SOROGREN#   conf t
Enter configuration commands, one per line.  End with CNTL/Z.
SOROGREN(config)#snmp-server community ?
  WORD  SNMP community string

SOROGREN(config)#snmp-server community sifre ?
  <1-99>       Std IP accesslist allowing access with this community string
  <1300-1999>  Expanded IP accesslist allowing access with this community
               string
  WORD         Access-list name
  ro           Read-only access with this community string
  rw           Read-write access with this community string
  view         Restrict this community to a named MIB view
  <cr>

SOROGREN(config)#snmp-server community sifre ro
SOROGREN(config)#CNTL/Z