# Monitoring the Status of MAC Address Validation on Physical Interfaces

#### Purpose

Displays the status of the MAC address validation on the physical interface.

#### Action

To display the status of the MAC address validation on the physical interface:

    host1:boston#show ip mac-validate interface fastEthernet 11/0
    FastEthernet11/0:  Strict

             Address     Hardware Addr
             3.3.3.3     0090.1a30.3365
             4.4.4.4     0090.1a30.3368

#### Meaning

Table 27 lists the show ip mac-validate interface fastEthernet command output fields.

Table 27: show ip mac-validate interface fastEthernet Output Fields

Field Name | Field Description
--- | ---
FastEthernet interfaceSpecifier | On the ERX14xx models, ERX7xx models, and ERX310 router, the Fast Ethernet or Gigabit Ethernet interface is of the format:slot/port; on the E120 and E320 routers, the Fast Ethernet, Gigabit Ethernet, or 10-Gigabit Ethernet interface is of the format: slot/adapter/port
Keyword assigned to interface | Type of MAC address validation configured on the interface. Possible values are: Strict—Prevents transmission of IP packets • that do not reside in the validation table Loose—Allows IP packets to pass through even though the packets do not have entries in the validation table; only packets that have matching IP–MAC pair entries in the table are validated; this is the default setting
Address | IP address of the entry
Hardware Addr | Physical (MAC) address of the entry

#### Related Documentation

- Configuring the Physical Interface
- show ip mac-validate interface