I have 2 equal cost path links between PeerA and PeerB and all its interfaces are participating in the same OSPF area.
When i redistribute a static route (172.16.2.0/24) from PeerB to A, does the adverting router generate only 1 x external LSA and send it down from just 1 of the 2 links to the receiving peer? or the same external LSA will be send via both links to the receiving peer?
Reason for asking this is because i am only seeing 1 entry in PeerA for the external LSA even though in the RIB , there are 2 x OE2 routes to the redistributed network (172.16.2.0)
PeerA#show ip ospf database external adv-router 0.0.0.2 OSPF Router with ID (0.0.0.1) (Process ID 1) Type-5 AS External Link States Routing Bit Set on this LSA in topology Base with MTID 0 LS age: 502 Options: (No TOS-capability, No DC) LS Type: AS External Link Link State ID: 172.16.2.0 (External Network Number ) Advertising Router: 0.0.0.2 LS Seq Number: 80000003 Checksum: 0x9B6A Length: 36 Network Mask: /24 Metric Type: 2 (Larger than any link state path) MTID: 0 Metric: 10 Forward Address: 0.0.0.0 External Route Tag: 0
Only 1 x External LSA shown in the OSPF database as above, but 2 x OE2 routes in the RIB.
RouterA#show ip route ospf Codes: L - local, 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 - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP + - replicated route, % - next hop override Gateway of last resort is not set 172.16.0.0/24 is subnetted, 3 subnets O E2 172.16.2.0 [110/10] via 18.104.22.168, 00:11:04, GigabitEthernet1/0/6 [110/10] via 100.100.100.101, 00:01:32, GigabitEthernet1/0/5