Physical interface

Name of the physical interface.

All levels

Interface index

Physical interface's index number, which reflects its initialization sequence.

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Generation

Unique number for use by Juniper Networks technical support.

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MTU

Maximum transmission unit size on the physical interface.

All levels

Interface flags

Information about the interface. Possible values are described in the “Interface Flags” section under Common Output Fields Description.

All levels

Input rate

(Redundant LSQ) Rate of bits and packets received on the interface.

None specified

Statistics last cleared

Time when the statistics for the interface were last set to zero.

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Frame exceptions

Information about framing exceptions. Includes events recorded under Exception Events for each logical interface.

• Oversized frames—Number of frames received that exceed maximum frame length. Maximum length is 4500 Kb (kilobits).
• Errored input frames—Number of input frame errors.
• Input on disabled link/bundle—Number of frames received on disabled links. These frames can result either from an inconsistent configuration, or from a bundle or link being brought up or down with traffic actively flowing through it.
• Output for disabled link/bundle—Number of frames sent for a disabled or unavailable link. These frames can result either from an inconsistent configuration, or from a bundle being brought up or down while traffic is flowing through it.
• Queuing drops—Total number of packets dropped before traffic enters the link services IQ interface. Indicates that the interface is becoming oversubscribed.

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Assembly exceptions

(Multilink Frame Relay end-to-end only) Information about assembly exceptions. Includes events recorded under Exception Events for each logical interface.

An assembly exception does not necessarily indicate an operational problem with the physical link services IQ interface itself. If multilink-encapsulated traffic is dropped or reordered after a sequence number has been assigned, the interface records one or more exception events. The physical interface can drop multilink-encapsulated fragments itself as a result. Any multilink packets or fragments dropped by the interface itself result in packet or fragment drop counts on individual logical interfaces. If the logical interface drop counts are zero, but exception events are seen, the most likely cause is a problem with the individual link interfaces. Even if the logical interface fragment drop counts are nonzero, excess differential delay or traffic losses on individual interfaces can be the root cause.

• Fragment timeout—The drop timer expired while a fragment sequence number was outstanding. Occurs only if the drop timer is enabled. This timeout can occur if the differential delay across the links in a bundle exceeds the drop-timer setting, or if a multilink packet is lost in transit while the drop timer is enabled. These events do not necessarily indicate any problem with the operation of the physical link services IQ interface itself, but can occur when one or more individual links drop traffic. Check the logical interface exception event counters to determine which bundle is responsible.
• Missing sequence number—A gap was detected in the sequence numbers of fragments on a bundle. These events do not necessarily indicate any problem with the operation of the physical link services IQ interface itself, but can occur when one or more individual links drop traffic. Check the logical interface exception event counters to determine which bundle is responsible.
• Out-of-order sequence number—Two frames with out-of-order sequence numbers within a single link. This event indicates that an individual link within a bundle reordered traffic, making the link services IQ interface unable to correctly process the resulting stream. Check the logical interface exception event counters to determine which bundle is responsible.
• Out-of-range sequence number—Received a frame with an out-of-range sequence number. These events can occur when a large amount of multilink-encapsulated traffic is lost or the multilink peer is reset, so that a large jump in sequence numbers results. A small number of these events can occur when the far end of a bundle is taken down or brought up. Check the logical interface exception event counters to determine which bundle is responsible.

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Egress queues

Total number of egress queues supported on the specified interface.

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Index

Logical interface index number, which reflects its initialization sequence.

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Generation

Unique number for use by Juniper Networks technical support

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Encapsulation

Encapsulation being used: PPP or Multilink PPP.

All levels

Bundle options

(Multilink Frame Relay end-to-end interfaces only)

• MRRU—Configured size of the maximum received reconstructed unit (MRRU): 1500 through 4500  bytes. The default is 1504 bytes.
• Drop timer period—Drop timeout value to provide a recovery mechanism if individual links in link services bundle drop one or more packets: 0 though 2000  milliseconds. Values under 5 ms are not recommended. The default setting is 0, which disables the timer.
• Sequence number format—Short sequence number header format (MLPPP only).
• Fragmentation threshold—Configured fragmentation threshold: 64 through 16,320  bytes, in integer multiples of 64  bytes. The default setting is 0, which disables fragmentation.
• Links needed to sustain bundle—Minimum number of links to sustain the bundle: 1 through 8.
• Multilink classes—Number of multilink classes negotiated.
• Link layer overhead—Percentage of bundle bandwidth to be set aside for link-layer overhead.

