OK, on the two SG200-50p units I have SPF port 50 on VLAN 2 (Actually 20 ) and ticked as [trunk] I have screen captures of the two ends of the link and both fibre ends are marked [trunk] I had figured that from what I had read, the document above made it very clear. I do not see ANY VLAN appearing on the far end, even though SW 2 port 50 is in VLAN 2 and marked as [trunk]. The interesting thing is if I unplug the other SPF transceiver then the link will come up and I can reach the equipment on VLAN 2 and also I get a DHCP assignment. As soon as I plug the other SPF into port 49, the link to VLAN 2 goes away, the SPF in port 49 connects to VLAN 1, and the connection is lost to VLAN 2 via SPF in port 50.
Wish I could attach the two screen captures here, so you can see what I have, you will probably see something that I am missing. On Sun, Aug 2, 2020 at 12:42 PM Mike C. <[email protected]> wrote: > > > > The two switches talk just fine between the two devices on > > VLAN 1. > > > > Yes, because the default / admin VLAN 1 is automagicaly extended across > switches for obvious reasons. > > > > But VLAN 2 will not talk. > > > VLANs are broadcast domains, and with the exception of the default/admin > VLAN 1, unless you extend the vlan broadcast domain intentionally, vlan > traffic stays local to the switch. > > > > > The interesting thing is that if Iunplug the SFP transceiver in port 49 > > (associated with VLAN 1) then VLAN 2 will start to talk to the other > switch > > over the SFP device in port 50. > > > > This is the Spanning Tree Protocol unlblockiing and finding a new route > after a link failure. > > > > I am assuming configuration somewhere but not sure where. > > > > Correct assumption. You need to configure a vlan trunk for VLAN 2 to > traverse the fiber links between the 2 switches, > > > https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/vlan/configuration_guide/b_vlan_3se_3850_cg/b_vlan_3se_3850_cg_chapter_0110.pdf > _______________________________________________ > PLUG: https://pdxlinux.org > PLUG mailing list > [email protected] > http://lists.pdxlinux.org/mailman/listinfo/plug > -- Chuck Hast -- KP4DJT -- I can do all things through Christ which strengtheneth me. Ph 4:13 KJV Todo lo puedo en Cristo que me fortalece. Fil 4:13 RVR1960 _______________________________________________ PLUG: https://pdxlinux.org PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
