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ospf實(shí)驗(yàn)7:ospf特殊區(qū)域(文件)

 

【正文】 A3通告) 在看 R3 的 OSPF 數(shù)據(jù)庫(kù) R3sho ip ospf da OSPF Router with ID () (Process ID 10) Router Link States (Area 1) Link ID ADV Router Age Seq Checksum Link count 7 0x8000000A 0x00BEA6 2 6 0x80000008 0x005F04 2 Summary Net Link States (Area 1) Link ID ADV Router Age Seq Checksum 12 0x80000001 0x0075C0 12 0x80000004 0x00CD22 12 0x80000004 0x004E9 此時(shí)已經(jīng)沒有 Type5 AS External Link States 的 LSA 了。 在這個(gè)實(shí)驗(yàn)中,我們?cè)谏厦嬉呀?jīng)將 R3 配置成 stub area,只要在 R2 上配置 area1 成為Totally Stub Area 即可。 NSSA:允許外部路由通告到 OSPF,而同時(shí)保留其余部分的 Stub Area 特征。這時(shí) R2(即是 ABR也是 ASBR)通過 LSA7 向 R3 注入的外部路由。要注入默認(rèn)路由,需要如下配置: R2(configrouter)area 1 nssa defaultinformationoriginate 查看 R3 路由表 R3sho ip rou Codes: C connected, S static, R RIP, M mobile, B BGP D EIGRP, EX EIGRP external, O OSPF, IA OSPF inter area N1 OSPF NSSA external type 1, N2 OSPF NSSA external type 2 E1 OSPF external type 1, E2 OSPF external type 2 i ISIS, su ISIS summary, L1 ISIS level1, L2 ISIS level2 ia ISIS inter area, * candidate default, U peruser static route o ODR, P periodic downloaded static route Gateway of last resort is to work , 1 subs O IA [110/129] via , 00:04:06, Serial1/0 , 1 subs C is directly connected, Loopback0 , 1 subs O IA [110/128] via , 00:04:06, Serial1/0 , 1 subs C is directly connected, Serial1/0 O*N2 [110/1] via , 00:00:18, Serial1/0 有一條 ON2 的默認(rèn)路由了。 總結(jié): OSPF 的特殊區(qū)域可以總結(jié)成為下表: 區(qū)域類型 LSA1 LSA2 LSA3 LSA4 LSA5 LSA7 普通區(qū)域 ★ ★ ★ ★ ★ Stub ★ ★ ★ Totally Stub ★ ★ NSSA ★ ★ ★ ★ Totally NSSA ★ ★ ★ ★ 表示存在此種類型的 LSA 出自 博客 類別:原創(chuàng) 。配置如下: R2(configrouter)area 1 nssa nosummary 查看 R3 路由表: R3sho ip rou Codes: C connected, S static, R RIP, M mobile, B BGP D EIGRP, EX EIGRP external, O OSPF, IA OSPF inter area N1 OSPF NSSA external type 1, N2 OSPF NSSA external type 2 E1 OSPF external type 1, E2 OSPF external type 2 i ISIS, su ISIS summary, L1 ISIS level1, L2 ISIS level2 ia ISIS inter area, * candidate default, U peruser static route o ODR, P periodic downloaded static route Gateway of last resort is to work , 1 subs C is directly connected, Loopback0 , 1 subs C is directly connected, Serial1/0 O*IA [110/65] v
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