Solicited Node Multicast Address IPv6

1.Is Multicast.
2.Each IPv6 Host will compute and join at least one such address group
   per interface.
3.Used in NDP for obtaining Layer 2  address of other hosts.
4.Since an Interface can have many IPv6 addresses there can be
   multiple multicast groups to which the Host IPv6 address links,
   that is if the last 6 Hex characters vary.If the last  6 Hex characters
   in the IPv6 address remain the same the Multicast group remains the
   same.


Image is from Networklessons.com(the best)
All solicited node multicast group addresses start with FF02::1:FF /104:

• FF /8 is the IPv6 multicast range.
• FF02 /16 is the multicast link local scope.

Last 6 Hex characters or 24 bits to be added.

Note in the examples 3,4
as the last 6 Hex characters vary
the multicast groups vary.


Note :
Router Interface has to be in an up up state or a Host/PC
needs to be connected to the Router Interface.

Router#sh ip int

GigabitEthernet0/0 is up, line protocol is up (connected)

otherwise only FF02::1 is joined.


Example 1: Router(config)#int g0/0

Router(config-if)#ipv6 enable

  Router#sh ipv6 int g0/0

GigabitEthernet0/0 is up, line protocol is up

IPv6 is enabled, link-local address is FE80::240:BFF:FE8B:D801

No Virtual link-local address(es):

Global unicast address(es):

Joined group address(es):

FF02::1

FF02::1:FF8B:D801

MTU is 1500 bytes

ICMP error messages limited to one every 100 milliseconds

ICMP redirects are enabled

ICMP unreachables are sent

ND DAD is enabled, number of DAD attempts: 1

ND reachable time is 30000 milliseconds

Example 2:
(new IPv6 address but last 6 hex characters remain same)

  Router(config)#int g0/0

Router(config-if)#ipv6 address 2001:1:2:3::1/64 eui-64

Router#sh ipv6 int g0/0

GigabitEthernet0/0 is up, line protocol is up

IPv6 is enabled, link-local address is FE80::240:BFF:FE8B:D801

No Virtual link-local address(es):

Global unicast address(es):

2001:1:2:3:240:BFF:FE8B:D801, subnet is 2001:1:2:3::/64 [EUI]

Joined group address(es):

FF02::1

FF02::1:FF8B:D801

MTU is 1500 bytes

ICMP error messages limited to one every 100 milliseconds

ICMP redirects are enabled

ICMP unreachables are sent

ND DAD is enabled, number of DAD attempts: 1

ND reachable time is 30000 milliseconds

Example 3:
(new ipv6 address with last 6 Hex characters changing hence
  new multicast group)

Router(config-if)#ipv6 address 2001:5:6:7::1:1/128

Router#sh ipv6 int g0/0

GigabitEthernet0/0 is up, line protocol is up

IPv6 is enabled, link-local address is FE80::240:BFF:FE8B:D801

No Virtual link-local address(es):

Global unicast address(es):

2001:1:2:3:240:BFF:FE8B:D801, subnet is 2001:1:2:3::/64 [EUI]

2001:5:6:7::1:1, subnet is 2001:5:6:7::1:1/128

Joined group address(es):

FF02::1

FF02::1:FF01:1

FF02::1:FF8B:D801

MTU is 1500 bytes

ICMP error messages limited to one every 100 milliseconds

ICMP redirects are enabled

ICMP unreachables are sent

ND DAD is enabled, number of DAD attempts: 1

ND reachable time is 30000 milliseconds

Example 4 :
(new ipv6 address with last 6 Hex characters changing hence
  new multicast group)

Router(config-if)#ipv6 address 3001:2:4:5::2/112

Router#sh ipv6 int g0/0

GigabitEthernet0/0 is up, line protocol is up

IPv6 is enabled, link-local address is FE80::240:BFF:FE8B:D801

No Virtual link-local address(es):

Global unicast address(es):

2001:1:2:3:240:BFF:FE8B:D801, subnet is 2001:1:2:3::/64 [EUI]

2001:5:6:7::1:1, subnet is 2001:5:6:7::1:1/128

3001:2:4:5::2, subnet is 3001:2:4:5::/112

Joined group address(es):

FF02::1
FF02::1:FF00:2
FF02::1:FF01:1
FF02::1:FF8B:D801

MTU is 1500 bytes

ICMP error messages limited to one every 100 milliseconds

ICMP redirects are enabled

ICMP unreachables are sent

ND DAD is enabled, number of DAD attempts: 1

ND reachable time is 30000 milliseconds