Questions tagged [lldp]

Link-Layer Discovery Protocol (LLDP) is used by network devices to advertise and discover other pieces of equipment across the network. It is defined in IEEE 802.1AB and extended as LLDP-MED in ANSI/TIA-1057.

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How can i find which cisco switch port is connnected to specific port of Fortigate?

there is any way to find that which switch port connected to mgmt port of fortigate? for example can i enable lldp on Cisco switch and Fortigate together? Fortigate 1500D (version 5.6.2) and switch is ...
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1answer
47 views

Connecting DELL N1548 to HP Core switch with LAN

I currently have a setup with a HP core switch with few VLANs configured on it e.g. vlan 10, 20, 30, 40. However when I uplink my DELL N1548 to the HP core switch, I cannot connect anything behind ...
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1answer
112 views

POE negotiation between IEEE PD and the POE Switch?

I know that there happens a negotiation between the IEEE PD devices and directly connected POE Switch through CDP or LLDP protocols. But if for some unknown reasons, if the CDP/LLDP is disabled on the ...
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486 views

Is there a Layer 2 address advertising protocol?

I needed help in understanding if LLDP/CDP is the Layer 2 equivalent to RIP or say any Layer 3 route advertising protocol. If not,is there a protocol that advertises the MAC Address Tables among ...
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1answer
70 views

Unidirectional LLDP

What is the first step to t-shoot unidirectional LLDP? I have a scenario (on a backbone circuit) where the A-router (Junos PTX1000) is seeing it's expected LLDP neighbor but the Z-router (Cisco ASR9k) ...
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2answers
289 views

DLEP vs LLDP for communication devices discovery

I'm looking for a simple way to allow a router discover communication devices over a LAN. I've heard a bit about DLEP and LLDP, but aside from understanding that LLDP is older, and DLEP has only ...
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1answer
196 views

Does a switch LLDP MIB contain MAC addresses of connected servers?

Suppose I have a top-of-rack switch configured with LLDP. The servers in the rack are not running LLDP and therefore do not send LLDPDUs. Does the MIB from the switch contain the MAC addresses of the ...
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1answer
145 views

Newb question, about LLDP for inventory

New (to enterprise networking) guy-- My org is facing room re-numbering of a 5 building, multi floor campus, wherein all nodes (PCs, printers, A/V) will need to be renamed. Wondering if, after the ...
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2answers
502 views

Cisco LLDP config question

I am following the guide that is listed here for enabling LLDP on my Cisco Catalyst 3560G switch. In short I entered the following into my switch. Switch# configure terminal Switch(config)# lldp run ...
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2answers
303 views

Does LLDP support traversing through multiple switches?

I would like to query a LLDP enabled switch / router for information about current FW, Manufacturer, etc... But I am not directly connected to the switch, but through an Access Layer Switch or a ...
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2answers
1k views

Couldn't activate the CDP compatibility in the HP V1910 web interface

I tried to enable both LLDP and CDP from the web interface of my V1910 switch, but every time I select enable the session logs out. I found a command to enable the LLDP from the the switch's terminal. ...
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1answer
659 views

CDP/LLDP over LACP Trunk Several Devices

I have a 4-switch stack of Alcatel Omniswitches connected to an HP 5412 core via 8 uplinks; these are ports D11-D18. Unfortunately, the client did not yet give me access to the Alcatels, but a request ...
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2answers
242 views

LLDP disable specific TLVs?

My techs just got a pile of fluke test equipment, which can use LLDP to determine what switchport it is connected to. However, the network guys have disabled lldp / cdp as by default it exposes the ...
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1answer
2k views

Does LLDP packet traverse switches?

I have some nodes (An) connected to switch A and others (Bm) connected to switch B. Should Bm nodes receive LLDP packets from switch A?
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1answer
4k views

Behavior of LLDP packets through tagged port

I have this simple topology - [S1][p1]----[p2][S2] Port p1 of switch S1 is connected to port p2 of S2. And port p2 on S2 is tagged. My doubt is if an LLDP packet is sent from p1 to p2, considering ...
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3answers
575 views

Map the underlying structure of a VLAN

Is there any way to detect the underlying layout physical layout of a VLAN. For instance, to know whether two devices in the same VLAN are connected via the same wifi AP. To clarify, this would be ...
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2answers
10k views

Difference between LLDP and LLDP-MED

What is the difference between LLDP and LLDP-MED? Is LLDP-MED an add-on to LLDP or something completely different?