topic Re: BPDU Errors in ICX Switches

BPDU Errors

jay01 — Sun, 29 Oct 2023 19:36:34 GMT

Hi,

I have an ICX edge switch connected to Core using 802.1w. I need to uplink another extreme switch to the existing ICX edge switch.
Vlan 900 is configured on the extreme switch this vlan has configured with spanning-tree 802.1w and stp for point to point link to core on the ICX switch.Currently when RSTP enabled on extreme switch I am getting BPDU Errors:-

STP BPDU Drop messages flooding the logErro:STP.

InBPDU.Drop Port=24 ! STP Port is disabled!

Is there some additional configuration required on iCX switch to stop the BPDU errors ?

Re: BPDU Errors

Chandini — Mon, 30 Oct 2023 07:43:30 GMT

Hi Jay

Thank you for reaching us

Could you please help us with ICX switch model and firmware running on the switch ?
Also port 24 is it connected to uplink or end device ?
Is the BPDU drop message only received on port 24 when we check "show logging" from the switch CLI or are there other ports also that receive the same message in the switch logs ?

Also please check if this messages are causing high CPU on the switch by running "show CPU"

Thanks

Re: BPDU Errors

jay01 — Mon, 30 Oct 2023 20:47:55 GMT

Hi Chandini,

Could you please help us with ICX switch model and firmware running on the switch ?

ICX6450-48-HPOE/ICX64S08030h SW: Version 08.0.30hT311

Also port 24 is it connected to uplink or end device ?

Port 3/1/27 on ICX switch is uplinked to Extreme Switch port 24

Is the BPDU drop message only received on port 24 when we check "show logging" from the switch CLI or are there other ports also that receive the same message in the switch logs ?

only port 24 on Extreme Switch get the STP BPDU Drop messages

Can you confirm what spanning tree config is required on ICX Edge switch that is uplinked to another Edge Switch ?

CORE(802.1w 4076)--->ICX-EdgeSwitch (802.1w 32768)----Extreme EdgeSwitch(802.1w 32768)

Re: BPDU Errors

Chandini — Tue, 31 Oct 2023 08:17:30 GMT

Hi Jay

Thanks for reverting.

Below are the configuration details for RSTP which you can change or configure based on your network setup and requirement.

Below are the commands used:

Enable RSTP:
Device(config-vlan-2)# spanning-tree 802-1w

For defining priorities:
Device(config-vlan-2)# spanning-tree 802-1w priority 4096

Define port parameters/function:

End device connection:
Device(config-vlan-2)# spanning-tree 802-1w e 1/1/4 admin-edge-port

Switch to switch link:
Device(config-vlan-2)# spanning-tree 802-1w e 1/1/1 admin-pt2pt-mac

Please run through the below link reference which will help you understand more about the protocol and working with Ruckus devices.

Configuring RSTP:

https://docs.commscope.com/bundle/fastiron-08095-l2guide/page/GUID-A7C9E7F9-8349-4B09-82D5-A4AA81723673.html

Displaying information about 802-1w:

https://docs.commscope.com/bundle/fastiron-08095-l2guide/page/GUID-54C6B84D-FC89-4C0E-BE2B-EEA706706F94.html

All about 802.1W Rapid Spanning Tree (RSTP):

https://docs.commscope.com/bundle/fastiron-08095-l2guide/page/GUID-4061461B-3CBB-477B-B179-0A8611366B75.html

I hope these details help you

Thanks

Re: BPDU Errors

jay01 — Tue, 31 Oct 2023 20:31:25 GMT

Hi Chandini,

Thank you for configuration information.

I understand what needs to be configured between Core and Edge switch but I am still unclear what the correct config is connecting Edge to Edge when daisy chaining switches using a lag or just an access port.

Also what the difference between applying the admin-pt2pt-mac on a vlan as opposed to interface ?

Re: BPDU Errors

Chandini — Wed, 01 Nov 2023 16:43:36 GMT

Hi Jay

Thank you for reverting back to us.

Please prefer configuring admin-pt2pt-mac at the interface level between interfaces of the two switches. Below is the command.

