Table 5-1 applies to the EIGRP con?¬?gurations on Router A in the EIGRP con?¬?guration example.
EIGRP sends updates out of the interfaces in networks 10.0.0.0 and 172.16.0.0. The updates include information about
networks 10.0.0.0 and 172.16.0.0 and any other networks that EIGRP learns.
EIGRP automatically summarizes routes at the classful boundary. In some cases, you might not
want automatic summarization to occur. For example, if you have discontiguous networks, you
need to disable automatic summarization to minimize router confusion. Figure 5-4 shows an
example of how this summarization can cause advertisements for the 172.16.0.0 network to be
sent from both Router A and Router B to Router C.
Figure 5-4 Autosummarization Causing Discontinuous Subnets
To disable automatic summarization, use the no auto-summary command in the EIGRP router
con?¬?guration mode. When this command is used, both Router A and Router B will advertise the
route speci?¬?c to the subnet of a given interface, as shown in Figure 5-5.
Table 5-1 EIGRP Command Example
Command Description
router eigrp 100 Enables the EIGRP routing process for AS 100
network 172.16.0.0 Associates network 172.
Pages:
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273