Ethernet Switches & Routers

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Contributor
pbeaven
Posts: 42
Registered: ‎10-14-2011

MSTP versus RSTP behavior issues?

I've got a brand new MLXE and I've setup RSTP for a few vlans and tested the response time by plugging a seperate switch into two ports in the same vlan.

The switch immediately disables on port, just like its supposed to.

I then setup mstp, my config below.

mstp name cross

mstp revision 2

mstp instance 1

mstp vlan 1001 to 1004

mstp start

I then connect the switch to two ports in the vlan and I see no spanning tree response! I see all ports forwarding traffic!

Is there a known issue with MST on the MLX or am i missing something. I have tried this several times with the same results.

I even made sure the little switch i connect to it does not support spanning-tree. I want to see predicatble behavior but i dont.

Does anyone have any Idea's?

Thanks,

Pat

Frequent Contributor
KarlM
Posts: 114
Registered: ‎07-26-2010

Re: MSTP versus RSTP behavior issues?

Hi Pat,

I am running MSTP successfully on MLX since 4 years.

What version are you using on your MLXE?

I am on 5000e.

>mstp name cross

>mstp revision 2

>mstp instance 1

>mstp vlan 1001 to 1004

>mstp start

start for you test with a simple instance 0 setup

mstp name cross

mstp revision 1

mstp admin-edge-port <your edge ports>

mstp start

With this cfg all configured VLANs will be in instance 0 by default.

Be sure that in global config "no spanning-tree" is in.

Or for a instance 1 cfg:

mstp name cross

mstp revision 1

mstp instance 1 vlan 1001 to 1004

mstp admin-edge-port <your edge ports>

mstp start

check with show mstp conf that things are configured and active.

Connect the ports again and check that higher port number shoulb be a "backup" port.

If it is not working, then comnnect a laptop to one of the ports and check with wireshark that you see MSTP BPDUs!

Hope this helps

Karl

Contributor
pbeaven
Posts: 42
Registered: ‎10-14-2011

Re: MSTP versus RSTP behavior issues?

I found the problem. I found that you have to run the no route-only command on a new MLX E switch this is what fixed the MSTP issue.

So just as a reminder anyone using MLX based equipment new must run this for switch config to actually enable for spanning-tree.

Contributor
pbeaven
Posts: 42
Registered: ‎10-14-2011

Re: MSTP versus RSTP behavior issues?

On MLX equipment you must run

"no route-only" when using and a switch/router to enable spanning-tree functions.

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