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Configuring IPv6

Tips:

  • Allocate a /48 per building
  • Use a /64 for every subnet
  • Use a /1271 for transit links, but reserve the entire /64
  • Use SLAAC for client configuration
  • Provide DHCPv6 for scope options only (but also include them in the router advertisement)
  • Start your deployment with transit links and client subnets

Configuration samples

JunOS 

interfaces {
    irb {
        unit 1300 {
            description "IT Staff";
            family inet {
                address 10.95.20.1/24;
            }
            family inet6 {
                address 2620:1d5:9500:1300::1/64 {
                    subnet-router-anycast;
                }
            }
        }
    }
}
protocols {
    router-advertisement {
        interface irb.1300 {
            other-stateful-configuration;
            dns-server-address 2620:1d5:9500:1103::dc;
            dns-server-address 2620:1d5:9501:1103::dc;
            prefix 2620:1d5:9500:1300::/64;
        }
    }
}
forwarding-options {
    dhcp-relay {
        dhcpv6 {
            group TTL {
                interface irb.1300;
            }
            server-group {
                TTL {
                    2620:1d5:9500:1103::dc;
                    2620:1d5:9501:1103::dc;
                }
            }
            active-server-group TTL;
        }
        forward-only;
        server-group {
            TTL {
                10.95.5.2;
                10.95.69.2;
            }
        }
        group TTL {
            active-server-group TTL allow-server-change;
            interface irb.1300;
        }
    }
}

Cisco IOS 

interface Vlan1300
 description "IT Staff"
 ip address 10.95.20.1 255.255.255.0
 ip helper-address 10.95.5.2
 ip helper-address 10.95.69.2
 ipv6 address 2620:1d5:9500:1300::/64 anycast
 ipv6 enable
 ipv6 nd other-config-flag
 ipv6 dhcp relay destination 2620:1d5:9500:1103::dc
 ipv6 dhcp relay destination 2620:1d5:9501:1103::dc
!

Ruckus ICX 

interface ve 1300
 port-name IT_Staff
 ip address 10.95.20.1/24
 ip helper-address 1 10.95.5.2
 ip helper-address 2 10.95.69.2
 ipv6 address 2620:1d5:9500:1300::1/64
 ipv6 address 2620:1d5:9500:1300::/64 anycast
 ipv6 dhcp-relay destination 2620:1d5:9500:1103::dc
 ipv6 dhcp-relay destination 2620:1d5:9501:1103::dc
 ipv6 nd other-config-flag
!

  1. Some equipment doesn't support /127, so a /126 may be used if necessary ↩