Step 3: Display Extensive Status Information for
a Specific Fast Ethernet or Gigabit Ethernet Interface

Action

To display extensive status information about a specific Fast Ethernet or Gigabit Ethernet interface, use the following JUNOS CLI operational mode command:

user@host> show interfaces (fe-fpc/pic/port | ge-fpc/pic/port) extensive

Sample Output

The following sample output is for a Fast Ethernet interface:

user@router> show interfaces fe-1/3/3 extensive

Physical interface: fe-1/3/3, Enabled, Physical link is Up

  Interface index: 47, SNMP ifIndex: 38

  Description: Test

  Link-level type: Ethernet, MTU: 1514, Source filtering: Disabled

  Speed: 100mbps, Loopback: Disabled, Flow control: Enabled

  Device flags   : Present Running

  Interface flags: SNMP-Traps

  Link flags     : None

  Current address: 00:90:69:8d:2c:de, Hardware address: 00:90:69:8d:2c:de

  Statistics last cleared: 2002-01-11 23:03:09 UTC (1w2d 23:54 ago)

  Traffic statistics:

   Input  bytes  :            373012658                    0 bps

   Output bytes  :            153026154                 1392 bps

   Input  packets:              1362858                    0 pps

   Output packets:              1642918                    3 pps

  Input errors:

    Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Policed discards: 503660

    L3 incompletes: 1, L2 channel errors: 0, L2 mismatch timeouts: 0

    FIFO errors: 0

  Output errors:

    Carrier transitions: 0, Errors: 0, Collisions: 0, Drops: 0, Aged packets: 0

    HS link CRC errors: 0, FIFO errors: 0

  Active alarms  : None

  Active defects : None

  MAC statistics:                      Receive         Transmit

    Total octets                     439703575        177452093

    Total packets                      1866532          1642916

    Unicast packets                     972137          1602563

    Broadcast packets                       30             2980

    Multicast packets                   894365            37373

    CRC/Align errors                         0                0

    FIFO errors                              0                0

    MAC control frames                       0                0

    MAC pause frames                         0                0

    Oversized frames                         0

    Jabber frames                            0

    Fragment frames                          0

    VLAN tagged frames                       0

    Code violations                          0

  Filter statistics:

    Input packet count                 1866532

    Input packet rejects                     0

    Input DA rejects                    503674

    Input SA rejects                         0

    Output packet count                                 1642916

    Output packet pad count                                   0

    Output packet error count                                 0

    CAM destination filters: 5, CAM source filters: 0

  Autonegotiation information:

    Negotiation status: Complete, Link partner status: OK

    Link partner: Full-duplex, Flow control: None

  PFE configuration:

    Destination slot: 1, Stream number: 15

    CoS transmit queue bandwidth:

      Queue0: 95, Queue1: 0, Queue2: 0, Queue3: 5

    CoS weighted round-robin:

      Queue0: 95, Queue1: 0, Queue2: 0, Queue3: 5

  Logical interface fe-1/3/3.0 (Index 8) (SNMP ifIndex 69)

    Description: Test

    Flags: SNMP-Traps, Encapsulation: ENET2

    Protocol inet, MTU: 1500, Flags: None

      Addresses, Flags: Is-Preferred Is-Primary

        Destination: 10.115.107.192/29, Local: 10.115.107.193

        Broadcast: 10.115.107.199

What It Means

The sample output shows where the errors might be occurring and includes autonegotiation information. See Table 39 for a description of errors to look for.

Table 39: Errors to Look For

Error	Meaning
Policed discards	Discarded frames that were not recognized or were not of interest, for example, Cisco Discovery Protocol (CDP) packets.
L2 channel errors	Packets for which the router could not find a valid logical interface. For example, the packet is for a virtual LAN (VLAN) that is not configured on the interface.
MTU	The maximum transmission unit (MTU) must match the interface of either the router at the remote end of the Fast Ethernet or Gigabit Ethernet link, or that of the switch.
Input DA rejects	Number of packets with a destination Media Access Control (MAC) address that is not on the accept list. It is normal to see this number increment.
Input SA rejects	Number of packets with a source MAC address that is not on the accept list. This number only increments when source MAC address filtering is configured.

If the physical link is down, look at the active alarms and defects for the Fast Ethernet or Gigabit Ethernet interface and diagnose the Fast Ethernet or Gigabit Ethernet media accordingly. See Locate the Fast Ethernet and Gigabit Ethernet LINK Alarm and Counters for an explanation of Fast Ethernet and Gigabit Ethernet alarms.

Table 40 lists and describes some MAC statistics errors to look for.

Table 40: MAC Statistics Errors

Error	Meaning
CRC/Align errors	The total number of packets received that had a length (excluding framing bits, but including FCS octets) of between 64 and 1518 octets, inclusive, but had either a bad FCS with an integral number of octets (FCS Error) or a bad FCS with a non-integral number of octets (Alignment Error).
MAC control frames	The number of MAC control frames.
MAC pause frames	The number of MAC control frames with pause operational code.
Jabber frames	The total number of packets received that were longer than 1518 octets (excluding framing bits, but including FCS octets), and had either an FCS error or an alignment error. Note that this definition of jabber is different from the definition in IEEE-802.3 section 8.2.1.5 (10BASE5) and section 10.3.1.4 (10BASE2). These documents define jabber as the condition where any packet exceeds 20 ms. The allowed range to detect jabber is between 20 ms and 150 ms.
Fragment frames	The total number of packets received that were less than 64 octets in length (excluding framing bits, but including FCS octets), and had either an FCS error an alignment error. Note that it is entirely normal for fragment frames to increment because both runts (which are normal occurrences due to collisions) and noise hits are counted.

Autonegotiation is the process that connected Ethernet interfaces use to communicate the information necessary to interoperate. Table 41 explains the autonegotiation information of the show interface interface-name extensive command output.

Table 41: Autonegotiation Information

Autonegotiation Field Information	Explanation
Negotiation status: Incomplete	The Negotiation status field shows Incomplete when the Ethernet interface has the speed or link mode configured.
Negotiation status: No autonegotiation	The Negotiation status field shows No autonegotiation when the remote Ethernet interface has the speed or link mode configured, or does not perform autonegotiation.
Negotiation status: Complete Link partner status: OK	The Negotiation status field shows Complete and the Link partner field shows OK when the Ethernet interface is connected to a device that performs autonegotiation and the autonegotiation process completes successfully.
Link partner: Half-duplex	The Link partner field can be Full-duplex or Half-duplex depending on the capability of the attached Ethernet device.
Flow control: Symmetric/asymmetric	The Flow control field displays the types of flow control supported by the remote Ethernet device.