MPLS OSPF Domain-ID

Issue

How the OSPF Process ID and the OSPF Domain-ID does affect routing?

Configuration

We will start with basic MPLS L3 VPN configuration with OSPF as the PE-CE routing protocol

R1

R1#sh run int f0/0

interface FastEthernet0/0

 ip address 192.1.15.1 255.255.255.0

 speed 100

 full-duplex

 mpls ip

R1#sh run int f0/1

interface FastEthernet0/1

 ip vrf forwarding RED

 ip address 192.1.14.1 255.255.255.0

 speed 100

 full-duplex

R1#sh run int f1/0

interface FastEthernet1/0

 ip vrf forwarding BLUE

 ip address 192.1.17.1 255.255.255.0

 speed 100

 full-duplex

R1#sh run int lo0

interface Loopback0

 ip address 1.1.1.1 255.255.255.255

ip vrf BLUE

 rd 150:10

 route-target export 150:10

 route-target import 150:10

ip vrf RED

 rd 300:10

 route-target export 300:10

 route-target import 300:10

R1#sh run | sec router ospf

router ospf 300 vrf RED

 router-id 192.1.14.1

 log-adjacency-changes

 redistribute bgp 10 subnets

 network 192.1.14.1 0.0.0.0 area 0

router ospf 150 vrf BLUE

 router-id 192.1.17.1

 log-adjacency-changes

 redistribute bgp 10 subnets

 network 192.1.17.1 0.0.0.0 area 0

router ospf 1

 router-id 1.1.1.1

 log-adjacency-changes

 network 1.1.1.1 0.0.0.0 area 0

 network 192.1.15.1 0.0.0.0 area 0

R1#sh run | sec router bgp

router bgp 10

 no synchronization

 bgp log-neighbor-changes

 neighbor 3.3.3.3 remote-as 10

 neighbor 3.3.3.3 update-source Loopback0

 no auto-summary

 !

 address-family vpnv4

  neighbor 3.3.3.3 activate

  neighbor 3.3.3.3 send-community both

 exit-address-family

 !

 address-family ipv4 vrf RED

  redistribute ospf 300 vrf RED

  no synchronization

 exit-address-family

 !

