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Configuring IP Multicasting Services
5-4 114064 Rev. B
Stream Control Messages
ST2 agents communicate with each other by exchanging messages defined by the
Stream Control Message Protocol (SCMP).
For example, an origin that wants to establish a stream sends an SCMP connect
message to the next-hop IP router downstream. The connection request includes
• A list of one or more targets.
• A hop identifier (HID). An HID is suggested by the upstream agent. The
downstream agent may accept the HID or propose an alternative HID.
• A flowspec listing the network resources required for the stream.
To accept a connection request from an upstream agent, the agent returns an
SCMP ACCEPT message.
In “ST2 Features” on page 5-6, T
able 5-1 lists all the SCMP messages currently
supported by the Bay Networks implementation of ST2.
Neighbors and Tunnels
An ST2 agent exchanges SCMP messages with next-hop agents. In an ST2
environment, next-hop agents are considered to be neighbors.
Neighbors can be connected in two ways -- directly or through an ST2 tunnel. In
F
igure 5-2 the ST2 agent on Router A has two neighbors, the agent on Router B
and the agent on Router D. Router A and Router B are connected directly -- they
both have an interface to Network 1. Router A and Router D are connected
through a tunnel that includes Network 2 and Network 3, and a router that does
not have ST2 capabilities, Router C.
Tunnels are configured by the network administrator to establish ST2 streams in
networks where not all IP routers are ST2 capable. For transmission through a
tunnel, SCMP messages and ST2 data are encapsulated in IP datagrams and
forwarded through a non-ST2 router, and decapsulated at the destination.
A non-ST2 router can provide a tunnel for both stream data and control messages;
however, a router that lacks ST2 capability cannot guarantee the resources listed
in the flowspec.
- Configuring IP 1
- Multicasting Services 1
- USA Requirements Only 3
- Canada Requirements Only 5
- T1 Service 8
- Bay Networks Software License 9
- (continued) 10
- Contents 11
- 114064 Rev. B 12
- About This Guide 21
- Conventions 22
- Acronyms 23
- Bay Networks Customer Service 24
- How to Get Help 25
- For More Information 25
- Chapter 1 27
- Multicasting Overview 27
- Multicast Addresses 28
- Multicast Protocols 29
- Chapter 2 31
- Starting ST2 33
- Click on OK 34
- Chapter 3 35
- Customizing IGMP 35
- IGMP Concepts and Terminology 36
- Configuring IGMP on the Router 37
- Configuring Logging 38
- Enabling and Disabling IGMP 39
- Specifying a Query Rate 39
- 3-6 114064 Rev. B 40
- Chapter 4 43
- Customizing DVMRP 43
- Neighbor Connections 44
- Figure 4-1. Multicast Routers 45
- Source Route Advertisements 46
- How DVMRP Chooses a Route 46
- Shortest-Path Trees 48
- Setting the Update Interval 49
- Configuring Tree Pruning 50
- Configuring DVMRP Timers 51
- 4-10 114064 Rev. B 52
- Specifying a Probe Interval 53
- Logging Debugging Messages 54
- Specifying an MTU Size 54
- Configuring DVMRP on a Circuit 55
- Specifying a Threshold 56
- Configuring a Forwarding Table 57
- Configuring a Tunnel 58
- Specifying the Cost 59
- Specifying a TTL 59
- 4-18 114064 Rev. B 60
- Chapter 5 61
- Customizing ST2 Services 61
- ST2 Concepts and Terminology 62
- Stream Control Messages 64
- Neighbors and Tunnels 64
- Resource Manager 65
- ST2 Features 66
- 5-8 114064 Rev. B 68
- 5-10 114064 Rev. B 70
- Configuring ST2 on the Router 72
- Configuring an ST2 Interface 73
- 5-14 114064 Rev. B 74
- Table 5-2. ST2 Timers 74
- Chapter 6 77
- Reserving Line Resources 77
- Supported Media 78
- Starting the Resource Manager 79
- Click on Values 80
- 6-6 114064 Rev. B 82
- 6-8 114064 Rev. B 84
- 6-10 114064 Rev. B 86
- 114064 Rev. B 6-13 89
- Appendix A 91
- 114064 Rev. B A-3 93
- A-4 114064 Rev. B 94
- 114064 Rev. B A-5 95
- A-8 114064 Rev. B 98
- 99
- 100
- 114064 Rev. B A-11 101
- IGMP Parameters 102
- 104
- A-16 114064 Rev. B 106
- IP Configuration Parameters 107
- A-18 114064 Rev. B 108
- ST2 Parameters 109
- 114064 Rev. B A-21 111
- A-22 114064 Rev. B 112
- 114064 Rev. B A-23 113
- 115
- A-26 114064 Rev. B 116
- Resource Manager Parameters 117
- 118
- 118
- 114064 Rev. B A-29 119
- 121
- A-32 114064 Rev. B 122
- 114064 Rev. B Index-1 123
- 114064 Rev. B Index-3 125
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