Cisco Cisco IOS Software Release 12.0(13)S7

To ensure control over the frequency of buffer recarving, use the bfrp carve-level command. Whenever 
buffer recarving occurs, packets sent to that line card are dropped. Use the command bfrp carve-level 0 
if you want to disable buffer recarving completely after recarving once to default buffer specifications. 
Use the command bfrp carve-level 1 if you want to perform buffer recarving only if the change in the 
MTU is changing the maximum slot MTU configured on any slot. Use the no bfrp carve-level command 
to restore the default carving mechanism.

Global configuration 

By default, buffer recarving is triggered if any of the cases discussed in the section 

 are met.

The following example shows how to recarve the default buffer distribution and disable further recarving 
for any MTU change. The maximum MTU configured on router is 6000:

Router> enable

Router# config t

Router(config)# bfrp carve-level 0

The following example shows that recarving is invoked only if the MTU change is changing the 
maximum slot MTU configured on any slot:

Router(config)# bfrp carve-level 1

The following example shows how to restore the default buffer recarving behavior: 

Router(config)# no bfrp carve-level 

Use the command bfrp carve-level 0 to accommodate all default buffer sizes on the router with a 
maximum buffer size of 9248 and then prevent further recarves on any MTU change. 

Applies default buffer distribution and disables buffer recarves completely.

Allows recarving only if the change in the MTU is changing the maximum slot MTU 
configured on any slot.

12.0(32.03)S03, 
12.0(32)S08, 
12.0(32)SY04

This command was introduced.