Ethernet Switches & Routers

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Occasional Contributor
Posts: 17
Registered: ‎02-11-2013

802.1w issue on SX's

I have 2 foundry devices running 802.1w which are both connected to an access switch which also runs 802.1w.

The 2 foundry's are connected to each as well.

I have the vlan configured on each of the devices to participate in spanning tree however when I add the tag/trunk ports to the vlan, the end devices configured on the access switch lose connectivity. As soon as I remove the tagged ports from the vlan either on switchA or switchB, the connectivity gets restored.

It's not making much sense to me why it doesn't work when the tagged ports are added to the vlans.

SwitchA vlan config:

vlan 16 by port                                       
 tagged ethe 2/1 ethe 8/21 to 8/22                                
 router-interface ve 16                                           
 spanning-tree 802-1w                                             
 spanning-tree 802-1w priority 4096

SwitchB vlan config:

vlan 16 by port
 tagged ethe 2/2 ethe 5/1 to 5/2
 router-interface ve 16
 spanning-tree 802-1w
 spanning-tree 802-1w priority 8192

This is the output from SwitchA:

Port IEEE 802.1W Parameters:

       <--- Config Params --><-------------- Current state -----------------> 
Port   Pri PortPath P2P Edge Role       State       Designa-  Designated       
Num        Cost     Mac Port                        ted cost  bridge           
2/1    128 200000   F   F    DESIGNATED FORWARDING  0         10000012f21e880f 
8/21   128 20000    T   F    DESIGNATED FORWARDING  0         10000012f21e880f 
8/22   128 20000    T   F    DESIGNATED FORWARDING  0         10000012f21e880f

This is the output from SwitchB:

      <--- Config Params -->|<------------- Current state ------------------->
Port  Pri PortPath  P2P Edge Role       State       Designa-  Designated       
Num       Cost      Mac Port                        ted cost  bridge           
2/2   128 200000    F   F    ALTERNATE       DISCARDING  19        f010001380fa0480 
5/1   128 20000    T   F    DESIGNATED FORWARDING  0         f010001380fa0480 
5/2   128 20000    T   F    DESIGNATED FORWARDING  0         f010001380fa0480

Now with the config like this, connectivity is lost. When I remove either the 5/1-5/2 or the 8/21-8/22 from either switch, connectivity gets restored.

The access switch down below has the following:

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/18              Desg FWD 19        128.18   P2p 
Fa0/46              Desg FWD 19        128.46   P2p 
Fa0/47              Root FWD 19        128.47   P2p 
Fa0/48              Desg FWD 19        128.48   P2p 

Ports 47+48 are the uplinks ports going to the foundry's and 18+46 are going to end user equipment.

This doesn't make sense to me why this happens.

Anyone have an explanation or a fix for this?

Thanks

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