About this task
            
Create a rag_pol_1
                                                RA Guard policy for the router and configure the source
                                                IPv6 access list to allow only the RA packets that
                                                originate from the source IPv6 address fe80:0:0:0:cef9:54ff:feb4:9481/128. This
                                                configuration verifies the prefixes sent in the RA
                                                packets. 
Procedure
- 
        Enter Global Configuration mode:
        
          enable configure
              terminal 
 
- 
                                                Enter the RA Guard mode and configure RA Guard policy (rag_pol_1) for the interface connected
                                                  to a router. 
                                                
                                                  ipv6 fhs ra-guard policy
                                                  rag_pol_1 
 
- Configure the source
IPv6 access list to allow only RA packets originating from the source
IPv6 address fe80:0:0:0:cef9:54ff:feb4:9481/128.
match ipv6 ra-srcaddr-list ipv6_acl_1 
 
- Verify the prefixes sent in the RA packets so that the
rtr_pip IPv6 ACL configuration allows only the prefix 60::0/64.
match reply ra-prefix-list ipv6_acl_1