Monitoring Fast Ethernet And Gigabit Ethernet Interfaces | Junos OS

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  • Checklist to Monitor Fast Ethernet and Gigabit Ethernet Interfaces

  • How to Monitor Fast Ethernet and Gigabit Ethernet Interfaces

  • Fiber-Optic Ethernet Interface Specifications

  Monitor Fast Ethernet and Gigabit Ethernet Interfaces

SUMMARY Learn how to effectively monitor Fast Ethernet and Gigabit Ethernet interfaces by following a comprehensive checklist, understanding key monitoring techniques, and reviewing fiber-optic Ethernet interface specifications.

Checklist to Monitor Fast Ethernet and Gigabit Ethernet Interfaces

  • Purpose
  • Action
  • Meaning

Purpose

To monitor Fast Ethernet and Gigabit Ethernet interfaces and interface problems.

Action

It provides links and commands for monitoring Fast Ethernet and Gigabit Ethernet interfaces.

Table 1: Monitor Fast Ethernet and Gigabit Ethernet Interfaces

Tasks

Command or Action
Monitor Fast Ethernet and Gigabit Ethernet Interfaces

Display the Status of Fast and Gigabit Ethernet Interfaces

show interfaces terse (fe* | ge*)

Display the Status of Specific Fast and Gigabit Ethernet Interface

show interfaces (fe-fpc/pic/port | ge-fpc/pic/port)

Display Extensive Status for a Specific Fast Ethernet or Gigabit Ethernet Interface

show interfaces (fe-fpc/pic/port | ge-fpc/pic/port) extensive

Monitor Statistics for a Fast Ethernet or Gigabit Ethernet Interface

monitor interface (fe-fpc/pic/port | ge-fpc/pic/port)

Meaning

You can use the commands to monitor and to display the configurations for Fast Ethernet and Gigabit Ethernet interfaces.

How to Monitor Fast Ethernet and Gigabit Ethernet Interfaces

Monitor the Fast Ethernet and Gigabit Ethernet interfaces to isolate interfaces related problems.

To monitor your Fast Ethernet and Gigabit Ethernet interfaces, follow these steps:

  • Display the Status of Fast and Gigabit Ethernet Interfaces
  • Display the Status of Gigabit Ethernet Interfaces
  • Display the Status of a Specific Fast Ethernet and Gigabit Ethernet Interface
  • Display Extensive Status for a Specific Fast Ethernet or Gigabit Ethernet Interface
  • Monitor Statistics for a Fast Ethernet or Gigabit Ethernet Interface

Display the Status of Fast and Gigabit Ethernet Interfaces

  • Purpose
  • Action
  • Meaning

Purpose

To display the status of Fast and Gigabit Ethernet interfaces, use the following Junos OS command-line interface (CLI) operational mode command:

Action

user@host> show interfaces terse (fe* | ge*)
Sample Output
user@host> show interfaces terse fe* Interface Admin Link Proto Local Remote fe-2/1/0 up up fe-2/1/0.0 up up inet 10.116.115.217/29 fe-3/0/2 up down fe-3/0/2.0      up down fe-3/0/3 up up fe-3/0/3.0 up up inet 192.168.223.65/30 fe-4/1/0        down  up fe-4/1/0.0 up down inet 10.150.59.133/30 fe-4/1/1 up up fe-4/1/1.0 up up inet 10.150.59.129/30 fe-4/1/2 up down fe-4/1/2.0      up    down

Meaning

The sample output lists only the Fast and Gigabit Ethernet interfaces. It shows the status of both the physical and logical interfaces.

Table 2: Fast and Gigabit Ethernet Interfaces Status

Physical Interface

Logical Interface

Status Description

fe-2/1/0

Admin Up

Link Up

fe-2/1/0.0

Admin Up

Link Up

This interface has both the physical and logical links up and running.

fe-3/0/2

Admin Up

Link Down

fe-3/0/2.0

Admin Up

Link Down

This interface has the physical link down, the link layer down, or both down (Link Down). The logical link is also down as a result.

fe-4/1/0

Admin Down

Link Up

fe-4/1/0.0

Admin Up

Link Down

This interface is administratively disabled and the physical link is healthy (Link Up), but the logical interface is not established. The logical interface is down because the physical link is disabled.

fe-4/1/2

Admin Up

Link Down

fe-4/1/2.0

Admin Up

Link Down

This interface has both the physical and logical links down.

