Configuring for Network Management Applications

LLDP (Link-Layer Discovery Protocol)

■RFC 2737 (Entity MIB)

■RFC 2863 (Interfaces MIB)

■ANSI/TIA-1057/D6 (LLDP-MED; refer to “LLDP-MED(Media-Endpoint- Discovery)” on page 13-55.)

LLDP Operating Rules

(For additional information specific to LLDP-MED operation, refer to “LLDP- MED (Media-Endpoint-Discovery)” on page 13-55.)

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, then the port advertises the lowest-order IP address configured on that VLAN. If a port belongs to multiple VLANs, then 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, then 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 (page 13-52). (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, then 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.

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