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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What is the recommended way to set up POE-LLDP fields after POE-hardware negotiation
I have been working a bit with POE powered devices and POE switches and I wish that the behavior of POE switches when it comes to POE-LLDP was more consistent.
For example, there is one type of switch ...
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Methods to detect when a POE powered DUT is connected to a POE switch behind a POE injector
I am working with POE powered devices, and one use case we see is that our device is connected to a POE injector, but behind the POE injector, there is a POE switch that can do LLDP negotiation.
(The ...
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POE 802.3at hardware vs LLDP negotiation
I have tested a 802.3at switch (POE PSE) that gives the PD device 25.5W through hardware negotiation.
After the PD device boots, it checks the LLDP POE fields and sees this:
So, the switch reports ...
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Interface goes up/down with LLDP neighbor creation message on a HP Aruba Switch
A customer has a HP Aruba Switch (i have no remote access, only via teamviewer) on which an interface goes up/down periodically. The customer has an ESX host connected to that interface, thats how he ...
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Show LLDP neighbors history
Is that possible to view the logs or history of a lldp neighbors, I just want to review a switch if the switch once connected to another switch.
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LLDP query - Why is LLDP supported on routers?
LLDP is a link layer protocol used on switched at layer 2. Why do routers support it since routers work on layer 3?
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Can LLDP be used by other end devices besides VoIP phones?
I've read somewhat about LLDP and LLDP-MED. It seems that as far as end devices go, they're mostly used by VoIP phones.
I'm interested in the idea of an end device implementing LLDP or LLDP-MED, so ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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?
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