# Monitoring Bridged Ethernet

You can:

- Display information about bridged Ethernet interfaces by using the show bridge1483 interface command.
- Monitor MAC address validation by using the show ip mac-validate interface command.
- Display information about VLANs configured on bridged Ethernet interfaces by using the show vlan subinterface command.

Bridged Ethernet interfaces are not bound to a specific virtual router (VR).

| Note: The E120 and E320 routers output for monitor and show commands is identical to output from other E Series routers, except that the E120 and E320 routers output also includes information about the adapter identifier in the interface specifier (slot/adapter/port).

show bridge1483 interface

- Use to display configuration and status information for all bridged Ethernet interfaces currently configured on the router.
- Use the atm keyword and an interface specifier to display information for a bridged Ethernet interface that is stacked over an ATM subinterface.
- Use the summary keyword to display only a count of all bridged Ethernet interfaces configured on the router.
- Field descriptions
  - Interface—Type and specifier of the lower-layer interface on which bridged Ethernet is configured
  - Status—Status of the bridged Ethernet interface: up, down, lowerLayerDown, notPresent
  - MAC Address—MAC address assigned to the bridged Ethernet interface, if configured
  - Type—Type of interface: static or dynamic
  - Oper/Admin MTU—Operational MTU, which is the MTU at which the interface actually operates, and administrative MTU, which is the MTU configured for the interface; the administrative MTU displays 1518 (the default value) if not configured
  - In—Analysis of inbound traffic on this interface
    - Bytes—Number of bytes received in error-free packets
    - Packets—Number of packets received
    - Multicast—Number of multicast packets received
    - Broadcast—Number of broadcast packets received
    - Errors—Total number of errors in all received packets; some packets might contain more than one error
    - Discards—Total number of discarded incoming packets
  - Out—Analysis of outbound traffic on this interface
    - Bytes—Number of bytes sent
    - Packets—Number of packets sent
    - Multicast—Number of multicast packets sent
    - Broadcast—Number of broadcast packets sent
    - Errors—Total number of errors in all transmitted packets; some packets might contain more than one error
    - Discards—Total number of discarded outgoing packets
  - ARP Statistics—Analysis of ARP traffic on this interface; In fields are for traffic received on the interface and Out fields are for traffic sent on the interface
    - ARP requests—Number of ARP requests
    - ARP responses—Number of ARP responses
    - Errors—Total number of errors in all ARP packets
    - Discards—Total number of discarded ARP packets
  - Total bridge1483 interfaces—Total number of bridged Ethernet interfaces configured on the router; this is the only information that appears when you specify the summary keyword
- Example 1—Displays full configuration and status information

      host1#show bridge1483 interface
                                                                  Oper/Admin
              Interface           Status    MAC Address    Type      MTU
      ------------------------- ---------- -------------- ------- ----------
      ATM 5/1.1                    Up       ----.----.---- Static  1500/1684
      ATM 5/1.2                    Up       ----.----.---- Static  8192/9188
      2 bridge1483 interfaces found

- Example 2—Displays full status and configuration information for the specified bridge1483 interface

      host1#show bridge1483 interface atm 12/0.1
                                                                  Oper/Admin
              Interface           Status    MAC Address    Type      MTU
      ------------------------- ---------- -------------- ------- ----------
      ATM 12/0.1                Up         ----.----.---- Static  1522/1522

        In: Bytes 0, Packets 0
         Multicast 0, Broadcast 0
         Errors 0, Discards 0
        Out: Bytes 0, Packets 0
         Multicast 0, Broadcast 0
         Errors 0, Discards 0
      ARP Statistics:
        In: ARP requests 0, ARP responses 0
         Errors 0, Discards 0
        Out: ARP requests 0, ARP responses 0
         Errors 0, Discards 0

- Example 3—Displays only brief summary information

      host1#show bridge1483 interface summary
      Total bridge1483 interfaces: 3

- See show bridge1483 interface.

show ip mac-validate interface

- Use to display the status of the MAC address validation on the physical interface.
- Field descriptions
  - interfaceSpecifier—Interface type slot/port
  - Keyword assigned to interface—Strict or Loose
  - Address—IP address of the entry
  - Hardware Addr—Physical (MAC) address of the entry
- Example

      host1:vr1#show ip mac-validate interface atm 8/0.1
      ATM8/0.1:  Strict

               Address     Hardware Addr
               180.1.0.2   0000.1111.2222

- See show ip mac-validate interface.

show vlan subinterface

- Use to display configuration and status information for a specified VLAN subinterface or for all VLAN subinterfaces configured on the router.
- Use the summary keyword to display only the counts of all VLAN subinterfaces and VLAN major interfaces configured on the router.
- Field descriptions
  - Interface—Type and specifier of the VLAN subinterface. For more information about specifying the ATM physical interface on which you want to configure the VLAN subinterface, see Interface Types and Specifiers in JunosE Command Reference Guide.
  - Status—Status of the VLAN subinterface: up, down, lowerLayerDown, notPresent
  - MTU—Maximum allowable size (in bytes) of the maximum transmission unit for the VLAN subinterface
  - Svlan Id—S-VLAN ID value, if configured
  - Vlan Id—VLAN ID value for the VLAN subinterface
  - Ethertype—S-VLAN Ethertype value, if configured
  - Total VLAN interfaces—Total numbers of VLAN subinterfaces and VLAN major interfaces configured on the router; this is the only field that appears when you specify the summary keyword
- Example 1—Displays full status and configuration information for all VLAN subinterfaces configured on the router

      host1#show vlan subinterface
              Interface           Status   MTU  Svlan Id Vlan Id  Ethertype
      ------------------------- ---------- ---- -------- -------- ---------
      ATM 3/0.1.2               Up         1522 ----     11       ----
      ATM 3/0.1.3               Up         1522 ----     12       ----
      ATM 3/1.1.1               Up         1522 ----     13       ----
      ATM 3/1.1.2               Up         1522 ----     14       ----
      ATM 3/2.1.1               Down       1526 4        255      0x9200
      FastEthernet 4/5.1        Up         1522 ----     1        ----
      6 vlan subinterfaces found

- Example 2—Displays full status and configuration information for the specified VLAN subinterface

      host1#show vlan subinterface atm 3/0.1.2
              Interface           Status   MTU  Svlan Id Vlan Id  Ethertype
      ------------------------- ---------- ---- -------- -------- ---------
      ATM 3/0.1.2               Up         1522 ----     11       ----

- Example 3—Displays only brief summary information for all VLAN subinterfaces configured on the router

      host1#show vlan subinterface summary
      Total VLAN interfaces: 6 subinterfaces, 3 major interfaces

- See show vlan subinterface.