LLDP operating rules
For additional information specific to LLDP-MED operation, see LLDP-MED (media-endpoint-discovery) on
page 187.
Port trunking
LLDP manages trunked ports individually. That is, trunked ports are configured individually for LLDP operation, in
the same manner as non-trunked ports. Also, LLDP sends separate advertisements on each port in a trunk, and
not on a per-trunk basis. Similarly, LLDP data received through trunked ports is stored individually, per-port.
IP address advertisements
In the default operation, if a port belongs to only one static VLAN, the port advertises the lowest-order IP address
configured on that VLAN. If a port belongs to multiple VLANs, the port advertises the lowest-order IP address
configured on the VLAN with the lowest VID. If the qualifying VLAN does not have an IP address, the port
advertises 127.0.0.1 as its IP address. For example, if the port is a member of the default VLAN (VID=1), and
there is an IP address configured for the default VLAN, the port advertises this IP address. In the default
operation, the IP address that LLDP uses can be an address acquired by DHCP or Bootp.
You can override the default operation by configuring the port to advertise any IP address that is manually
configured on the switch, even if the port does not belong to the VLAN configured with the selected IP address
(
Configuring a remote management address for outbound LLDP advertisements (CLI) on page 182). (Note
that LLDP cannot be configured through the CLI to advertise an addresses acquired through DHCP or Bootp.
However, as mentioned above, in the default LLDP configuration, if the lowest-order IP address on the VLAN with
the lowest VID for a given port is a DHCP or Bootp address, the switch includes this address in its LLDP
advertisements unless another address is configured for advertisements on that port.) Also, although LLDP allows
configuring multiple remote management addresses on a port, only the lowest-order address configured on the
port will be included in outbound advertisements. Attempting to use the CLI to configure LLDP with an IP address
that is either not configured on a VLAN or has been acquired by DHCP or Bootp results in the following error
message.
xxx.xxx.xxx.xxx: This IP address is not configured or is a DHCP address.
Spanning-tree blocking
Spanning tree does not prevent LLDP packet transmission or receipt on STP-blocked links.
802.1X blocking
Ports blocked by 802.1X operation do not allow transmission or receipt of LLDP packets.
Configuring LLDP operation
Displaying the global LLDP, port admin, and SNMP notification status (CLI)
In the default configuration, LLDP is enabled and in both transmit and receive mode on all active ports. The LLDP
configuration includes global settings that apply to all active ports on the switch, and per-port settings that affect
only the operation of the specified ports.
The commands in this section affect both LLDP and LLDP-MED operation. for information on operation and
configuration unique to LLDP-MED, refer to “LLDP-MED (Media-Endpoint-Discovery)”.
Syntax:
show lldp config
176 Aruba 2530 Management and Configuration Guide for
ArubaOS-Switch 16.05
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