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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>No, that VLAN is tagged on that port. We’re running plain STP on the stack; transport doesn’t use STP, but based on PBB-TE.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Frank <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b>From:</b> George B <georgeb@gmail.com> <br><b>Sent:</b> Wednesday, October 10, 2018 1:13 PM<br><b>To:</b> Frank Bulk <frnkblk@iname.com><br><b>Subject:</b> Re: [f-nsp] Spanning-tree event on single VLAN brings down LAG?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Is that VLAN untagged on that port? Looks to me like it blocked LACP packets. What type of spanning tree is running on the stack and the transport device?<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Wed, Oct 10, 2018, 09:59 Frank Bulk <<a href="mailto:frnkblk@iname.com">frnkblk@iname.com</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal>We had network event deeper in our network that resulted in some kind of<br>spanning tree event as evidenced by a TC (topology change) on our L2-only<br>ICX6610 stack. What surprised us was that one VLAN going into a blocking<br>state resulted in the south bound LAG going down.<br><br>This is probably not right, but the root bridge for VLAN 294 is on the<br>ICX6610 stack. VLAN 294 is on both LAGs (and no other port/LAG)<br><br>Three questions:<br>a) when a STP event occurs is it normal that a VLAN goes into Blocking on<br>all the ports where it is present?<br>b) when a VLAN goes into blocking should all the physical (or LAG) ports<br>associated with that VLAN go down?<br>c) does configuring spanning tree on the port-based VLAN but disabling<br>spanning-tree on the physical (or LAG) ports prevent the physical port (or<br>LAG) going down?<br><br>Frank<br><br>============================================================================<br>====<br>Oct 9 21:35:22 STP: VLAN 294 Port 1/3/6 Bridge TC Event (MakeBlking) <br>Oct 9 21:35:22 STP: VLAN 294 Port 1/3/6 STP State -> BLOCKING (MakeBlking) <br>Oct 9 21:35:25 System: Logical link on dynamic lag interface ethernet 2/3/8<br>is down. <br>Oct 9 21:35:25 System: Logical link on dynamic lag interface ethernet 3/3/4<br>is down. <br>Oct 9 21:35:26 System: Logical link on dynamic lag interface ethernet 3/3/8<br>is down. <br>Oct 9 21:35:29 Trunk: Group (1/3/8, 2/3/8, 3/3/4, 3/3/8) removed by 802.3ad<br>link-aggregation module. <br>Oct 9 21:35:29 STP: VLAN 4 Port 1/3/8 STP State -> BLOCKING (PortDown) <br>Oct 9 21:35:29 STP: VLAN 4 Port 1/3/8 STP State -> DISABLED (PortDown)<br>etc.<br><br> Event<br> |<br>Transport<br> | | <br> | | (1/3/6 & 2/3/6)<br> | | <br>ICX6610 (L2)<br> | | | |<br> | | | | (1/3/8, 2/3/8, 3/3/4, 3/3/8)<br> | | | |<br>Core (L3)<br><br><br><br>_______________________________________________<br>foundry-nsp mailing list<br><a href="mailto:foundry-nsp@puck.nether.net" target="_blank">foundry-nsp@puck.nether.net</a><br><a href="http://puck.nether.net/mailman/listinfo/foundry-nsp" target="_blank">http://puck.nether.net/mailman/listinfo/foundry-nsp</a><o:p></o:p></p></blockquote></div></div></body></html>