show mac-lockdown-timeout fdb ports

show mac-lockdown-timeout fdb ports [all | port_list]


Displays the MAC entries that are learned on the specified port or group of ports or for all ports on the switch along with the aging time of each port.

Syntax Description

all Specifies all ports
port_list Specifies one or more ports or slots and ports.



Usage Guidelines

If a port is down, the command displays all of the MAC entries that are maintained locally in the software.

The MAC entries learned on the specified port are displayed only if the MAC lock down timeout feature is enabled on the port. If you specify a port on which this feature is disabled, the MAC entries learned on that port are not displayed.

The switch displays the following information:
  • Mac—The MAC address that defines the entry.

  • Vlan—The VLAN name and ID for the entry.

  • Age—The age of the entry, in seconds.

  • Flags—Flags that define the type of entry:
    • B—Egress Blackhole.

    • b—Ingress Blackhole.

    • F—Entry in the hardware FDB.

    • L—Entry in the software.

  • Port—The port on which the MAC address has been learned.


The following command displays information about the MAC address lock down timeout settings for ports 2:3 and 2:4:

show mac-lockdown-timeout fdb ports 2:3, 2:4

The following is sample output from this command:

Mac                     Vlan       Age  Flags  Port
00:00:01:00:00:02v1(4094)0030FB b2:3
Flags : (F) Entry as in h/w FDB, (L) Entry in s/w and not in h/w
(B) Egress Blackhole, (b) Ingress Blackhole
Total: 4 Entries in FDB: 3Entries in s/w: 1


This command was first available in ExtremeXOS 11.6.

Platform Availability

This command is available on ExtremeSwitching 5320, 5420, 5520, and 5720 series switches.