101
ROUTING PROTOCOLS
e FSR concept originates from the global state routing (GSR)
protocol. GSR can be viewed as a special case of FSR in which there
is only one fisheye scope level. As a result, the entire topology table
is exchanged among neighbors. Clearly, this consumes a considerable
amount of bandwidth when network size becomes large. rough
updating link-state information with different frequencies, depending
on the scope distance, FSR scales well to large network size and keeps
overhead low without compromising route computation accuracy
when the destination is near.
By retaining a routing entry for each destination, FSR avoids the
extra work of “finding” the destination (as in on-demand routing) and
thus maintains low single-packet tr ...