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Statistics

Information about fragments and packets received and sent by the router. All references to traffic direction (input or output) are defined with respect to the router. Input fragments received by the router are assembled into input packets; output packets are segmented into output fragments for transmission out of the router. Each field has columns that indicate the number of frames received and transmitted, frames per second (fps), the number of bytes received and transmitted, and bits per second (bps).

• Bundle—Information for each active bundle link.
  • Fragments: Input and Output—Total number and rate of fragments received and transmitted.
  • Packets: Input and Output—Total number and rate of packets received and transmitted.
  • Multilink class—(MC-MLPPP only) Information about multiclass links used in the multilink operation.
• Link—Information about links used in the multilink operation.
  • Link name—Interface name of the link services IQ channel and state information (physical link up or down).
  • Input and Output—Total number and rate of fragments and packets received and transmitted.

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Protocol

Protocol family configured on the logical interface.

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Generation

Unique number for use by Juniper Networks technical support only.

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Flags

Information about the protocol family flags. Possible values are described in the “Family Flags” section under Common Output Fields Description.

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Destination

IP address of the remote side of the connection.

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Broadcast

Broadcast address on the logical interface.

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Index

Logical interface index number, which reflects its initialization sequence.

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Generation

Unique number for use by Juniper Networks technical support.

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SNMP-Traps

SNMP trap notifications are enabled.

All levels

Last flapped

Date, time, and how long ago the interface went from down to up. The format is Last flapped: year-month-day hour:minute:second timezone (hour:minute:second ago) . For example, Last flapped: 2002-04-26 10:52:40 PDT (04:33:20 ago).

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Bundle links Iinformation

Information about the bundled links.

• Active bundle links—Number of active links.
• Removed bundle links—Information about links used in the multilink operation.
• Disabled bundle links—Number of disabled links.

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Bundle status (MLPPP)

Information about bundle status:

• Received sequence number—Sequence number for received packets.
• Transmit sequence number—Sequence number for transmitted packets.
• Packet drops—Number and byte count of output packets that were dropped, rather than being encapsulated and sent out of the router as fragments. The packet drop counter is incremented if there is a temporary shortage of packet memory on the AS PIC, which causes packet fragmentation to fail.
• Fragment drops—Number and byte count of input fragments that were dropped, rather than being reassembled and handled by the router as packets. This counter also includes fragments that have been received successfully but had to be dropped because not all fragments that constituted a packet had been received. The fragment drop counter is incremented when a fragment received on constituent links is dropped. Drop fragments can be triggered by sequence ordering errors, duplicate fragments, timed-out fragments, and bad multilink headers.
• MRRU exceeded—Number of reassembled packets exceeding the MRRU. This counter is not implemented in this release.
• Fragment timeout—The drop timer expired while a fragment sequence number was outstanding. Occurs only if the drop timer is enabled. This timeout can occur if the differential delay across the links in a bundle exceeds the drop-timer setting, or if a multilink packet is lost in transit while the drop timer is enabled.
• Missing sequence number—A gap was detected in the sequence numbers of fragments on a bundle.
• Out-of-order sequence number—Two frames with out-of-order sequence numbers occurred within a single link. This event indicates that an individual link within a bundle reordered traffic, making the multilink interface unable to correctly process the resulting stream.
• Out-of-range sequence number—A frame was received with an out-of-range sequence number. These events can occur when a large amount of multilink-encapsulated traffic is lost or the multilink peer is reset, so that a large jump in sequence numbers results. A small number of these events can occur when the far end of a bundle is taken down or brought up.
• Packet data buffer overflow—Packet buffer memory is full. This overflow can occur when the aggregate data rate exceeds the physical link services IQ interface capacity.
• Fragment data buffer overflow—Fragment buffer memory is full. This overflow can occur when excessive differential delay is experienced across the links within a single bundle, or when the aggregate data rate exceeds the physical link services IQ capacity.

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Multilink detail statistics

Frames, bytes, and bits per second received and sent by the bundle. All references to traffic direction (input or output) are defined with respect to the router. Each field has columns that indicate the number of frames received and transmitted, frames per second (fps), the number of bytes received and transmitted, and bits per second (bps).

• Bundle—Information for the bundle link.
  • Fragments: Input and Output—Total number and rate of multilink fragments received and transmitted.
  • Non-fragments: Input and Output—Total number and rate of nonfragmented multilink frames received and transmitted.
  • LFI: Input and Output—Total number and rate of link fragmented and interleaved frames and bytes.

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MTU

MTU size on the logical interface. If the MTU value is negotiated down to meet the MRRU requirement on the remote side, this value is marked Adjusted.

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Route Table

Routing table in which this address exists. For example, Route table:0 refers to inet.0.

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Destination

IP address of the remote side of the connection.

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Broadcast

Broadcast address on the logical interface.

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