[f-nsp] Spanning-tree event on single VLAN brings down LAG?

[frnkblk at iname.com]

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.

 

Frank 

 

From: George B <georgeb at gmail.com> 
Sent: Wednesday, October 10, 2018 1:13 PM
To: Frank Bulk <frnkblk at iname.com>
Subject: Re: [f-nsp] Spanning-tree event on single VLAN brings down LAG?

 

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?

 

 

On Wed, Oct 10, 2018, 09:59 Frank Bulk <frnkblk at iname.com <mailto:frnkblk at iname.com> > wrote:

We had network event deeper in our network that resulted in some kind of
spanning tree event as evidenced by a TC (topology change) on our L2-only
ICX6610 stack.  What surprised us was that one VLAN going into a blocking
state resulted in the south bound LAG going down.

This is probably not right, but the root bridge for VLAN 294 is on the
ICX6610 stack. VLAN 294 is on both LAGs (and no other port/LAG)

Three questions:
a) when a STP event occurs is it normal that a VLAN goes into Blocking on
all the ports where it is present?
b) when a VLAN goes into blocking should all the physical (or LAG) ports
associated with that VLAN go down?
c) does configuring spanning tree on the port-based VLAN but disabling
spanning-tree on the physical (or LAG) ports prevent the physical port (or
LAG) going down?

Frank

============================================================================
====
Oct  9 21:35:22 STP: VLAN 294 Port 1/3/6 Bridge TC Event (MakeBlking) 
Oct  9 21:35:22 STP: VLAN 294 Port 1/3/6 STP State -> BLOCKING (MakeBlking) 
Oct  9 21:35:25 System: Logical link on dynamic lag interface ethernet 2/3/8
is down. 
Oct  9 21:35:25 System: Logical link on dynamic lag interface ethernet 3/3/4
is down. 
Oct  9 21:35:26 System: Logical link on dynamic lag interface ethernet 3/3/8
is down. 
Oct  9 21:35:29 Trunk: Group (1/3/8, 2/3/8, 3/3/4, 3/3/8) removed by 802.3ad
link-aggregation module. 
Oct  9 21:35:29 STP: VLAN 4 Port 1/3/8 STP State -> BLOCKING (PortDown) 
Oct  9 21:35:29 STP: VLAN 4 Port 1/3/8 STP State -> DISABLED (PortDown)
etc.

 Event
   |
Transport
  | |   
  | |   (1/3/6 & 2/3/6)
  | |   
ICX6610 (L2)
 | | | |
 | | | | (1/3/8, 2/3/8, 3/3/4, 3/3/8)
 | | | |
Core (L3)



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