80:c2:00:00:0e).

This address is defined within a range of addresses reserved by the IEEE for protocols that are to be confined to an

individual LAN segment.

VoIP

EX Series

Interface will start advertising Base LLDP

LLDP-MED advertisement sent by neighbor

EX Series Ethernet Switch will

toggle to LLDP-MED

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Cisco Ex SERIES Manuel d'utilisateur Page 5