HP 5500 Ei 5500 Si Switch Series Configuration Guide
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230 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 determines how long information about the local device can be saved on a neighboring device. The TTL is expressed by using the following formula: TTL = Min (65535, (TTL multiplier × LLDPDU transmit interval)) A s t he ex p re ss ion s hows, t h e T T L c a n be u p to 65535 se c on d s. T T L s g re a te r t h a n 65535 wil l b e rou n d e d down to 65535 seconds. Configuration restrictions and guidelines • To make sure that LLDP neighbors can receive LLDPDUs to update information about the current device before it ages out, configure both the LLDPD U transmit interval and delay to be less than the TTL. • It is a good practice to set the LLDPDU transmit in terval to be no less than four times the LLDPDU transmit delay. • If the LLDPDU transmit delay is greater than the LLDPDU transmit interval, the device uses the LLDPDUs transmit delay as the transmit interval. Configuration procedure To change the TTL multiplier: Step Command Remarks 1. Enter system view. system-view N/A 2. Set the TTL multiplier. lldp hold-multiplier value Optional. 4 by default. 3. Set the LLDPDU transmit interval. lldp timer tx-interval interval Optional. 30 seconds by default. 4. Set the LLDPDU transmit delay. lldp timer tx-delay delay Optional. 2 seconds by default. 5. Set the number of LLDPDUs sent each time fast LLDPDU transmission is triggered. lldp fast-count count Optional. 3 by default. Setting an encapsulation format for LLDPDUs LLDPDUs can be encapsulated in the following formats: Ethernet II or SNAP frames.
231 • 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 communication with the neighbors. To set the encapsulation format for LLDPDUs to SNAP: Step Command Remarks 1. Enter system view. system-view N/A 2. Enter Ethernet interface view or port group view. • Enter Layer 2/Layer 3 Ethernet interface view: interface interface-type interface-number • Enter port group view: port-group manual port-group-name Use either command. 3. Set the encapsulation format for LLDPDUs to SNAP. lldp encapsulation snap Ethernet II encapsulation format applies by default. NOTE: LLDP-CDP (Cisco Discovery Protocol) packets use only SNAP encapsulation. Configuring CDP compatibility To make your device work with Cisco IP phones, you must enable CDP compatibility. If your LLDP-enabled device cannot recognize CDP packe ts, it does not respond to the requests of Cisco IP phones for the voice VLAN ID configured on the device. As a result, a requesting Cisco IP phone sends voice traffic without any tag to your device, and, as a result, your device cannot differentiate the voice traffic from other types of traffic. With CDP compatibility enabled, your device can receive and recognize CDP packets from a Cisco IP phone and respond with CDP packets, which carry the voice VLAN configuration TLVs. According to the voice VLAN configuration TLVs, the IP phone automatically configures the voice VLAN. As a result, the voice traffic is confined in the configured voice VLAN, and differentiated from other types of traffic. For more information about voice VLANs, see Configuring a voice VLAN. Configuration prerequisites Before you configure CDP compatibility, complete the following tasks: • Globally enable LLDP. • E n a b l e L L D P o n t h e p o r t c o n n e c t i n g t o a n I P p h o n e and configure the port to operate in TxRx mode. Configuring CDP compatibility
232 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 CDP-compatible LLDP globally, and then configure CDP-compatible LLDP to operate in TxRx mode. To enable LLDP to be compatible with CDP: Step Command Remarks 1. Enter system view. system-view N/A 2. Enable CDP compatibility globally. lldp compliance cdp Disabled by default. 3. Enter Ethernet interface view or port group view. • Enter Layer 2/Layer 3 Ethernet interface view: interface interface-type interface-number • Enter port group view: port-group manual port-group-name Use either command. 4. Configure CDP-compatible LLDP to operate in TxRx mode. lldp compliance admin-status cdp txrx Disable mode by default. Enabling LLDP to automatically discover IP phones In a traditional voice VLAN network, the switch maps the source MAC addresses of IP phones to a limited number of OUI addresses to allow them to access th e network. This method restricts the types of IP phones on the network, if the IP phones with the source MAC addresses match the same OUI address are categorized as a type. To break the restriction, you can enable the switch to automatically discover IP phones through LLDP. With this function, the switch can automatically discover the peer, and exchange LLDP TLVs with the peer. If the LLDP System Capabilities TLV received on a port sh ows that the peer is phone capable, the switch determines that the peer is an IP phone and sends an LLDP TLV carrying the voice VLAN configuration to the peer. When the IP phone discovery process is complete, the port will automatically join the voice VLAN and improve the transmission priority of the voice traffic for the IP phone. To ensure that the IP phone can pass authentication, the switch will add the MAC address of the IP phone to the MAC address table. For more information about voice VLANs, see Configuring a voice VLAN. Configuration prerequisites Before you enable the switch to automatically discover IP phones through LLDP, complete the following tasks:
