Avaya Configuring IP Multicasting Services Uživatelský manuál Strana 32
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Hodnocené. / 5. Na základě hodnocení zákazníků
Configuring IP Multicasting Services
3-2 114064 Rev. A
IGMP Concepts and Terminology
The Internet Group Management Protocol (IGMP) allows a host to register its
local network with the local router to receive any datagrams sent to this router and
targeted to a group with a specific IP multicast address. Bay Networks routers
support IGMP Version 2.
A router communicates with the hosts on a local network by sending IGMP
queries. Hosts respond by issuing IGMP reports.
IGMP Queries
A router running IGMP periodically sends host membership queries to its
attached local networks. Routers that conform to RFC 1112 generate Version 1
queries. Bay Networks routers configured with IGMP generate Version 2 queries.
If multiple IGMP routers exist on the network, routers designate one router to
send host member questions, using the following rules:
• Choose a router that generates Version 1 queries over a router that generates
Version 2 queries.
• Choose the router with the lowest IP address.
IGMP Host Reports
A host that receives a membership query from a local router can respond with a
host membership report, one report for each supported multicast group. A host
that receives a query delays its reply by a random interval and listens for a reply
from any other host in the same host group. Consider a network that includes two
host members -- Host A and Host B -- of the same multicast group. The router
sends out a host membership query on the local network. Host A and Host B both
receive the query and listen on the network for a host membership report. Host B’s
delay time expires first, so it responds to the query with a membership report.
Hearing the response, Host A does not send a report of its own for the same group.
Each query from a router to a host includes a code field. IGMP inserts a value -- d
-- into this field specifying the maximum time in tenths of a second within which
the host must issue a reply. The host uses this value to calculate a random value
between 0 and d tenths of a second for the period that it waits before sending a
response.
- 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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