Device(config)#int e 1/1/1
Device(config-if-e1000-1/1/1)#spanning-tree 802-1w admin-pt2pt-mac

Thanks

Re: BPDU Errors

jay01 — Wed, 01 Nov 2023 22:07:06 GMT

Hi Chandini,

What is the difference between configuring admin-pt2pt-mac on interface level compared with configuring under a vlan. Is that effectively like vlan pruning?

Say for example the ports where in a lag and tagged to lag20 under vlan 100. Can the pt2pt command be applied to both interface and under vlan 100 at the same time ?

Re: BPDU Errors

Chandini — Thu, 02 Nov 2023 18:00:47 GMT

Hi Jay

Thanks for reverting. I ran a quick test and below is the difference I could find.

Enabling admin-pt2pt-mac in interface:
ICX7150-48PF Router(config-if-e1000-1/1/1)#spanning-tree 802-1w
admin-edge-port Declare the port to be an operational edge for all vlans
admin-pt2pt-mac Declare the port to be on a Pt2Pt link for all vlans

Enabling admin-pt2pt-mac in vlan:
ICX7150-48PF Router(config-vlan-2)#spanning-tree 802-1w e 1/1/1 admin-pt2pt-mac
admin-edge-port Declare the port to be an operational edge
admin-pt2pt-mac Declare the port to be on a Point-to-Point link

Example :

When admin-pt2pt-mac is enabled in interface level:

When admin-pt2pt-mac is enabled in vlan level:

From above two examples you can note on the difference that when enabled in vlan you can see only P2P Mac counter for vlan 200 only enabled as True applying only to that vlan. Whereas when enabled on interface level you can note that the P2P Mac counter for vlan 200 and vlan 300 is enabled as True.

Hence when enabled on interface level the port is recognized as a point to point link for all vlans where the port is mapped as tagged or untagged interface. And when enabled on vlan alone it is recognized only by that vlan as point to point interface based on above test.

Hence it is recommended to enable admin-pt2pt-mac on a interface rather than a vlan.

I hope this answers your question.

Thanks

Re: BPDU Errors

jay01 — Thu, 02 Nov 2023 21:59:44 GMT

Hi Chandini,

Thank for response. Yes the switch configuration I have has STP configured on vlans not sure of the reason but I only have worked with Cisco.

Do you by chance have sample config of a Core switch with RSTP configured and one for Edge switch please ? It will provide me with a template?

Re: BPDU Errors

Chandini — Fri, 03 Nov 2023 12:37:09 GMT

Hi Jay

Thank you for reaching. Sorry but I don't have a template but below is a example. I hope this helps.

Topology :

Core Switch p2p connection (1/1/1) -> p2p connection (1/1/1) Access Switch (1/1/2) -> end device
Consider both switches have vlan 1 , vlan 2 and vlan 3
1/1/2 is end device part of vlan 3 only

If above scenario is considered below would be the configuration:

For core switch:

Vlan configuration:

Device(config)#vlan 1 2 3
Device(config-mvlan-1-3)#spanning-tree 802-1w
Device(config-mvlan-1-3)# spanning-tree 802-1w priority 4096 // note this priority you can consider based on your network topology
Device(config)#vlan 2 3
Device(config-mvlan-2-3)#tagged e 1/1/1

Port configuration:

Device(config)#int e 1/1/1
Device(config-if-e1000-1/1/1)#spanning-tree 802-1w admin-pt2pt-mac

For access switch:

Access(config)#vlan 1 2 3
Access(config-mvlan-1-3)#spanning-tree 802-1w
Access(config)#vlan 2 3
Access(config-mvlan-2-3)#tagged e 1/1/1
Access(config)#vlan 3
Access(config-vlan-3)# untagged e 1/1/2

Port configuration:

Access(config)#int e 1/1/1
Access(config-if-e1000-1/1/1)#spanning-tree 802-1w admin-pt2pt-mac
Access(config)#int e 1/1/2
Access(config-if-e1000-1/1/2)#spanning-tree 802-1w admin-edge-port

I hope the above details help you

Thanks