
Configuring IP Multicasting Services
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Using the ST2 Neighbor Table (Exploratory Routing)
In exploratory routing, the ST2 agent obtains information about its ST2-capable
neighbors from its ST2 neighbors table. This table, which is configured by the
network administrator, consists of entries that describe the characteristics of a
next-hop neighbor and provide the next-hop address.
The table notes those neighbors that can perform exploratory routing. When
resources are not available via a route stored in the IP routing table, the ST2 agent
selects a neighbor that is capable of exploratory routing.
Establishing a Connection with a Downstream Neighbor
Once the SCMP session has been established, the downstream intermediate agent
becomes the upstream agent for the next hop and issues a connect message. The
message contains an HID value and the flowspec for the stream.
How the Agent Adds a Target to a Stream
Once a stream has been established from the origin to a target, the origin can issue
additional connect requests to add targets to the stream. Each connect request
identifies the stream and specifies the target to add. In
Figure 5-4, for example,
target T4 has been added to the stream established between the video origin and
T6.
To create a new branch in the stream (if one is required), the intermediate ST2
agent follows the steps described in “Determining the Next Hop Downstream” on
page 5-9 and in the previous section, “Establishing a Connection with a
Downstream Neighbor.”
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