Interface and Hardware Components Configuration Guide, Cisco IOS XE 17.17.x (Catalyst 9300 Switches) - Configuring LLDP, LLDP-MED, and Wired Location Service

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/17-17/configuration_guide/int_hw/b_1717_int_and_hw_9300_cg/configuring_lldp__lldp_med__and_wired_location_service.html

Published

2025-03-31

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco copyright; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• The Catalyst 9300 guide says that when CDP and LLDP both run on a switch, LLDP must be disabled on interfaces that use CDP for power negotiation, for example with no lldp tlv-select power-management or no lldp transmit and no lldp receive. in context
• The Catalyst 9300 IOS XE 17.17.x guide's Default LLDP Configuration table lists LLDP global state, interface state, transmit and receive as Disabled. in context
• Catalyst 9300 (IOS XE 17.17.x) LLDP defaults are a 120-second holdtime, a 30-second update timer and a 2-second reinitialization delay. in context
• By default a Catalyst 9300 sends only plain LLDP packets on a port until it receives LLDP-MED packets from the end device. in context
• Catalyst 9300 supports these LLDP-MED TLVs: LLDP-MED capabilities, network policy, power management, inventory management and location. in context
• On Catalyst 9300, if a network-policy profile is configured on an interface first, switchport voice vlan can no longer be applied there, but a network-policy profile can be added to an interface that already has switchport voice vlan. in context
• On Catalyst 9300 the LLDP-MED network policy TLV carries the VLAN, the Layer 2 class of service (CoS) and the DSCP value for an application such as voice. in context
• Inference: on a Catalyst 9300 left at documented defaults, a non-Cisco phone that learns its VLAN only through LLDP-MED will not get a voice VLAN until LLDP is enabled globally (lldp run), because CDP is on by default and LLDP is off. inferred in context

Cite this source record

APA

WarmTransfer. (2025, March 31). Interface and Hardware Components Configuration Guide, Cisco IOS XE 17.17.x (Catalyst 9300 Switches) - Configuring LLDP, LLDP-MED, and Wired Location Service. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cat9300-1717-lldp-lldp-med

BibTeX

@misc{warmtransfer-cisco-cat9300-1717-lldp-lldp-med,
  title  = {Interface and Hardware Components Configuration Guide, Cisco IOS XE 17.17.x (Catalyst 9300 Switches) - Configuring LLDP, LLDP-MED, and Wired Location Service},
  author = {{WarmTransfer}},
  year   = {2025},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cat9300-1717-lldp-lldp-med},
  note   = {Cisco Systems, accessed 2026-09-24}
}