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Configuring IP Multicasting Services
1-2 114064 Rev. A
An IP multicasting host group can consist of zero or more members and places no
restrictions on its membership. Host members can reside anywhere; they can join
and leave the group at any time; and they can be members of more than one group
at the same time. In order to receive a multicast message from a host group, a host
must be a member of the group. However, anyone can send a multicast datagram:
a host does not need to be a member of a group to send a multicast message to its
members.
In general, hosts that are members of the same group reside on different networks.
However, a range of multicast addresses (224.0.0.x) is reserved for groups that are
locally scoped. All message traffic for these hosts remains on the local network.
Hosts that belong to a group in this address range and that reside in different
networks will not receive each other’s message traffic.
Multicast Addresses
Each host group is assigned a unique multicast address. To reach all members of
the group, a sender uses the multicast address as the destination address of the
datagram.
An IP Version 4 multicast address is a Class D address (the high-order bits are set
to 1110) in the range of 224.0.0.0 to 239.255.255.255.
The block of addresses from 224.0.0.1 to 224.0.0.255 is reserved for the use of
routing protocols and other low-level protocols. Multicast routers will not forward
datagrams with addresses in this range.
Note: Multicast data packets are affected by traffic filters. The network
administrator must ensure that traffic filters configured on a multicast router do
not prevent a host that is a member of a group from receiving packets intended
for that group.
- Configuring IP 1
- Multicasting Services 1
- Bay Networks Software License 3
- Contents 5
- 114064 Rev. A vii 7
- 114064 Rev. A ix 9
- 114064 Rev. A xi 11
- About This Guide 13
- Conventions 14
- Acronyms 15
- 114064 Rev. A xvii 17
- Bay Networks Customer Service 18
- World Wide Web 19
- Customer Service FTP 19
- Support Source CD 20
- CompuServe 20
- InfoFACTS 21
- How to Get Help 21
- Chapter 1 23
- Multicasting Overview 23
- Multicast Addresses 24
- Multicast Protocols 25
- Chapter 2 27
- Starting ST2 29
- Chapter 5 30
- Chapter 3 31
- Customizing IGMP 31
- IGMP Concepts and Terminology 32
- Configuring IGMP on the Router 33
- Configuring Logging 34
- Enabling and Disabling IGMP 35
- Specifying a Query Rate 35
- 3-6 114064 Rev. A 36
- Chapter 4 39
- Customizing DVMRP 39
- Neighbor Connections 40
- Figure 4-1. Multicast Routers 41
- Source Route Advertisements 42
- How DVMRP Chooses a Route 42
- Shortest-Path Trees 44
- Setting the Update Interval 45
- Configuring Tree Pruning 46
- Configuring DVMRP Timers 47
- 4-10 114064 Rev. A 48
- Specifying a Probe Interval 49
- Logging Debugging Messages 50
- Specifying an MTU Size 50
- Configuring DVMRP on a Circuit 52
- Specifying a Threshold 54
- Configuring a Forwarding Table 55
- Configuring a Tunnel 56
- Specifying the Cost 57
- Specifying a TTL 57
- 4-20 114064 Rev. A 58
- Customizing ST2 Services 59
- ST2 Concepts and Terminology 60
- ST20001A 61
- Stream Control Messages 62
- Neighbors and Tunnels 62
- Figure 5-2. ST2 Neighbors 63
- (continued) 64
- (continued) 65
- 5-8 114064 Rev. A 66
- 5-10 114064 Rev. A 68
- ST20002A 69
- Configuring ST2 on the Router 70
- Configuring an ST2 Interface 71
- 5-14 114064 Rev. A 72
- 5-16 114064 Rev. A 74
- Appendix A 75
- A-2 114064 Rev. A 76
- 114064 Rev. A A-3 77
- A-4 114064 Rev. A 78
- 79
- A-6 114064 Rev. A 80
- A-8 114064 Rev. A 82
- 83
- 114064 Rev. A A-11 85
- A-12 114064 Rev. A 86
- IGMP Parameters 87
- 88
- A-16 114064 Rev. A 90
- IP Configuration Parameters 91
- A-18 114064 Rev. A 92
- ST2 Parameters 93
- 114064 Rev. A A-21 95
- A-22 114064 Rev. A 96
- 114064 Rev. A A-23 97
- 99
- A-26 114064 Rev. A 100
- 114064 Rev. A Index-1 101
- 114064 Rev. A 102
- 114064 Rev. A Index-3 103
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