topic Re: mac address lookup in ExtremeSwitching (EXOS/Switch Engine)

mac address lookup

scifan2k — Mon, 14 Aug 2023 14:15:08 GMT

I am finding it difficult to locate mac addresses for PC's and Printers when they are not assigned to a particular VLAN. When I run the cmd show fdp (mac address), nothing shows. I have deleted all ports from the default vlan. I do have the ports on a VOIP vlan also so I can find the mac for the phone but I am unable to find the mac of the other devices. The switches are Extreme 5420's running EXOS. Any ideas?

Re: mac address lookup

treese — Tue, 15 Aug 2023 12:43:45 GMT

You may take a look at the fdb detail:

# Module fdb configuration.
#
configure fdb agingtime 300
configure iparp max_entries 12288
configure iparp max_pending_entries 256
configure iparp max_proxy_entries 256
configure iparp vr VR-Default timeout 20
configure iparp vr VR-Default locktime 1000
configure iparp retransmit-time 1000 milliseconds
configure iparp reachable-time auto
enable iparp vr VR-Default checking
enable iparp vr VR-Default refresh
disable learning iparp vr VR-Default sender-mac
configure iparp vr VR-Default fast-convergence off
configure iparp vr VR-Mgmt timeout 20
configure iparp vr VR-Mgmt locktime 1000
configure iparp retransmit-time 1000 milliseconds
configure iparp reachable-time auto
enable iparp vr VR-Mgmt checking
enable iparp vr VR-Mgmt refresh
disable learning iparp vr VR-Mgmt sender-mac
configure iparp vr VR-Mgmt fast-convergence off
configure neighbor-discovery max_entries 8192
configure neighbor-discovery max_pending_entries 1024
configure neighbor-discovery vr VR-Default timeout 20
configure neighbor-discovery cache vr VR-Default locktime 1000
configure neighbor-discovery retransmit-time 1000 milliseconds
configure neighbor-discovery reachable-time auto
enable neighbor-discovery vr VR-Default refresh
configure neighbor-discovery vr VR-Mgmt timeout 20
configure neighbor-discovery cache vr VR-Mgmt locktime 1000
configure neighbor-discovery retransmit-time 1000 milliseconds
configure neighbor-discovery reachable-time auto
enable neighbor-discovery vr VR-Mgmt refresh
disable snmp traps fdb mac-tracking
configure fdb mac-tracking del ports all
disable fdb static-mac-move notification
configure fdb static-mac-move packets 2
disable mac-locking

You may see something that needs to be enabled or disabled

Re: mac address lookup

treese — Tue, 15 Aug 2023 12:44:28 GMT

Extreme Networks Switch Engine version 31.7.1.4 by release-manager

Re: mac address lookup

treese — Tue, 15 Aug 2023 12:45:59 GMT

Run the same command for the vlan config - show configuration detail vlan

Re: mac address lookup

scifan2k — Tue, 15 Aug 2023 14:49:39 GMT

Here is my configuration, do you notice anything?

configure fdb agingtime 300
configure iparp max_entries 12288
configure iparp max_pending_entries 256
configure iparp max_proxy_entries 256
configure iparp vr VR-Default timeout 20
configure iparp vr VR-Default locktime 1000
configure iparp retransmit-time 1000 milliseconds
configure iparp reachable-time auto
enable iparp vr VR-Default checking
enable iparp vr VR-Default refresh
disable learning iparp vr VR-Default sender-mac
configure iparp vr VR-Default fast-convergence off
configure iparp vr VR-Mgmt timeout 20
configure iparp vr VR-Mgmt locktime 1000
configure iparp retransmit-time 1000 milliseconds
configure iparp reachable-time auto
enable iparp vr VR-Mgmt checking
enable iparp vr VR-Mgmt refresh
disable learning iparp vr VR-Mgmt sender-mac
configure iparp vr VR-Mgmt fast-convergence off
configure neighbor-discovery max_entries 8192
configure neighbor-discovery max_pending_entries 1024
configure neighbor-discovery vr VR-Default timeout 20
configure neighbor-discovery cache vr VR-Default locktime 1000
configure neighbor-discovery retransmit-time 1000 milliseconds
configure neighbor-discovery reachable-time auto
enable neighbor-discovery vr VR-Default refresh
configure neighbor-discovery vr VR-Mgmt timeout 20
configure neighbor-discovery cache vr VR-Mgmt locktime 1000
configure neighbor-discovery retransmit-time 1000 milliseconds
configure neighbor-discovery reachable-time auto
enable neighbor-discovery vr VR-Mgmt refresh
disable snmp traps fdb mac-tracking
configure fdb mac-tracking del ports all
disable fdb static-mac-move notification
configure fdb static-mac-move packets 2
disable mac-locking

Re: mac address lookup

scifan2k — Tue, 15 Aug 2023 14:55:03 GMT

Image : Extreme Networks Switch Engine version 31.7.1.4 31.7.1.4-patch1-98 by release-manager

Re: mac address lookup

scifan2k — Wed, 16 Aug 2023 18:43:45 GMT

I spoke with someone at GTAC and they informed me, there is no way to find a mac if it is not associated to a VLAN

Re: mac address lookup

marykline — Mon, 08 Dec 2025 07:41:31 GMT

@moviebox On EXOS switches, MAC addresses won’t populate in the FDB unless the device is actively passing traffic on that VLAN, so if the PC or printer isn’t generating traffic and isn’t a member of any data VLAN, the MAC simply won’t show up. Since you’ve removed ports from the default VLAN and only have VOIP configured, the switch only learns the phone MACs. Try temporarily adding the access ports back to a data VLAN and generate traffic, then run `show` or `show mac-address-table` again. Also, checking the official Extreme documentation online through the provided URL can help confirm the exact command for the 5420 series.