
Customizing ST2 Services
114064 Rev. B 5-7
The Role of an ST2 Intermediate Agent
This section examines the role played by an intermediate ST2 agent running on a
Bay Networks router in an ST2 environment.
How the Agent Sets Up a Stream Segment
As part of ST2 stream setup, a Bay Networks router configured as an intermediate
agent
1. Receives an SCMP connect request from an upstream ST2 neighbor
2. Establishes a connection with the upstream neighbor
3. Determines the appropriate downstream neighbor
4. Reserves resources on the downstream interface
5. Sends an SCMP connection request to the downstream neighbor
6. Establishes a connection with the downstream neighbor
Stream setup creates a semblance of an end-to-end connection establishment
typical of a virtual circuit protocol. However, control messages are never
exchanged directly between origin and targets.
Receiving a Connect Request from Upstream
An intermediate ST agent receives connect requests on ST2 interfaces from
upstream agents. A connect request can specify a single target (the typical case) or
multiple targets. In F
igure 5-3, for example, BayNet/ST2 1, an intermediate agent,
receives a connect request from ST2 1. The connect request specifies a single
target for the stream, T6. The request also includes a flowspec listing the network
resources required for the transmission.
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