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Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Caveats
Resolved Caveats—Cisco IOS Release 12.0(32)S
Conditions: This symptom is observed on a Cisco 12000 series Ethernet ISE line card when one of
its subinterfaces is configured for Xconnect and has a layer 2 VPN configured and when the
following events occur:
–
You attach a policy to the subinterface.
–
You remove the policy from the subinterface.
–
You attach the policy to the main interface.
Workaround: There is no workaround.
• CSCei88040
Symptoms: A Cisco 12000 Engine 3 line card might be affected by a memory leak in the “CEF LC
IPC Backg” process that is caused by IPv6 route changes.
If all the line card route memory is consumed, the following error messages might be seen:
%SYS-2-MALLOCFAIL: Memory allocation of 65556 bytes failed
from 0x400DCE94, alignment 32
Pool: Processor Free: 533440 Cause: Memory fragmentation
Alternate Pool: None Free: 0 Cause: No Alternate pool
-Process= "CEF LC IPC Background", ipl= 0, pid= 71
-Traceback= 40030CBC 400E22FC 400E6A38 400DCE9C 404ADB0C 404ADD80 4042354C 40425464
4114 4B08 411444AC 411443A4 4114B68C 410ECB6C 410ECEB4 410EDC3C
%EE48-3-IPV6_TCAM_CAPACITY_EXCEEDED: IPv6 pkts will be soft ware switched.
To support more IPv6 routes in hardware:
Get current TCAM usage with: show controllers ISE <slot> tcam
In config mode, reallocate TCAM regions e.g. reallocate NetFlow TCAM to IPv6
hw-module slot <num> tcam carve rx_ipv6_1 <prefix> <v6-percent>
hw-module slot <num> tcam carve rx_top_nf <nf-percent>
Verify with show command that sum of all TCAM regions = 100%
Reload the linecard for the new TCAM carve config to take effect
WARNING: Recarve may affect other input features(ACL,CAR,MQC,Netflow)
Doing the recarve, as suggested, will not fix the problem, except that by reloading the line card, the
leaked memory will be recovered temporarily.
Conditions: This symptom occurs when continuous IPv6 routes change on an Engine 3 line card.
Workarounds:
[1] Reloading the line card can fix the problem temporarily.
[2] Disabling TCAM IPv6 lookups by emptying the IPv6 TCAM:
hw-module slot <slot number> tcam carve RX_IPv6_144b_REGION 128 0
hw-module slot <slot number> tcam carve RX_TOP_NF_REGION 39
microcode reload <slot number>
To disable [2], just use the “no” form of the command to get back to the default setting:
no hw-module slot <slot number> tcam carve RX_IPv6_144b_REGION 128 0
no hw-module slot <slot number> tcam carve RX_TOP_NF_REGION 39
microcode reload <slot number>
The default is 35% for NetFlow (RX_TOP_NF_REGION) and 4% for IPv6
(RX_IPv6_144b_REGION 128).
You can check the current status of the TCAM allocation with:
exec slot <slot number> sh controllers tofab alpha tcam carve | i
IPv6_128|Total|Mask|RX_TOP_NF
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