ASN 65538 ASN 65539 OSPF BGP ASN 100

ASN 65538 ASN 65539 OSPF BGP ASN 100 OSPF ASN 200

CASE. 1 IOU 4: redistribute bgp 65339 metric 200 metric-type 1 subnets IOU 5: redistribute bgp 200 metric 190 metric-type 1 subnets IOU 6#show ip ospf database external topology OSPF Router with ID (200. 1. 1. 1) (Process ID 40) Base Topology (MTID 0) Type-5 AS External Link States Routing Bit Set on this LSA in topology Base with MTID 0 LS age: 271 Options: (No TOS-capability, DC, Upward) LS Type: AS External Link State ID: 100. 1. 1. 0 (External Network Number ) Advertising Router: 40. 23. 1. 2 LS Seq Number: 80000001 Checksum: 0 x. B 8 B 0 Length: 36 Network Mask: /24 Metric Type: 1 (Comparable directly to link state metric) MTID: 0 Metric: 190 Forward Address: 0. 0 External Route Tag: 100 LS age: 535 Options: (No TOS-capability, DC, Upward) LS Type: AS External Link State ID: 100. 1. 1. 0 (External Network Number ) Advertising Router: 40. 60. 1. 1 LS Seq Number: 80000002 Checksum: 0 x 163 Length: 36 Network Mask: /24 Metric Type: 1 (Comparable directly to link state metric) MTID: 0 Metric: 200 Forward Address: 0. 0 External Route Tag: 65338 IOU 6#show ip rou 100. 1. 1. 1 Routing entry for 100. 1. 1. 0/24 Known via "ospf 40", distance 110, metric 200 Tag 100, type extern 1 Last update from 40. 50. 1. 1 on Ethernet 0/1, 00: 05: 19 ago Routing Descriptor Blocks: * 40. 50. 1. 1, from 40. 23. 1. 2, 00: 05: 19 ago, via Ethernet 0/1 Route metric is 200, traffic share count is 1 Route tag 100 ※ Routing path toward 100. 1. 1. 0/24 had chosen out interface Ethernet 0/1 on IOU 6. Can be seen two routers are advertising the network 100. 1. 1. 0/24 with different metric

CASE. 2 IOU 4: redistribute bgp 65339 metric 200 metric-type 1 subnets IOU 5: redistribute bgp 200 metric 220 metric-type 1 subnets IOU 6#show ip ospf database external topology OSPF Router with ID (200. 1. 1. 1) (Process ID 40) Base Topology (MTID 0) Type-5 AS External Link States LS age: 47 Options: (No TOS-capability, DC, Upward) LS Type: AS External Link State ID: 100. 1. 1. 0 (External Network Number ) Advertising Router: 40. 23. 1. 2 LS Seq Number: 80000002 Checksum: 0 x. E 366 Length: 36 Network Mask: /24 Metric Type: 1 (Comparable directly to link state metric) MTID: 0 Metric: 220 Forward Address: 0. 0 External Route Tag: 100 Routing Bit Set on this LSA in topology Base with MTID 0 LS age: 997 Options: (No TOS-capability, DC, Upward) LS Type: AS External Link State ID: 100. 1. 1. 0 (External Network Number ) Advertising Router: 40. 60. 1. 1 LS Seq Number: 80000002 Checksum: 0 x 163 Length: 36 Network Mask: /24 Metric Type: 1 (Comparable directly to link state metric) MTID: 0 Metric: 200 Forward Address: 0. 0 External Route Tag: 65338 IOU 6#show ip rou 100. 1. 1. 1 Routing entry for 100. 1. 1. 0/24 Known via "ospf 40", distance 110, metric 210 Tag 65338, type extern 1 Last update from 40. 60. 1. 1 on Ethernet 0/0, 00: 02: 04 ago Routing Descriptor Blocks: * 40. 60. 1. 1, from 40. 60. 1. 1, 00: 02: 04 ago, via Ethernet 0/0 Route metric is 210, traffic share count is 1 Route tag 65338 ※ Routing path toward 100. 1. 1. 0/24 had chosen out interface Ethernet 0/0 on IOU 5. Can be seen two routers are advertising the network 100. 1. 1. 0/24 with different metric