Here an configuation of SLB :
DSW121#c
Enter configuration commands, one per line. End with CNTL/Z.
DSW121(config)#ip sl
DSW121(config)#ip sl?
sla slb
DSW121(config)#ip slb ?
dfp configure Dynamic
Feedback Protocol manager
entries initial and maximum SLB entries
serverfarm configure an SLB server farm
vserver configure an SLB virtual server