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Customizing ST2 Services
114064 Rev. A 5-9
The ST2 agent on BayNet/ST2 1, using the information in the connection request:
1. Negotiates a hop identifier (HID) with the previous hop, ST2 1
2. Reserves the local and network resources required to support the stream
3. Passes the flowspec to the Bay Networks resource manager
Determining the Next Hop Downstream
An ST2 agent on a Bay Networks router uses two methods to determine the next
downstream hop in the stream:
• IP-inherited routing (the primary method), using the IP routing table
• ST2 exploratory routing (the backup method), using the ST2 neighbor table
Using the IP Routing Table (IP-Inherited Routing)
In IP-inherited routing, the ST2 agent obtains the address of the next-hop router
from the IP routing table. This table consists of entries describing routes that have
been learned by the routing protocols configured on the router (OSPF and BGP,
for example). The routing table also contains entries for static routes -- that is,
routes that have been inserted by the network administrator.
Each entry in the IP routing table includes a target IP network, a next-hop IP
address, an interface address, and other information. There is no information in a
routing table entry, however, to distinguish an ST2 route (that is, a hop with an
ST2-capable router on the other end). For this reason, it is possible for ST2 to
select a route that it cannot use.
If ST2 selects a route that is not ST2 capable (and does not provide a tunnel to an
ST2 agent), ST2 does not use the route and returns an SCMP REFUSE message
upstream with the reason code No Route to Destination.
If the required resources are not available via a path stored in the IP routing table,
ST2 uses exploratory routing. See “Using the ST2 Neighbor Table (Exploratory
Routing)” on page 5-10.
- 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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