233 • 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 function together with CDP compatibility. Configuring LLDP to advertise a specific voice VLAN Voice VLAN advertisement through LLDP is available only for LLDP-enabled IP phones. If CDP-compatibility is enabled, this feature is also available for CDP-enabled IP phones. For more information about CDP compatibility, see Configuring CDP compatibility. F or more information about the voice VLANs, see Configuring a voice VLAN . Configuration guidelines Use this feature in one of the following scenarios: • Decrease the voice VLAN processing delay in an IRF fabric. On an LLDP-enabled port, LLDP advertises the voice VLAN information to the IP hone connected to the port. When a packet arrives on the port, the switch compares the source MAC address against its voice device OUI list. If a match is found, th e switch learns the MAC address in the voice VLAN, and promotes the forwarding priority for the packet. Because this process is completed in software, in an IRF fabric, MAC address learning and synchr onization of the learned MAC address entry to all member devices introduces an undesirable delay. Directly specifying the voice VLAN to be advertised by LLDP enables the IRF fabric to lear n and synchronize MAC address entries faster in hardware. • Avoid configuring the voice VLAN function on a port. Figure 75 sh ows the procedure of voice VLAN advertisement through LLDP.
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 local-information command, and examine the MED information fields in the command output. Configuration procedure To configure LLDP to advertise a specific voice VLAN: Step Command Remarks 1. Enter system view. system-view N/A 2. Enable LLDP globally. lldp enable By default, LLDP is globally enabled. 3. Enter interface view or port group view. • Enter Layer 2 Ethernet interface view: interface interface-type interface-number • Enter port group view: port-group manual port-group-name Use one of the commands. 4. Enable LLDP. lldp enable Optional. By default, LLDP is enabled on a port. 5. Configure LLDP to advertise a specific voice VLAN. lldp voice-vlan vlan-id By default, LLDP advertises the voice VLAN configured on the port.
235 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 authentication to make sure the IP phone can pass security authentication. For more information about 802.1X authentication, MAC authentication, and VLAN assignment by servers, see Security Configuration Guide . • Configure VLAN authorization for the IP phone on the authentication server. After the IP phone passes authentication, LLDP advertises the server-assigned VLAN in the Network Policy TLV to the IP phone. The IP phone will send its traffic tagged with the assigned VLAN. Configuring LLDP trapping LLDP trapping notifies the network management system (NMS) of events such as newly-detected neighboring devices and link malfunctions. LLDP traps are sent periodically, and the interval is configurable. To prevent excessive LLDP traps from being sent when the topology is unstable, set a trap transmit interval for LLDP. To configure LLDP trapping: Step Command Remarks 1. Enter system view. system-view N/A 2. Enter Ethernet interface view or port group view. • Enter Layer 2/Layer 3 Ethernet interface view: interface interface-type interface-number • Enter port group view: port-group manual port-group-name Use either command. 3. Enable LLDP trapping. lldp notification remote-change enable Disabled by default. 4. Return to system view. quit N/A 5. Set the LLDP trap transmit interval. lldp timer notification-interval interval Optional. 5 seconds by default. Displaying and maintaining LLDP
236
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
[ system-name system-name ] ] [ | { begin | exclude |
include } regular-expression ] Available in any
view
Display LLDP statistics.
display lldp statistics
[ global | interface
interface-type interface-number ] [ | { begin | exclude
| include } regular-expression ] Available in any
view
Display LLDP status of a port.
display lldp status
[ interface interface-type
interface-number ] [ | { begin | exclude | include }
regular-expression ] Available in any
view
Display types of advertisable
optional LLDP TLVs. display lldp tlv-config
[ interface interface-type
interface-number ] [ | { begin | exclude | include }
regular-expression ] Available in any
view
LLDP configuration examples
Basic LLDP configuration example
Network requirements
As shown in Figure 76
, the NMS and Switch A are located in the same Ethernet. An MED device and
Switch B are connected to GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 of Switch A.
