topic RE: No mac address showing for enabled and active port in ExtremeSwitching (EXOS/Switch Engine)

No mac address showing for enabled and active port

Miba89 — Mon, 08 Aug 2022 13:01:00 GMT

Dear Extreme,

One of the ports on our X450G2 stack is showing up as enabled and active. However when we want to see the mac address of this port, nothing is being listed?
How is this possible? How can we figure out the mac address of this port?

Slot-1 LANSTACK.45 # show port 2:13 no
Port Summary
Port Display VLAN Name Port Link Speed Duplex
# String (or # VLANs) State State Actual Actual
===========================================================================
2:13 PCs PCs E A 10 FULL
========================================================================

Slot-1 DCK-LANSTACK.47 # show fdb port 2:13
MAC VLAN Name( Tag) Age Flags Port / Virtual Port List
------------------------------------------------------------------------------------------------------

These are the details of our stack:

SysName: LANSTACK
System Type: X450G2-48p-10G4 (Stack)

SysHealth check: Enabled (Normal)
Recovery Mode: All
System Watchdog: Enabled

Slot: Slot-1 * Slot-2
------------------------ ------------------------
Current State: MASTER BACKUP (In Sync)

Image Selected: primary primary
Image Booted: primary primary
Primary ver: 30.7.1.1 30.7.1.1
patch1-103 patch1-103
Secondary ver: 30.7.1.1 30.7.1.1
patch1-103 patch1-103

Config Selected: primary.cfg
Config Booted: primary.cfg

RE: No mac address showing for enabled and active port

CThompsonEXOS — Mon, 08 Aug 2022 16:17:00 GMT

Hi,

"show ports 2:13 utilization" will show if that device is sending traffic. If it is not, then the switch will not learn a fdb. EXOS learns on the source mac:

ExtremeXOS® User Guide (extremenetworks.com)

Based on the auto negotiation being at "10", is it possible that device is asleep/dormant?

Thanks,
Chris Thompson

Basd

RE: No mac address showing for enabled and active port

Miba89 — Mon, 08 Aug 2022 18:35:00 GMT

Dear Christopher,

Thank you very much for the reply.

Using the "utilization" command shows me 0 packets received or 0 packets send. Which means the device is indeed either in sleep mode or dormant.

I'll ask someone to check physically.

Kind regards,
Michiel

RE: No mac address showing for enabled and active port

Brian_Anderson1 — Wed, 17 Aug 2022 17:26:00 GMT

I've seen this when the device has a static ip and is in the wrong vlan. Weird, but it happens.

RE: No mac address showing for enabled and active port

AdrianO — Thu, 25 Aug 2022 14:22:00 GMT

I´ve seen this when a PC has WoL enabled so it is listening for magic pkts but doesn´t generate any traffic.

RE: No mac address showing for enabled and active port

Miba89 — Thu, 25 Aug 2022 14:32:00 GMT

Thanks for the hint, Brian. I wasn't able to check physically yet, since other work came in between. But i'll keep that in mind.

RE: No mac address showing for enabled and active port

Miba89 — Thu, 25 Aug 2022 14:36:00 GMT

Good to know! Thanks Adrian. For now we didn't investigate any further and just disabled the ports (since we're working from remote). So far we haven't heard any complaints for 3 weeks now...

RE: No mac address showing for enabled and active port

FraserW — Fri, 26 Aug 2022 08:16:00 GMT

Log in to the core switch and find which port the specific MAC is found on. Then check the CDP neighbour table and identify what switch you have on that port.