Display the Status of Gigabit Ethernet Interfaces

  • Purpose
  • Action
  • Meaning

Purpose

To display the status of Gigabit Ethernet interfaces, use the following Junos OS command-line interface (CLI) operational mode command:

Action

user@host> show interfaces terse ge* Interface Admin Link Proto Local Remote ge-2/2/0 down down ge-2/2/0.0 up down inet 65.113.23.105/30 ge-2/3/0 up up ge-2/3/0.0 up up inet 65.115.56.57/30 ge-3/1/0 up up ge-3/1/0.0 up up inet 65.115.56.193/30 ge-3/2/0 up down

Meaning

This sample output lists only the Gigabit Ethernet interfaces. It shows the status of both the physical and logical interfaces. See Table 3 for a description of what the output means.

Table 3: Status of Gigabit Ethernet Interfaces

Physical Interface

Logical Interface

Status Description

ge-2/2/0

Admin Down

Link Down

ge-2/2/0.0

Admin Up

Link Down

This interface is administratively disabled (Admin Down). Both the physical and logical links are down (Link Down).

ge-2/3/0

Admin Up

Link Up

ge-2/3/0.0

Admin Up

Link Up

This interface has both the physical and logical links up and running.

ge-3/2/0

Admin Up

Link Down

ge-3/2/0.0

Admin Up

Link Down

This interface has both the physical link and the logical interface down.

Display the Status of a Specific Fast Ethernet and Gigabit Ethernet Interface

  • Purpose
  • Action
  • Meaning

Purpose

To investigate the status of a specific Ethernet interface, use the following CLI command to view its details:

Action

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

Sample Output 1

The following sample output is for a Fast Ethernet interface with the physical link up:

user@host> show interfaces fe-2/1/0 Physical interface: fe-2/1/0, Enabled, Physical link is Up Interface index: 31, SNMP ifIndex: 35 Description: customer connection 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: 00:90:69:86:71:1b, Hardware address: 00:90:69:86:71:1b Input rate : 25768 bps (11 pps), Output rate: 1576 bps (3 pps) Active alarms : None Active defects : None Logical interface fe-2/1/0.0 (Index 2) (SNMP ifIndex 43) Flags: SNMP-Traps, Encapsulation: ENET2 Protocol inet, MTU: 1500, Flags: Is-Primary Addresses, Flags: Is-Preferred Is-Primary Destination: 10.116.151.218/29, Local: 10.119.115.217 Broadcast: 10.116.151.225

Sample Output 2

The following output is for a Gigabit Ethernet interface with the physical link up:

user@host> show interfaces ge-3/1/0 Physical interface: ge-3/1/0, Enabled, Physical link is Up Interface index: 41, SNMP ifIndex: 55 Description: customer connection Link-level type: Ethernet, MTU: 1514, Source filtering: Disabled Speed: 1000mbps, Loopback: Disabled, Flow control: Enabled Device flags : Present Running Interface flags: SNMP-Traps Link flags : None Current address: 00:90:69:85:71:99, Hardware address: 00:90:69:85:71:99 Input rate : 7412216 bps (1614 pps), Output rate: 2431184 bps (1776 pps) Active alarms : None Active defects : None Logical interface ge-3/1/0.0 (Index 11) (SNMP ifIndex 57) Flags: SNMP-Traps, Encapsulation: ENET2 Protocol inet, MTU: 1500 Addresses, Flags: Is-Preferred Is-Primary Destination: 10.117.65.192/30, Local: 10.115.65.193 Broadcast: 10.115.65.195

Meaning

The first line of sample output 1 and 2 shows that the physical link is up, indicating that it is healthy and can pass packets. Scroll through the output to check for any active alarms or defects. If alarms or defects are present, refer to Display Extensive Status Information for a Specific Fast Ethernet or Gigabit Ethernet Interface, for more detailed diagnostic information about the interface. 

Display Extensive Status for a Specific Fast Ethernet or Gigabit Ethernet Interface

  • Purpose
  • Action
  • Meaning

Purpose

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

Action

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

Meaning

The sample output shows where the errors might be occurring and includes autonegotiation information.

Table 4: Errors and their Meaning

Error

Meaning

Policed discards

Discarded frames that were not recognized or were not of interest.

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 LINK Alarms and Counters for Fast and Gigabit Ethernet for an explanation of Fast Ethernet and Gigabit Ethernet alarms.