Enable LLDP on the ports of Switch A and Switch B to monitor the link between Switch A and Switch B and
the link between Switch A and the MED device on the NMS.
Figure 76 Network diagram
Configuration procedure
1. Configure Switch A:
# Enable LLDP globally.
system-view
[SwitchA] lldp enable
237 # 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 [SwitchA-GigabitEthernet1/0/2] quit 2. Configure Switch B: # Enable LLDP globally. system-view [SwitchB] lldp enable # Enable LLDP on GigabitEthernet1/0/1. (You can sk ip this step because LLDP is enabled on ports by default.) Set the LLDP operating mode to Tx. [SwitchB] interface gigabitethernet 1/0/1 [SwitchB-GigabitEthernet1/0/1] lldp enable [SwitchB-GigabitEthernet1/0/1] lldp admin-status tx [SwitchB-GigabitEthernet1/0/1] quit 3. Verify the configuration: # Display the global LLDP status an d port LLDP status on Switch A. [SwitchA] display lldp status Global status of LLDP: Enable The current number of LLDP neighbors: 2 The current number of CDP neighbors: 0 LLDP neighbor information last changed time: 0 days,0 hours,4 minutes,40\ seconds Transmit interval : 30s Hold multiplier : 4 Reinit delay : 2s Transmit delay : 2s Trap interval : 5s Fast start times : 3 Port 1 [GigabitEthernet1/0/1]: Port status of LLDP : Enable Admin status : Rx_Only Trap flag : No Polling interval : 0s Number of neighbors: 1 Number of MED neighbors : 1 Number of CDP neighbors : 0 Number of sent optional TLV : 0 Number of received unknown TLV : 0 Port 2 [GigabitEthernet1/0/2]:
238 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 ports operate in Rx mode, and they only receive LLDPDUs. # Remove the link between Switch A and Switch B and then display the global LLDP status and port LLDP status on Switch A. [SwitchA] display lldp status Global status of LLDP: Enable The current number of LLDP neighbors: 1 The current number of CDP neighbors: 0 LLDP neighbor information last changed time: 0 days,0 hours,5 minutes,20\ seconds Transmit interval : 30s Hold multiplier : 4 Reinit delay : 2s Transmit delay : 2s Trap interval : 5s Fast start times : 3 Port 1 [GigabitEthernet1/0/1]: Port status of LLDP : Enable Admin status : Rx_Only Trap flag : No Polling interval : 0s Number of neighbors : 1 Number of MED neighbors : 1 Number of CDP neighbors : 0 Number of sent optional TLV : 0 Number of received unknown TLV : 5 Port 2 [GigabitEthernet1/0/2]: Port status of LLDP : Enable Admin status : Rx_Only Trap flag : No Polling interval : 0s Number of neighbors : 0 Number of MED neighbors : 0 Number of CDP neighbors : 0
239 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 A to allow the Cisco IP phones to automatically configure the voice VLAN, confining their voice traffic within the voice VLAN and isolating the voice traffic from other types of traffic. Figure 77 Network diagram Configuration procedure 1. Configure a voice VLAN on Switch A: # Create VLAN 2. system-view [SwitchA] vlan 2 [SwitchA-vlan2] quit # Set the link type of GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 to trunk and enable voice VLAN on them. [SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] port link-type trunk [SwitchA-GigabitEthernet1/0/1] voice vlan 2 enable [SwitchA-GigabitEthernet1/0/1] quit [SwitchA] interface gigabitethernet 1/0/2 [SwitchA-GigabitEthernet1/0/2] port link-type trunk [SwitchA-GigabitEthernet1/0/2] voice vlan 2 enable [SwitchA-GigabitEthernet1/0/2] quit 2. Configure CDP-compatible LLDP on Switch A: # Enable LLDP globally and enable LLDP to be compatible with CDP globally. [SwitchA] lldp enable [SwitchA] lldp compliance cdp # Enable LLDP (you can skip this step because LLDP is enabled on ports by default.), configure LLDP to operate in TxRx mode, and configure CDP-compatible LLDP to operate in TxRx mode on GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2. [SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] lldp enable [SwitchA-GigabitEthernet1/0/1] lldp admin-status txrx [SwitchA-GigabitEthernet1/0/1] lldp compliance admin-status cdp txrx