hi all, I was reading some articiles on forwarding address in OSPF but have small doubt
Please see attached diagram.
R3 has static route to 1.1.1.1 and redistributing it into OSPF area 0
between R2 and R3,
so, R2 gets route 1.1.1.1 with forwarding address of 0.0.0.0.
in order to make next hop as 10.0.123.1 on R2 for route 1.1.1.1, we need to
put one interface into OSPF on R3.
But adjacency is not required as per articles
So i get LSA on R2 for 1.1.1.1 and forwarding address of 10.0.123.1, but
this doesnt get intsalled into RIB until unless I run OSPF between R2 and R3
over subnet 10.0.123.0.
Please see my configs...I am doing something wrong ? or adjaceny between R2
and R3 is required over 10.0.123.0
As you can see below, its in Database but not in RIB
R2#sh run | s ospf
router ospf 1
log-adjacency-changes
network 10.0.23.0 0.0.0.255 area 0
R2#sh ip os da ex 1.1.1.1
OSPF Router with ID (10.0.123.2) (Process ID 1)
Type-5 AS External Link States
LS age: 393
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 1.1.1.1 (External Network Number )
Advertising Router: 10.0.123.3
LS Seq Number: 80000002
Checksum: 0xACDF
Length: 36
Network Mask: /32
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 10.0.123.1
External Route Tag: 0
R2#sh ip ro
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 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
Gateway of last resort is not set
10.0.0.0/24 is subnetted, 2 subnets
C 10.0.23.0 is directly connected, FastEthernet0/5
C 10.0.123.0 is directly connected, FastEthernet0/2
R2#
R2#sh run | s ospf
router ospf 1
log-adjacency-changes
network 10.0.23.0 0.0.0.255 area 0
R2#
R3#sh run | s ospf
router ospf 1
log-adjacency-changes
redistribute static subnets
network 10.0.23.0 0.0.0.255 area 0
network 10.0.123.0 0.0.0.255 area 0
R3#
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