Table 5: 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 6 explains the autonegotiation information of the show interface interface-name extensive command output.

Table 6: Autonegotiation Field Information

Autonegotiation Field Information

Explanation

Negotiation status: Incomplete

Ethernet interface has the speed or link mode configured.

Negotiation status: No autonegotiation

Ethernet interface has the speed or link mode configured, or does not perform autonegotiation.

Negotiation status: Complete Link partner status: OK

Ethernet interface is connected to a device that performs autonegotiation and the autonegotiation process completes successfully.

Link partner: Half-duplex

Depends on the capability of the attached Ethernet device.

Flow control: Symmetric/asymmetric

Displays the types of flow control supported by the remote Ethernet device.

Monitor Statistics for a Fast Ethernet or Gigabit Ethernet Interface

  • Purpose
  • Action
  • Meaning

Purpose

To monitor statistics for a Fast Ethernet or Gigabit Ethernet interface, use the following Junos OS CLI operational mode command:

Action

user@host> monitor interface (fe-fpc/pic/port | ge-fpc/pic/port)

We recommend that you use the monitor interface fe-fpc/pic/port or monitor interface ge-fpc/pic/port command only for diagnostic purposes. Do not leave these commands on during normal router operations because real-time monitoring of traffic consumes additional CPU and memory resources.

Sample Output

The following sample output is for a Fast Ethernet interface:

user@host> monitor interface fe-2/1/0 Interface: fe-2/1/0, Enabled, Link is Up Encapsulation: Ethernet, Speed: 100mbps Traffic statistics: Current Delta Input bytes: 282556864218 (14208 bps) [40815] Output bytes: 42320313078 (384 bps) [890] Input packets: 739373897 (11 pps) [145] Output packets: 124798688 (1 pps) [14] Error statistics: Input errors: 0 [0] Input drops: 0 [0] Input framing errors: 0 [0] Policed discards: 6625892 [6] L3 incompletes: 75 [0] L2 channel errors: 0 [0] L2 mismatch timeouts: 0 [0] Carrier transitions: 1 [0] Output errors: 0 [0] Output drops: 0 [0] Aged packets: 0 [0] Active alarms : None Active defects: None Input MAC/Filter statistics: Unicast packets 464751787 [154] Packet error count 0 [0]

Meaning

Use the information from this command to help narrow down possible causes of an interface problem.

If you are accessing the router from the console connection, make sure you set the CLI terminal type using the set cli terminal command.

The second column shows cumulative statistics since the last time you cleared them using the clear interfaces statistics interface-name command. The third column shows cumulative statistics since you ran the monitor interface interface-name command. If input errors are increasing, follow these steps:

  • Check the cabling to the router and ask the carrier to verify the line’s integrity. Ensure you are using the correct cables for the interface port—single-mode fiber for a single-mode interface, and multimode fiber for a multimode interface.

  • For fiber-optic connections, measure the received light level at the receiver end and ensure it meets the Ethernet interface’s specification.

  • Measure the transmit light level on the Tx port to confirm it is within the specified range.

Fiber-Optic Ethernet Interface Specifications

Table 7 shows the specifications for fiber-optic interfaces.

Table 7: Fiber-Optic Ethernet Interface Specifications

Fiber-Optic Ethernet Interface

Length

Wavelength

Average Launch Power

Receiver Saturation

Receiver Sensitivity
Gigabit Ethernet

Duplex SC connector

  

LH optical interface

49.5-mile 70-km reach on 8.2-micrometer SMF

1480 to 1580 nm

-3 to +2 dBm

-3 dBm

-23 dBm (BER 1012) for SMF

LX optical interface

6.2-mile 10-km reach on 9/125-micrometer SMF

1804.5-ft 550-m reach on 62.5/125- and 50/125-micrometer MMF

1270 to 1355 nm

-11 to -3 dBm

-3 dBm

-19 dBm

SX optical interface

656-ft 200-m reach on 62.5/125-micrometer MMF

1640-ft 500-m reach on 50/125-micrometer MMF

830 to 860 nm

-9.5 to -4 dBm

-3 dBm

-17 dBm
Fast Ethernet 8-Port

FX optical interface with MT-RJ connector

1.24-mile 2-km reach on 62.5/125-micrometer MMF

1270 to 1380 nm

-20 to -14 dBm

-14 dBm

-34 dBm

See Also

  • Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion
  • Calculating Power Budget and Power Margin for Fiber-Optic Cables
  

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