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Customizing ST2 Services
114064 Rev. A 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.
SCMP(ERROR IN RESPONSE) yes yes
SCMP(HELLO) yes yes
SCMP(HID-CHANGE) yes yes
SCMP(HID-APPROVE) yes yes
SCMP(HID-REJECT) yes yes
SCMP(HID-CHANGE-REQUEST) yes no
SCMP(NOTIFY) yes no
SCMP(REFUSE) yes yes
SCMP(STATUS) yes no
SCMP(STATUS-RESPONSE) yes no
SCMP (OPCODE 18:userdata) no yes
Table 5-1. ST2 Features
(continued)
Feature RFC 1190 Bay Networks
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