Traffic Types

Routing protocols use different  traffic types to control how routing information are exchanged.

Unicast: traffic is exchanged between one sender and one receiver, communication between two points.

Multicast: traffic is exchanged between one sender and group of receivers. IPv4 reserved address space is – IPv6 reserved multicast addresses have the prefix FF00:/8

Broadcast: one receiver send traffic to all devices in the subnet. Local subnet address is IPv6 does not have broadcast traffic type.

Anycast: traffic is exchanged between one sender and nearest receiver from a group.

Early routing protocols used only broadcast traffic, but modern use multicast addresses.

Example IPv4:

  • – Used by OSPFv2: All OSPF routers
  • – Used by OSPFv2: All Designated routers
  • – Used by RIPv2
  • – Used by EIGRP

Example IPv6:

  • FF02::5 – Used by OSPFv3: All OSPF Routers
  • FF02::6 – Used by OSPFv3: All Designated Routers
  • FF02::9 – Used by RIPng
  • FF02::A – Used by EIGRP for IPv6