HP 5500 Ei 5500 Si Switch Series Configuration Guide

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Step Command Remarks 
4.  Configure the encoding 
format of the 
management address as 
character string.  lldp management-address-format 
string 
Optional. 
By default, the management address is 
encapsulated in the numeric format. 
 
 
Setting other LLDP parameters 
The Time to Live TLV carried in an LLDPDU determines how long the device information carried in the 
LLDPDU can be saved on a recipient device.  
By setting the TTL multiplier, you can configure the TTL of locally sent LLDPDUs, which...

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•  With Ethernet II encapsulation configured, an LLDP port sends LLDPDUs in Ethernet II frames and 
processes only incoming, Ethernet II encapsulated LLDPDUs.  
•   With SNAP encapsulation configured, an LLDP port sends LLDPDUs in SNAP frames and processes 
only incoming, SNAP encapsulated LLDPDUs.  
By default, Ethernet II frames encapsulate LLDPDUs. If the neighbor devices encapsulate LLDPDUs in 
SNAP frames, configure the encapsulation format for LLDPDUs as SNAP to guarantee normal...

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 CAUTION: 
The maximum TTL value that CDP allows is 255 seco
nds. To make CDP-compatible LLDP work properly 
with Cisco IP phones, be sure that the product of the TTL multiplier and the LLDPDU transmit interval is less
than 255 seconds. 
 
CDP-compatible LLDP operates in one of the follows modes: 
•   TxRx —CDP packets can be transmitted and received.  
•   Disable —CDP packets cannot be transmitted or received.  
To make CDP-compatible LLDP take effect on specific ports, first enable...

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•  Enable LLDP globally and on ports. 
•   Configure voice VLANs. 
Configuration procedure 
To enable LLDP to automati cally discover IP phones:  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enable LLDP to automatically 
discover IP phones.  voice vlan track lldp 
Disabled by default. 
 
 IMPORTANT: 
•
  When the switch is enabled to automatically discover IP phones throu
gh LLDP, you can connect at most
five IP phones to each port of the switch. 
•   You cannot use this...

 234 
Figure 75 Voice VLAN advertisement through LLDP 
 
 
With the received voice VLAN information, the IP phone automatically completes the voice VLAN 
configuration, including the voice VLAN ID, tagging status, and priority. This voice VLAN can be the 
voice VLAN directly specified for LLDP advertisement, the voice VLAN configured on the port, or the voice 
VLAN assigned by a server, depending on your configuration.  
To identify the voice VLAN advertised by LLDP, execute the  display lldp...

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Dynamically advertising server-assigned VLANs 
through LLDP 
Dynamic advertisement of server-assigned VLANs through LLDP must work with 802.1X or MAC 
authentication, and is available only for LLDP-enabled IP phones. If 802.1X authentication is used, make 
sure the IP phones also support 802.1X authentication.  
To implement this function for an IP phone, perform the following configuration tasks: 
•  Enable LLDP globally and on the port connected to the IP phone.  
•   Configure 802.1X or MAC...

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Task Command Remarks 
Display the global LLDP 
information or the information 
contained in the LLDP TLVs to be 
sent through a port. display lldp local-information
 [ global | interface  
interface-type interface-number  ] [ | { begin |  exclude 
|  include  } regular-expression  ]  Available in any 
view 
Display the information contained 
in the LLDP TLVs sent from 
neighboring devices.
 display lldp neighbor-information 
[ brief | interface 
interface-type interface-number  [ brief ] | list 
[...

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# Enable LLDP on GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2. (You can skip this step 
because LLDP is enabled on ports by defaul t.) Set the LLDP operating mode to Rx.  
[SwitchA] interface gigabitethernet 1/0/1 
[SwitchA-GigabitEthernet1/0/1] lldp enable 
[SwitchA-GigabitEthernet1/0/1] lldp admin-status rx 
[SwitchA-GigabitEthernet1/0/1] quit 
[SwitchA] interface gigabitethernet 1/0/2 
[SwitchA-GigabitEthernet1/0/2] lldp enable 
[SwitchA-GigabitEthernet1/0/2] lldp admin-status rx...

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Port status of LLDP            : Enable 
Admin status                   : Rx_Only 
Trap flag                      : No 
Polling interval               : 0s 
 
Number of neighbors:             1 
Number of MED neighbors        : 0 
Number of CDP neighbors        : 0 
Number of sent optional TLV    : 0 
Number of received unknown TLV : 3 
As the sample output shows, GigabitEthernet 1/0/1 of Switch A connects to an MED device, and 
GigabitEthernet 1/0/2 of Switch A connects to a  non-MED device. Both...

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Number of sent optional TLV     : 0 
Number of received unknown TLV  : 0 
As the sample output shows, GigabitEthernet 1/0/2 of Switch A does not connect to any 
neighboring devices.  
CDP-compatible LLDP configuration example 
Network requirements 
As shown in Figure 77 , GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 of Switch A are each 
connected to a Cisco IP phone. The two IP phones send out tagged voice traffic.  
Configure voice VLAN 2 on Switch A. Enable CDP compatibility of LLDP on Switch...