MSTP 2 VLan multiple uplink config

[madmax81]

UPDATE

Figured following out.

When I execute sh spanning-tree it figures out that Trk1 is in "forwarding" state on both switches. Trk2 is in "forwarding" state on switch B and in "blocking" state on switch A. Nevertheless Trk2 seems to forware because I can ping between the switches.

Why is that possible when on one switch the state is "blocking"?

Hi,

I have two HP switch with the configuration attached. There are 2 static VLans on each switch (default, cluster). Trk1 connects the Cluster VLan of the switches and Trk2 connects the default VLan between the switches. Trk3 on each switch connects to a third switch which contains the production Lan.

What I want to configure is that the uplinks Trk1 and Trk2 are forwarding simultaneously. Trk3 should be active either on Switch A or Switch B. The problem is, that I can't get Trk1 and Trk2 forwarding at the same time. Trk1 is forwarding and Trk2 always blocking.

Hope somebody can help.

Thank's in advance

Madmax

Running configuration:

; J9726A Configuration Editor; Created on release #WB.15.12.0010
; Ver #04:01.ff.35.0d:c2

hostname "SW1309SA"
module 1 type j9726a
trunk 3-4 trk1 trunk
trunk 5-6 trk2 trunk
trunk 23-24 trk3 lacp
time daylight-time-rule middle-europe-and-portugal
time timezone 1
ip default-gateway 10.160.248.3
snmp-server community "public" unrestricted
oobm
   ip address 10.160.0.6 255.255.0.0
   exit
vlan 1
   name "DEFAULT_VLAN"
   no untagged 1-2,Trk1
   untagged 7-22,A1-A2,B1-B2,Trk2-Trk3
   ip address 10.160.0.6 255.255.0.0
   exit
vlan 100
   name "Cluster"
   untagged 1-2,Trk1
   no ip address
   exit
spanning-tree
spanning-tree 1 admin-edge-port
spanning-tree 2 admin-edge-port
spanning-tree Trk1 admin-edge-port
spanning-tree Trk1 priority 4
spanning-tree Trk2 priority 4
spanning-tree Trk3 priority 4
spanning-tree config-name "Stadtwerke"
spanning-tree config-revision 1
spanning-tree instance ist 1 path-cost 20000
spanning-tree instance ist 2 path-cost 20000
spanning-tree instance ist Trk1 path-cost 20000
spanning-tree instance 1 vlan 1
spanning-tree instance 1 priority 0
spanning-tree instance 1 Trk1 priority 4
spanning-tree instance 1 Trk2 priority 0
spanning-tree instance 1 Trk3 priority 4
spanning-tree instance 2 vlan 100
spanning-tree instance 2 priority 0
spanning-tree instance 2 Trk1 priority 4
spanning-tree instance 2 Trk2 priority 4
spanning-tree instance 2 Trk3 priority 4
spanning-tree priority 1
password manager
password operator

Running configuration:

; J9726A Configuration Editor; Created on release #WB.15.12.0010
; Ver #04:01.ff.35.0d:c2

hostname "SW1309SB"
module 1 type j9726a
trunk 3-4 trk1 trunk
trunk 5-6 trk2 trunk
trunk 23-24 trk3 lacp
time daylight-time-rule middle-europe-and-portugal
time timezone 1
ip default-gateway 10.160.248.3
snmp-server community "public" unrestricted
oobm
   ip address 10.160.0.7 255.255.0.0
   exit
vlan 1
   name "DEFAULT_VLAN"
   no untagged 1-2,Trk1
   untagged 7-22,A1-A2,B1-B2,Trk2-Trk3
   ip address 10.160.0.7 255.255.0.0
   exit
vlan 100
   name "Cluster"
   untagged 1-2,Trk1
   no ip address
   exit
spanning-tree
spanning-tree 1 admin-edge-port
spanning-tree 2 admin-edge-port
spanning-tree Trk1 admin-edge-port
spanning-tree Trk1 priority 4
spanning-tree Trk2 priority 4
spanning-tree Trk3 priority 4
spanning-tree config-name "Stadtwerke"
spanning-tree config-revision 1
spanning-tree instance ist 1 path-cost 20000
spanning-tree instance ist 2 path-cost 20000
spanning-tree instance ist Trk1 path-cost 20000
spanning-tree instance 1 vlan 1
spanning-tree instance 1 Trk1 priority 4
spanning-tree instance 1 Trk2 priority 0
spanning-tree instance 1 Trk3 priority 4
spanning-tree instance 2 vlan 100
spanning-tree instance 2 Trk1 priority 4
spanning-tree instance 2 Trk2 priority 4
spanning-tree instance 2 Trk3 priority 4
spanning-tree priority 0
password manager
password operator

[Richard Brodie_1]

Quick question: how is the third switch configured? I haven't had more than a glance at the configuration but it will make a lot of difference.

[madmax81]

Hi!

The third switch is a Netgear. I don't have access to that but the customer gave me the information that spanning tree is enabled on it with default configuration.

[Richard Brodie_1]

 I would get rid of:

"spanning-tree Trk1 admin-edge-port", because it isn't an edge port.

Otherwise, your configuration looks fairly good to me. You just seem to have a slight misunderstanding of what is happening. You can't get Trk1 and Trk2 forwarding - in the same instance.

However, you already have multiple spanning trees configured. I think your configuration will work as it is.

You just need to do:

'show span instance  1' and

'show span instance  2' 

to confirm that the correct trunks are blocked.