CCNP - ENTERPRISE - DESIGN - Well Known Multicast Addresses

In the CCDP ARCH exam there are numerous refereences to Multicast addresses.

This post is to simply catalogue those that are specifically refered to in the various reading materials I've covered.

Address Scope:

• 224.0.0.0 /4 - Class D reservation

Address type:

• 224.0.0.0 to 224.0.0.255 - assigned by IANA for services (detailed below)
• 224.0.1.0 to 224.0.1.255 - Control Block - assigned by IANA for traffic crossing public networks e.g.- NTP 224.0.1.1
•  224.0.2.0 to 224.0.255.255 - AD-HOC block assigned by IANA for addresses that don't fit the above ranges
• 224.3.0.0 to 224.4.255.255 - AD-HOC block assigned by IANA for addresses that don't fit the above ranges
• 233.252.0.0 to 233.255.255.255-  AD-HOC block assigned by IANA for addresses that don't fit the above ranges
• 232.0.0.0 255.0.0.0 - Source-Specfic Multicast Addresses
• 233.0.0.0 255.0.0.0 - GLOP addresses - Originally experimental now publically assigned addresses for use by ISPs and any organisation want to ublich content over Multicast
• 234.0.0.0 255.0.0.0 - Uni-cast Prefix addresses
• 239.0.0.0 255.0.0.0 - Administratively scoped IPv4 addresses, locally assigned, not globally unique

Well Known Addresses:

224.0.0.1 The All Hosts multicast group addresses all hosts on the same network segment.

224.0.0.2 The All Routers multicast group addresses all routers on the same network segment.

224.0.0.5 The Open Shortest Path First (OSPF) All OSPF Routers address is used to send Hello packets to all OSPF routers on a network segment.

224.0.0.6 The OSPF All Designated Routers ""(DR)"" address is used to send OSPF routing information to designated routers on a network segment.

224.0.0.9 The Routing Information Protocol (RIP) version 2 group address is used to send routing information to all RIP2-aware routers on a network segment.

224.0.0.10 The Enhanced Interior Gateway Routing Protocol (EIGRP) group address is used to send routing information to all EIGRP routers on a network segment.

224.0.0.13 Protocol Independent Multicast (PIM) Version 2

224.0.0.18 Virtual Router Redundancy Protocol (VRRP)

224.0.0.19 - 21 IS-IS over IP

224.0.0.22 Internet Group Management Protocol (IGMP) version 3

224.0.0.102 Hot Standby Router Protocol version 2 (HSRPv2) / Gateway Load Balancing Protocol (GLBP)

224.0.1.1 Network Time Protocol clients listen on this address for protocol messages when operating in multicast mode.

224.0.1.39 The Cisco multicast router AUTO-RP-ANNOUNCE address is used by RP mapping agents to listen for candidate announcements.

224.0.1.40 The Cisco multicast router AUTO-RP-DISCOVERY address is the destination address for messages from the RP mapping agent to discover candidates.

224.0.1.41 H.323 Gatekeeper discovery address

239.255.255.250 Simple Service Discovery Protocol address