Hi Mary,

You might find it a better option to post on the forums; http://forums.networkinfrastructure.info/nortel-ethernet-switching/.

The easiest way to check would probably be with a packet trace of the traffic. You can setup a port mirror and then capture the data with WireShark or some other packet capture software and then look over the packets to make sure that they are marked, 802.1p / DiffServ, properly. You could also look at the packets at their egress points and make sure that their 802.1p or DiffServ tags were not modified from the time their ingressed the network.

Cheers!

I was searching some information about troubleshooting QoS on 8600 and 8300 devices. In fact, I have one 8600 with QoS configured ad vlan level connected to an 8300 with QoS configured at port level.

On the 8600 side I have only R modules but there are no filters configured.

I would just like to have a documentaion or something describing how I can do a monitoring for the 8600-8300 connection in order to see if and how QoS is working.

Thanks.

Best regtards,

Mary

The default timeout is 120 seconds (12000 [1/100 seconds]) for every port. If you set the timeout to 0 you would need to manually re-enable the port.

You can see the configuration with the following command, “show spanning-tree bpdu-filtering”.

Cheers!

The command seems to work. I have not tested it yet. Does it disable the port and if so, do I have to manually enable it?

thanks for all your help.

What version of software are you running? I believe a “show sys-info” will tell you from the CLI interface.

You’re probably running an older version of software that doesn’t support BPDU guard. I know it’s available in 6.1 software for sure.

Cheers!

when I type “spanning-tree ?”

bpdu-filtering is not a listed command option however the full syntax you supplied does indeed work.

Hi Greg,

Here’s an example;

config term
interface FastEthernet 1/1-5
spanning-tree learning fast
spanning-tree bpdu-filtering enable
exit

Good Luck!

what is the command syntax for BPDU guard on a 5520?

Hi Chuck,

I’m happy I was able to help. I’m guessing you didn’t have STP enabled on the edge ports of the switch?

You should disable STP on your core switch ports that feed your edge closet. You should disable STP on the uplinks ports out of the edge switch. You should make sure that STP is enabled (globally) on the edge switch and then enable STP on all the edge ports (ports that connect to users an not other switches).

You should also enable faststart to avoid the STP learning delay when the port first comes active.

You can also enable BPDU guard to protect against someone accidentally cabling two closet switches together.

You might want to reference this post.

You can also stop over at the forums and post any specific question or problem you might have.

Good Luck!