Switching

Hi,

I configured RTG with 2 interfaces on EX4300 switches (junos 14.1), theese 2 interfaces are connected to 2 QFX5100 as in the attachement file. (please see attachement).

- spanning tree is deactivated on all switches.

- I'm using L3 vlan (irb interface) to manage the switches.

Switch configuration is default configuration, with vlans added and trunk interfaces.  for now, only interconnect interfaces are used.

First the RTG was opérational, but after I rebooted an EX4300, interfaces, irb and RTG were UP but the switch was no longer reachable on the network. no ping is passing to or from the EX4300 and no ssh eather.

EX4300> show redundant-trunk-group
Group Interface State Time of last flap Flap
name count

rtg0 xe-0/2/0.0 Up/Pri/Act 2016-03-03 10:50:32 UTC (00:00:32 ago) 5
xe-0/2/1.0 Up 2016-03-03 10:27:48 UTC (00:23:16 ago) 7

the default gateway is UP.

there are no entries in the arp table and the "monitor traffic" on the interface shows the ping request reaching the switch but no reply going back.

Then I shut one of the RTG 2 interfaces on the QFX5100 side, and the EX4300 became to life, ping is passing again same as SSH connections.

After unshuting this interface, the EX4300 still reachable, but some destinations aren't !

but every time I clear the arp table, I get the same situation of EX4300 unreachable!

I don't know if switching still works while this issue occures, since I don't have servers connected yet.

It's a very wierd behavior!

Any help please?

This is fixed in 15.1X53-D35, which got released yesterday,  Unfortunately this is not called out in the RN, but pre-testing of this released show this situation to be solved.

Thanks for your reply, but you mean 14.1X53-D35 because I don't find 15.1X53-D35 in the download base.

I forgot to mention that LLDP is not working eather in 14.1X53-D30.3 . the EX4300 replies to LLDP but its neighbour table remain empty.

Sorry, yes I meant 14.1X53-D35, not 15.1.  Sorry no idea about LLDP, but believe that should work fine, or are you talking about specficially with these RTG connections?  I suggest you try 14.1X53-D35 and then see where you stand.  If LLDP is not still working, the you really need to go to TAC.

ok, I'll upgrade to 14.1X53-D35, do some tests and give you feedback.

After upgrading to 14.1X53-D35, everything is working as expected, no more ARP issue and LLDP neighbours table is populated.

many thanks.

Good to hear.  Can you mark this a solution?  Thanks