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Router A receives only one WF request and attempts to
allocate the bandwidth on the input interface, E0, and the output
interface, S0. For reservation requests, input and output interfaces
refer to the direction of the reservation request flow. The data
flow from the sources will reverse the direction of these
interfaces. For the following examples, assume the routers have the
resources to satisfy reservation requests. Since the request is a
shared reservation request, router A will allocate the largest of
the requested allocations. With only one request, the allocation
will equal what receiver 1 requested. The same argument applies to
routers C and D and receivers 2 and 3. Router C will allocate 300K
on the E0 and E1 interfaces, while router D will allocate 200K on
the E0 and E1 interfaces. Router A will receive one reservation
request on interface S2 for 500K and two reservation requests for
200K and 300K on interface E0. Router A will allocate 500K on
interface S2. The largest of the two requests, 300K, is received on
interface E0. On interfaces S0 and S1, Router A has to be able to
handle the largest of the three requests received. For this case, a
500K allocation is reserved on the S0 and S1 interfaces and the
reservation is forwarded toward the sources. Routers E and F only
receive an RSVP request for 500K. This amount will be allocated on
all interfaces between the sources and the receivers. The bandwidth
allocations for the WF example network in Figure 10-4 are listed in
Table 10-2. |
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