#?5類LSA?：外部路由前綴?+?ASBR的router_id
IOU5#sh?ip?ospf?data?extOSPF?Router?with?ID?(5.5.5.5)?(Process?ID?1)Type-5?AS?External?Link?StatesLS?age:?71Options:?(No?TOS-capability,?DC,?Upward)LS?Type:?AS?External?LinkLink?State?ID:?10.1.55.0?(External?Network?Number?)Advertising?Router:?5.5.5.5LS?Seq?Number:?80000002Checksum:?0x61E7Length:?36Network?Mask:?/24Metric?Type:?2?(Larger?than?any?link?state?path)MTID:?0?Metric:?20??#?種子metricForward?Address:?0.0.0.0External?Route?Tag:?0#?區域內路由OE?T5?+?T1/T2
IOU4#?sh?ip?ospf?data?OSPF?Router?with?ID?(4.4.4.4)?(Process?ID?1)Router?Link?States?(Area?0)
Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum?Link?count
2.2.2.2?????????2.2.2.2?????????1?????(DNA)?0x80000005?0x00EBE8?1
3.3.3.3?????????3.3.3.3?????????1?????(DNA)?0x80000005?0x00AD1E?1
4.4.4.4?????????4.4.4.4?????????294?????????0x80000006?0x00F05A?4
5.5.5.5?????????5.5.5.5?????????211?????????0x80000004?0x006863?3Type-5?AS?External?Link?States
Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum?Tag
10.1.55.0???????5.5.5.5?????????211?????????0x80000003?0x005FE8?0IOU4#sh?ip?ro?10.1.55.55
Routing?entry?for?10.1.55.0/24Known?via?"ospf?1",?distance?110,?metric?20,?type?extern?2,?forward?metric?64Last?update?from?10.1.45.5?on?Serial2/1,?01:15:51?agoRouting?Descriptor?Blocks:*?10.1.45.5,?from?5.5.5.5,?01:15:51?ago,?via?Serial2/1Route?metric?is?20,?traffic?share?count?is?1
#?4類LSA：?ASBR的router_id?+?本區域ABR的router_id?
IOU1#sh?ip?ospf?da?asbr-summary?OSPF?Router?with?ID?(1.1.1.1)?(Process?ID?1)Summary?ASB?Link?States?(Area?2)Routing?Bit?Set?on?this?LSA?in?topology?Base?with?MTID?0LS?age:?840Options:?(No?TOS-capability,?DC,?Upward)LS?Type:?Summary?Links(AS?Boundary?Router)Link?State?ID:?5.5.5.5?(AS?Boundary?Router?address)Advertising?Router:?2.2.2.2LS?Seq?Number:?80000003Checksum:?0x5944Length:?28Network?Mask:?/0MTID:?0?	Metric:?128?Routing?Bit?Set?on?this?LSA?in?topology?Base?with?MTID?0LS?age:?814Options:?(No?TOS-capability,?DC,?Upward)LS?Type:?Summary?Links(AS?Boundary?Router)Link?State?ID:?5.5.5.5?(AS?Boundary?Router?address)Advertising?Router:?3.3.3.3LS?Seq?Number:?80000003Checksum:?0x3B5ELength:?28Network?Mask:?/0MTID:?0?	Metric:?128?#?域間路由：?T5?+?T4?+?T1/T2
IOU1#sh?ip?ospf?da?OSPF?Router?with?ID?(1.1.1.1)?(Process?ID?1)Router?Link?States?(Area?2)
Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum?Link?count
1.1.1.1?????????1.1.1.1?????????751?????????0x80000004?0x00E906?2
2.2.2.2?????????2.2.2.2?????????783?????????0x80000007?0x008C74?1
3.3.3.3?????????3.3.3.3?????????756?????????0x80000007?0x004EA9?1Summary?ASB?Link?States?(Area?2)
Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum
5.5.5.5?????????2.2.2.2?????????783?????????0x80000003?0x005944
5.5.5.5?????????3.3.3.3?????????756?????????0x80000003?0x003B5EType-5?AS?External?Link?States
Link?ID?????????ADV?Router??????Age?????????Seq#???????Checksum?Tag
10.1.55.0???????5.5.5.5?????????727?????????0x80000003?0x005FE8?0
#?5類LSA的外部路由OE2選擇：?#?1、外部路由的metric小優先
IOU1(config-router)#redistribute?connected?route-map?loop?metric?10
IOU4#????sh?ip?ro
O?E2?????10.1.55.0/24?[110/10]?via?10.1.234.3,?00:00:03,?Serial2/0[110/10]?via?10.1.234.2,?00:00:03,?Serial2/0
IOU4#sh?ip?ro?10.1.55.55
Routing?entry?for?10.1.55.0/24Known?via?"ospf?1",?distance?110,?metric?10,?type?extern?2,?forward?metric?74Last?update?from?10.1.234.2?on?Serial2/0,?00:04:44?agoRouting?Descriptor?Blocks:*?10.1.234.3,?from?1.1.1.1,?00:04:44?ago,?via?Serial2/0Route?metric?is?10,?traffic?share?count?is?110.1.234.2,?from?1.1.1.1,?00:04:44?ago,?via?Serial2/0Route?metric?is?10,?traffic?share?count?is?1#?2、外部路由的metric相等，forward?metric小優先；
IOU1(config-router)#redistribute?connected?route-map?loop?metric?20IOU4#????sh?ip?ro