CISCO ROUTER BUFFERS TUNING

How to Tuning Cisco Router Buffers?

The router maintains two different sets of buffers: public buffers and interface buffers. 

The router uses these as temporary storage while processing packet data. You can tune the public buffer pools as follows:

Router1#configure terminal
Enter configuration commands, one per line. 
Router1(config)# buffers big initial 100
Router1(config)# buffers big max-free 200
Router1(config)# buffers big min-free 50
Router1(config)# buffers big permanent 50
Router1(config)# end
Router1#

And you can adjust the interface buffer pools by using a similar set of commands:

Router1#configure terminal
Enter configuration commands, one per line.
Router1(config)# buffers Ethernet0 initial 200
Router1(config)# buffers Ethernet0 max-free 300
Router1(config)# buffers Ethernet0 min-free 50
Router1(config)# buffers Ethernet0 permanent 50
Router1(config)# end
Router1#