However, this dividing can cause problems because areas must remain
contiguous at all times. The routers in an area must always be capable of contacting and
receiving LSPs from all other routers in their area. In a multiarea design, an area router must
always have a path to the backbone, or it will have no connectivity to the rest of the network.
In addition, the backbone area must remain connected at all times to avoid some areas
becoming isolated (partitioned).
?– The con?¬?guration of link-state networks is usually simple, provided that the underlying
network architecture has been soundly designed. If the network design is complex, the
operation of the link-state protocol might have to be tuned to accommodate it.
?– During the initial discovery process, link-state routing protocols can ?¬‚ood the network with
LSPs and signi?¬?cantly decrease the capability of the network to transport data because no
traf?¬?c is passed until after the initial network convergence. This performance compromise is
122 Chapter 3: Medium-Sized Routed Network Construction
temporary but can be noticeable. Whether this ?¬‚ooding process will noticeably degrade
network performance depends on two things: the amount of available bandwidth and the
number of routers that must exchange routing information.
Pages:
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200