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Cisco Bug: CSCut59754 - ACLTCAM zoning region count goes negative

Last Modified

May 23, 2018

Products (1)

  • Cisco MDS 9000 Series Multilayer Switches

Known Affected Releases

6.2(13)FM(0.52) 6.2(13b)

Description (partial)

Symptom:
TCAM errors appear in syslog with the following:

<pre>
show logging log
...snip
2015 Jan  1 05:00:01 switchname %ZONE-2-ZS_TCAM_PROGRAMMING_FAILED: %$VSAN 10%$ TCAM operation failed : Unknown, Reason: Unable to allocate TCAM Space 
2015 Jan  1 05:00:01 switchname %ZONE-2-ZS_TCAM_SWITCHED_TO_SOFT_ZONING_MODE: %$VSAN 10%$ Switched to soft zoning : Reason: Hard zoning disabled 
2015 Jan  1 05:00:01 switchname %ZONE-2-ZS_TCAM_PROGRAMMING_FAILED: %$VSAN 10%$ TCAM operation failed : Unknown, Reason: Unable to allocate TCAM Space
</pre>

Conditions:
These errors may appear due to a negative value found in the zoning region (region 3) of TCAM. To verify issue the command:

<pre>
show system internal acl tcam-usage

TCAM Entries: 
=============
                  Region1   Region2    Region3     Region4   Region5   Region6 
Mod Fwd   Dir     TOP SYS  SECURITY    ZONING      BOTTOM    FCC DIS   FCC ENA 
    Eng          Use/Total Use/Total  Use/Total   Use/Total Use/Total Use/Total
--- ---  ------ ---------- --------- ------------ --------- --------- ---------
...snip
3   0    INPUT     45/19664    0/9840     0/49136*   78/19664    0/0       0/0   
3   0    OUTPUT     5/4077    0/1645     0/11469     0/4077    6/1651    9/1654
3   1    INPUT    261/19664    0/9840     0/49136*  204/19664    0/0       0/0   
3   1    OUTPUT    16/4075    0/1643     0/11467     0/4075    6/1649   21/1664
3   2    INPUT    178/19664    0/9840     0/49136*  112/19664    0/0       0/0   
3   2    OUTPUT    21/4073    0/1641     0/11465     0/4073    6/1647   33/1674
3   3    INPUT    192/9824    0/0    -1126/-1126*  131/9824    0/0       0/0       < --
3   3    OUTPUT    17/4073    0/1641     0/11465     0/4073    6/1647   33/1674
</pre>
In the example above module 3 forwarding engine 3 is affected.

Related Community Discussions

<key>CSCUT59754</key> affected code versions?
I heard 6.2(15) was also affected but not listed in the bug details. What others versions are affected?
Latest activity: Apr 18, 2017
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