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Monitoring APS/MSP

You can use the show aps commands to monitor APS/MSP.

show aps

Use to display information about interfaces on which APS/MSP is configured.
Use the all keyword to display information from all APS/MSP groups. In the output, partially configured controllers are displayed with none and include only the group name.
Field descriptions
- sonet x/y—Location of the SONET/SDH interface
- protect group—Name of the APS group that contains the working interface and the corresponding protect interface
- channel—Number of the APS channel; 0 identifies the protect interface, 1 identifies the working interface
- ~—Interface is not currently active
- Selected—Interface is active
- ~Selected—Interface is not active
- Bidirectional—Router switches to the protect interface using the bidirectional switching mechanism
- Unidirectional—Router switches to the protect interface using the unidirectional mode switching mechanism
- Nonrevertive—Router does not revert to the working interface when it recovers
- Revertive—Router reverts to the working interface when it recovers
- Disabled—APS/MSP is disabled on the interface
- Enabled—APS/MSP is enabled on the interface

Example 1

host1#show aps
sonet 5/1 protect group one channel 0  ~Selected Unidirectional Nonrevertive
sonet 5/0 working group one channel 1   Selected Enabled

Example 2

host1#show aps all
aps events: disabled
sonet 4/0 working group group-4 channel 1   Selected Enabled 
sonet 4/1 protect group group-4 channel 0  ~Selected Unidirectional Nonrevertive 
sonet 2/0 working group group-2 channel 1   Selected Enabled 
sonet 2/1 protect group group-2 channel 0  ~Selected Unidirectional Nonrevertive 
sonet 12/0
sonet 12/1
sonet 12/2 none    group partial-group
sonet 12/3
sonet 12/4
sonet 12/5
sonet 12/6
sonet 12/7

See show aps.

show aps group

Use to display information about all APS/MSP groups or a specified APS/MSP group.
Field descriptions
- Aps group—Name of the APS group for which information is displayed
- Current Conditions—Current state of the group
- Rx (K1/K2)—Value, meaning, and channel number of the received K1 and K2 bytes (see Table 8 and Table 9)
- Tx (K1/K2)—Value, meaning, and channel number of the transmitted K1 and K2 bytes (see Table 8 and Table 9)
- Counters—Statistics for APS group
  - ModeMismatch—Number of differences detected in the local and remote switching mechanisms (unidirectional or bidirectional modes)
  - ChanMismatch—Number of differences detected between the number of the channel in the transmitted K1 byte and the number of the channel in the received K2 byte
  - PSBF—Number of protection switching byte failures detected (no 3 consecutive SONET/SDH frames out of the last 12 contain identical K1 bytes)
  - FEPLF—Number of far-end protection line failures (signal failures detected on protect interface)
- Aps channel—Number, interface specifier (in slot/port format), and protect/working designation of the APS channel for which information is displayed
  - aps-protect—Identifies the protect interface
  - aps-working—Identifies the working interface
- Current Conditions—Current state of the interface for this channel
  - lockedOut—Indicates that the router is configured to prevent the protect interface from taking over if the primary interface fails
  - SD—Indicates that signal degradation is detected
  - SF—Indicates that signal failure is detected
  - switched—Indicates that the router has switched from the working interface to the protect interface
- Counters—Statistics for APS channel
  - SignalDegrades—Number of degraded signals detected
  - SignalFailures—Number of failed signals detected
  - Switchovers—Number of times the router has switched from the working interface to the protect interface
  - LastSwitchover—Length of time that the working interface was active when the router last switched from the working interface to the protect interface; a value of Not Applicable indicates that no switchovers have occurred

Example

host1#show aps group
Aps group bos
  Current Conditions: PSBF
  Rx(K1/K2): 00/00, No Request on channel 0
  Tx(K1/K2): f0/05, Lockout of Protection on channel 0
  Counters
    ModeMismatch = 0
    ChanMismatch = 0
    PSBF         = 1
    FEPLF        = 0
  Aps channel 0  (5/4) (aps-protect)
    Current Conditions: SF
    Counters
      SignalDegrades = 0
      SignalFailures = 1
  Aps channel 1  (5/0) (aps-working)
    Current Conditions: None
    Counters
      SignalDegrades = 0
      SignalFailures = 0
      Switchovers    = 0
      LastSwitchover = Not Applicable

See show aps.

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