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Configuring IP Multicasting Services
4-16 114064 Rev. A
Specifying a Threshold
Threshold values control the scope of datagram delivery. The threshold is the
minimum IP TTL required for a multicast datagram to be forwarded out a given
interface. DVMRP compares the TTL value of each multicast datagram to be
forwarded with the threshold configured for that interface. If the IP TTL is less
than the threshold value you specify, the datagram is dropped by the router.
For mrouted compatibility, multicast datagrams originated by the router have a
TTL of 1. These datagrams are not compared against the TTL. Unicast datagrams
originated by the router (for example, for route reports issued via a tunnel) have a
TTL of 255. A datagram that is to be forwarded through a tunnel is first compared
against the threshold and, if accepted, is then encapsulated in an IP datagram with
a TTL of 64.
By default, DVMRP uses a TTL value of 1. You can use Site Manager to specify a
TTL value from 1 to 254.
Table 4-1 lists the originating TTL values recommended for certain types of
multicast applications and the threshold values recommended for routers in order
to permit the forwarding of packets from these applications. These values are
recommended for topologies that will hook up to the MBone.
Site Manager: Threshold parameter: page A-8
Table 4-1. Recommended TTL and Threshold Values
Multicast Application TTL Threshold
IETF channel 1 low-rate GSM audio 255 224
IETF channel 2 low-rate GSM audio 223 192
IETF channel 1 PCM audio 191 160
IETF channel 2 PCM audio 159 128
IETF channel 1 video 127 96
IETF channel 2 video 95 64
Local event audio 63 32
Local event video 31 1
- 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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