Page of 424
Download Table of ContentsContents Print This PagePrint Bookmark

HP 5500 EI series Configuration Manual: Configuring Ospf Route Summarization

Hide thumbs
   
1
2
Table of Contents
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
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
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424

Advertisement

Enable OSPF.
Configure filters if routing information filtering is needed.

Configuring OSPF route summarization

Configure route summarization on an ABR or ASBR to summarize contiguous networks into a single
network and distribute it to other areas.
Route summarization reduces the routing information exchanged between areas and the size of routing
tables, and improves routing performance. For example, three internal networks 19.1.1.0/24,
19.1.2.0/24, and 19.1.3.0/24 are available within an area. You can summarize the three networks into
network 19.1.0.0/16, and advertise the summary network to other areas.
Configuring route summarization on an ABR
After you configure a summary route on an ABR, the ABR generates a summary LSA instead of more
specific LSAs so that the scale of LSDBs on routers in other areas and the influence of topology changes
are reduced.
To configure route summarization on an ABR:
Step
1.
Enter system view.
2.
Enter OSPF view.
3.
Enter OSPF area view.
4.
Configure ABR route
summarization.
Configuring route summarization when redistributing routes into OSPF on an ASBR
Without route summarization, an ASBR advertises each redistributed route in a separate ASE LSA. After
you configure a summary route, the ASBR advertises only the summary route in an ASE LSA instead of
more specific routes, reducing the number of LSAs in the LSDB.
The ASBR summarizes redistributed Type-5 LSAs that fall into the specified address range. If the ASBR is
in an NSSA area, it also summarizes Type-7 LSAs that fall into the specified address range. If the ASBR
is also the ABR, it summarizes Type-5 LSAs translated from Type-7 LSAs.
To configure route summarization when redistributing routes into OSPF on an ASBR:
Step
1.
Enter system view.
2.
Enter OSPF view.
3.
Configure ASBR route
summarization.
Command
system-view
ospf [ process-id | router-id router-id
| vpn-instance vpn-instance-name ] *
area area-id
abr-summary ip-address { mask |
mask-length } [ advertise |
not-advertise ] [ cost cost ]
Command
system-view
ospf [ process-id | router-id router-id
| vpn-instance vpn-instance-name ]*
asbr-summary ip-address { mask |
mask-length } [ cost cost |
not-advertise | nssa-only | tag tag ] *
73
Remarks
N/A
N/A
N/A
By default, no route summarization
is configured.
The command takes effect only on
an ABR.
Remarks
N/A
N/A
By default, no ASBR route
summarization is configured.
The command takes effect only on an
ASBR.

Advertisement

   Related Manuals for HP 5500 EI series

This manual also for:

5500 si series

Comments to this Manuals

Symbols: 0
Latest comments: