OSPF: Summarization at ASBR

R1 is the ASBR, R1 is redistributing Static routes into OSPF networks. Summarization has to be done at R1 to optimize the routing table. Before summarization: R2#sh ip route ospf 172.16.0.0/24 is subnetted, 4 subnets O E2    172.16.0.0 [110/200] via 172.30.0.1, 00:00:01, FastEthernet0/0 O E2    172.16.1.0 [110/200] via 172.30.0.1, 00:00:06, FastEthernet0/0 O E2    172.16.2.0 [110/200] … Continue reading OSPF: Summarization at ASBR

OSPF: Summarization at ABR

Unlike EIGRP, summarization can  only be done at ABR and ASBR. Before summarization R2 is the ABR of Area 0 and 10 R2#sh ip route Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter … Continue reading OSPF: Summarization at ABR