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Old 04-07-2015, 12:41 PM
downs6 downs6 is offline
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Default STP blocking ports on MLT Server Side

Hello All!

I have been experiencing an issue i believe is a misconfiguration on the server side.
I have four MLTs created with two ports assigned to each on same range of vlans with a pvid of 566 (vlan 566 is configured on the interface).
Spanning tree is enabled on the mlt ports.
Each MLT connects to a server and is configured as an etherchannel on the server side.
Spanning Tree has set three of the four MLTs in a disabled state while the 4th MLT is in a forwarding state and functioning properly.

I believe that the bpdu packets are being traversed through the server side and arriving back at the switch MLT port interfaces and is setting blocking on the MLT ports.
The functioning MLT port state is showing learning but functioning properly.
The three non-functioning MLTs do not have mac addresses on the ports but show up/up on the show interfaces command.

This is a VSP7024XLS
HW:03 FW:10.1.0.6 SW:v10.1.0.001

NOTE: MLT 4,5,6,7 are the 4 MLTs in question

NON-OPERATIONAL CODE:
spanning-tree port 1-8,17-24 learning disable
mlt shutdown-ports-on-disable enable
mlt spanning-tree 2 stp 1 learning disable
mlt spanning-tree 3 stp 1 learning disable
OPERATIONAL CODE:
spanning-tree port 1-24 learning disable
mlt shutdown-ports-on-disable enable
mlt spanning-tree 2 stp 1 learning disable
mlt spanning-tree 3 stp 1 learning disable
mlt spanning-tree 4 stp 1 learning disable
mlt spanning-tree 5 stp 1 learning disable
mlt spanning-tree 6 stp 1 learning disable
mlt spanning-tree 7 stp 1 learning disable


If i disable spanning tree on the MLT ports, the MLTs work properly.

My question is. what is the normal operation of a MLT with spanning tree on the participating ports that are trunking to a server set for ether channel?

Thanks,
Mark
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