mikrotik and juniper lldp issu

RouterOS General
1

Hello,

I have a juniper ex4200 and i connect a mikrotik ccr 1072 to it, but my mikrotik can not discover it,

  1. my mikrotik ccr neighbour discovery is set to all interface

  2. this my juniper configs

rstp;
lldp {
interface all;
}
lldp-med {
interface all;
}





any idea how solve it?

thanks

2

The first step is to run /tool sniffer quick interface=the-one-connected-to-juniper mac-protocol=lldp to see whether the devices are sending LLDP frames to each other. Mikrotik sends them once a minute with a validity (TTL) of 120 seconds. If you can see them in both directions, set the /tool sniffer to write into a file and run it again; after seeing some frames to be sent, stop the sniffer, download the file to PC and use Wireshark to see what’s wrong with them.

3

Hi,
in mac-procotol there is no lldp , what should i choose?

4

i used 88CC and it works, but there is no lldp packets, they are connected physcally together and another cisco is connected to that juniper but that cisco can see juniper.. its strange.

5

What ROS version are you running on the CCR, and what management interface do you use? I’m running it from the command line on 6.45.7 and the lldp choice is offered as mac-protocol value

What surprises me that you can’t see them in either direction.

6

I have a mikrotik router as a manageme t router and a 2960 ia connected to it then juniper vme is connected to that switch, now 2960 can see lldp but management mikrotik can not !

7

now wait a bit… are the Juniper and the CCR connected directly to each other using just a passive media (copper of fiber patchcord) or they are interconnected only via the C2960?

8

they are interconnected via C2960

9

In this case they cannot see each other via LLDP and it is by design. LLDP is one of protocols which switches do not forward between ports. So with LLDP enabled on all three devices, Mikrotik and Juniper should each see the 2960 and the 2960 should see both of them.

Imagine a phone in place of the Tik, it must get the media and PoE information only from the switch to which it is directly connected.

And imagine what if LLDP was forwarding information from all neighbors to other neighbors (with some “distance” parameter): in larger networks the amount of LLDP traffic would be huge and each element would have to maintain the complete topology of the network.

To build the network topology overview from information obtained using LLDP, monitoring systems query the information about neighbours from each element separately.

10

Understood,
thank you for correct my question,
i thought 2960 can forward lldp to my mikrotik,
anyway
thank you so much!