Monitoring Memory Management Protection Information


Display information about memory management protection of the router.

Note: You can use the show memory-management protection command only in the support mode and it is not user configurable.


To display information about memory management protection of the router:

host1#show memory-management protection 
Mgr summary: 
  memory protection mode: 2 (app-level protection, audit only) 
  stacks excluded: true 
  allowed faults: 
    interrupt: yes 
    kernel:    yes 
    shell:     yes 
    vxWorks:   yes 
    OsTask:    yes 
  error conditions: 
     fault ring full      0 
     reversion queue full 0 
     memProtLock count: 1 
     maxReversionQueueDepth: 0 
     context switch stack: 0xaa2646c 
Mmu driver summary: 
  page size: 4096 
  total memory mapped: 0x80436000 (2052MB, 525366 pages) 
  highest mapped address: 0xffffffff 
Page table summary: 
    8388608 (2^23) bytes 
    1048576 entries 
    131072 groups 
  address: 0x2c000000 
  findEntry errors: 0 
Context stats: 
   current    145 
   high-water 149 
   accum      244 (0 Hz) 
Fault summary: 
  faulter counts: 
    interrupt 0 
    kernel    0 
    shell     0 
    vxWorks   0 
    OsTask    0 
    normal    0 
Rule stats: 
  current    256 
  high-water 258 
  accum      28 (0 Hz) 
  partialPagesIgnored 0 
  partialPagesExtended 0 


Table 80 lists the show memory-management protection command output fields.

Table 80: show memory-management protection Output Fields

Field Name

Field Description

Mgr summary

Information about the OS Memory Manager memory protection mode:

  • memory protection mode—There are four modes of this protection:
    • 0 (disable)—Disable all memory protection
    • 1 (basic)—no app-level protection
    • 2 (audit)—violations are logged but non-fatal
    • 3 (fault)—violations are fatal
  • stacks excluded—States if the stacks are excluded
  • allowed faults—States the different faults allowed for this mode (applicable only for mode 2 and 3):
    • interrupt—Interrupts the service routine
    • kernel—vxWorks kernel task
    • shell—vxWorks shell task
    • vxWorks—Generic vxWorks task
    • OsTask—Real OsTask
  • error conditions—Information about the several error counters and their values:
    • fault ring full—Counter for the fault ring is full
    • reversion queue full—Counter for the reversion queue is full
    • memProtLock count—Counter for the memory protection lock
    • maxReversionQueueDepth—Counter for the maximum possible depth for the reversion queue
    • context switch stack—Address for the context switch stack

Mmu driver summary

Information about the page size, total memory mapped, and the highest mapped address:

  • page size—Size of the page managed by the MMU
  • total memory mapped—Total amount of mapped memory
  • highest mapped address—Highest mapped address in the range

Page table summary

Information about the page table size along with the address and entry errors if any:

  • size—Size of the page table in bytes, entry count, and group count
  • address—Group address
  • findEntry errors—Count for the findEntry errors

Context stats

Information about the memory utilization of context switching stack (applicable only for mode 2 and 3):

  • current—Current count
  • high-water—High-water mark count for the context
  • accum—Accumulated count for the context

Fault summary

Information about the fault counters (applicable only for mode 2 and 3):

  • faulter counts—Details of counts for fault types:
    • interrupt—Fault counter for the interrupt type
    • kernel—Fault counter for the kernel type
    • shell—Fault counter for the shell type
    • vxWorks—Fault counter for the vxWorks type
    • OsTask—Fault counter for the OsTask type
    • normal—Non-fault count

Rule stats

Statistics related to the access policies of the memory area:

  • current—Current rule count
  • high-water—Rule statistics for the high-water mark count
  • accum—Rule statistics for the accumulated count
  • partialPagesIgnored—Count for ignored partial pages
  • partialPagesExtended—Count for extended partial pages

Related Documentation