router ospf 10 network I28.213.0.00.0.255.255 area l RTB# interface serial 0 p address I28.213.10.225.255.25.0 encapsulation frame-relay ip ospf network point-to-multipoint nterface serial I ip address I23.212.1.125.255.25.0 router ospf 10 network I28.213.0.00.0.255.255 area l network I23.212.0.00.0.255.255amea0 6. OSPF and route summarization (1)Inter-area route summarization(done on ABrs area <area-id> range <address> <mask> (2)External route summarization (effective only on ASBRs summary-address <ip-address> <mask> 例 RTa#. summan- address128.213.64.0255.255.224.0 redistribute bgp 50 metric 1000 subnets summar- address28.2l3.90.0255.255.2240 edistribute bgp 20 metric 1000 subnets 7. Stub area area <area-id> stub no summary area <area-id> defaul-cost <cost (cost default is 1) 8. Redistribute routes into ospf redistribute <protocol Process- idP metric <value> metric-type <value>l route-map <map-tag> subnets metric default is 20, except bgp is 1, metric-type default is 2) route-map <map-tag> [ deny llsequence-numberll 例:RTC作为ASBR,RTE为ospf内部路由器,两者通过 serial口互连,RTC 通过E0口连外部的16.16.160/24,12821300/16router ospf 10 network 128.213.0.0 0.0.255.255 area 1 RTB#: interface serial 0 ip address 128.213.10.2 255.255.255.0 encapsulation frame-relay ip ospf network point-to-multipoint interface serial 1 ip address 123.212.1.1 255.255.255.0 router ospf 10 network 128.213.0.0 0.0.255.255 area 1 network 123.212.0.0 0.0.255.255 area 0 6. OSPF and route summarization (1) Inter-area route summarization (done on ABRs) area <area-id> range <address> <mask> (2) External route summarization (effective only on ASBRs) summary-address <ip-address> <mask> 例： RTA#: summary-address 128.213.64.0 255.255.224.0 redistribute bgp 50 metric 1000 subnets RTB#: summary-address 128.213.96.0 255.255.224.0 redistribute bgp 20 metric 1000 subnets 7. Stub Area area <area-id> stub [no summary] area <area-id> defaul-cost <cost> (cost default is 1) 8. Redistribute routes into OSPF redistribute <protocol [process-id]> [metric <value>] [metric-type <value>] [route-map <map-tag>] [subnets] ( metric default is 20,except bgp is 1;metric-type default is 2) route-map <map-tag> [[permit]|[deny] |[sequence-number]] 例： RTC 作为 ASBR,RTE 为 ospf 内部路由器，两者通过 serial 口互连，RTC 通过 E0 口连外部的 16.16.16.0/24,128.213.0.0/16