
© 2012 Cisco and/or its affiliates. All rights reserved.
Presentation_ID
Cisco Public
© 2013 Cisco and/or its affiliates. All rights reserved.
BRKARC-3470 Cisco Public
79
Atomic Policy Programming Cont.
• To support atomic programming, software reserves 50% of available TCAM
• If insufficient resources available, system returns an error and no modifications
made in hardware
‒ Failed to complete Verification: Tcam will be over used, please turn
off atomic update
• Disable with no platform access-list update atomic
‒ Disabling may be necessary for very large ACL configurations
‒ Atomic programming attempted but not mandatory
• User can disable atomic programming and perform update non-atomically
(assuming ACL fits in CL TCAM)
‒ “Default” ACL result (deny by default) returned for duration of reprogramming
‒ Use [no] hardware access-list update default-result permit to control default result
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