 address-family ipv4 vrf BLUE

  redistribute ospf 150 vrf BLUE

  no synchronization

 exit-address-family

mpls label protocol ldp

mpls ldp router-id Loopback0 force

R2

R2#sh run int f0/0

interface FastEthernet0/0

 ip address 192.1.25.2 255.255.255.0

 speed 100

 full-duplex

 mpls ip

R2#sh run int f0/1

interface FastEthernet0/1

 no ip address

 shutdown

 duplex auto

 speed auto

R2#sh run int s0/0

interface Serial0/0

 ip address 192.1.23.2 255.255.255.0

 encapsulation frame-relay

 ip ospf network point-to-multipoint

 mpls ip

 clock rate 64000

 frame-relay map ip 192.1.23.3 203 broadcast

 no frame-relay inverse-arp

R2#sh run int lo0

interface Loopback0

 ip address 2.2.2.2 255.255.255.255

R2#sh run | sec router ospf

router ospf 1

 router-id 2.2.2.2

 log-adjacency-changes

 network 2.2.2.2 0.0.0.0 area 0

 network 192.1.23.2 0.0.0.0 area 0

 network 192.1.25.2 0.0.0.0 area 0

R2#sh run | inc ldp

mpls label protocol ldp

mpls ldp router-id Loopback0 force

R3#sh run int f0/0

interface FastEthernet0/0

 ip vrf forwarding RED

 ip address 192.1.36.3 255.255.255.0

 speed 100

 full-duplex

R3

R3#sh run int f0/1

interface FastEthernet0/1

 ip vrf forwarding BLUE

 ip address 192.1.38.3 255.255.255.0

 speed 100

 full-duplex

R3#sh run int ser0/0

interface Serial0/0

 ip address 192.1.23.3 255.255.255.0

 encapsulation frame-relay

 ip ospf network point-to-multipoint

 mpls ip

 clock rate 64000

 frame-relay map ip 192.1.23.2 302 broadcast

 no frame-relay inverse-arp

R3#sh run int lo0

interface Loopback0

 ip address 3.3.3.3 255.255.255.255

end

ip vrf BLUE

 rd 150:10

 route-target export 150:10

 route-target import 150:10

ip vrf RED

 rd 300:10

 route-target export 300:10

 route-target import 300:10

R3#sh run | sec router ospf

router ospf 300 vrf RED

 router-id 192.1.36.3

 log-adjacency-changes

 redistribute bgp 10 subnets

 network 192.1.36.3 0.0.0.0 area 0

router ospf 150 vrf BLUE

 router-id 192.1.38.3

 log-adjacency-changes

 redistribute bgp 10 subnets

 network 192.1.38.3 0.0.0.0 area 0

router ospf 1

 router-id 3.3.3.3

 log-adjacency-changes

 network 3.3.3.3 0.0.0.0 area 0

 network 192.1.23.3 0.0.0.0 area 0

R3#sh run | sec router bgp

router bgp 10

 no synchronization

 bgp log-neighbor-changes

 neighbor 1.1.1.1 remote-as 10

 neighbor 1.1.1.1 update-source Loopback0

 no auto-summary

 !

 address-family vpnv4

  neighbor 1.1.1.1 activate

  neighbor 1.1.1.1 send-community both

 exit-address-family

 !

 address-family ipv4 vrf RED

  redistribute ospf 300 vrf RED

  no synchronization

 exit-address-family

 !

 address-family ipv4 vrf BLUE

  redistribute ospf 150 vrf BLUE

  no synchronization

 exit-address-family

R3#sh run | inc ldp

mpls label protocol ldp

mpls ldp router-id Loopback0 force

R4

R4#sh run int f0/0

interface FastEthernet0/0

 ip address 192.1.14.4 255.255.255.0

 speed 100

 full-duplex

R4#sh run int lo0

interface Loopback0

 ip address 4.4.4.4 255.255.255.255

R4#sh run | sec router ospf

router ospf 300

 router-id 4.4.4.4

 log-adjacency-changes

 network 4.4.4.4 0.0.0.0 area 0

 network 192.1.14.4 0.0.0.0 area 0

R5

R5#sh run int f0/0

interface FastEthernet0/0

 ip address 192.1.15.5 255.255.255.0

 speed 100

 full-duplex

 mpls ip

R5#sh run int f0/1

interface FastEthernet0/1

 ip address 192.1.25.5 255.255.255.0

 speed 100

 full-duplex

 mpls ip

R5#sh run int lo0

interface Loopback0

 ip address 5.5.5.5 255.255.255.255

R5#sh run | sec router ospf

router ospf 1

 router-id 5.5.5.5

 log-adjacency-changes

 network 5.5.5.5 0.0.0.0 area 0

 network 192.1.15.5 0.0.0.0 area 0

 network 192.1.25.5 0.0.0.0 area 0

R5#sh run | inc ldp

mpls label protocol ldp

mpls ldp router-id Loopback0 force

R6

R6#sh run int f0/0

interface FastEthernet0/0

 ip address 192.1.36.6 255.255.255.0

 speed 100

 full-duplex

R6#sh run int lo0

interface Loopback0

 ip address 6.6.6.6 255.255.255.255

R6#sh run | sec router ospf

router ospf 300

 router-id 6.6.6.6

 log-adjacency-changes

 network 6.6.6.6 0.0.0.0 area 0

 network 192.1.36.6 0.0.0.0 area 0

R7

R7#sh run int f0/0

interface FastEthernet0/0

 ip address 192.1.17.7 255.255.255.0

 speed 100

 full-duplex

R7#sh run int lo0

interface Loopback0

 ip address 7.7.7.7 255.255.255.255

R7#sh run | sec router ospf

router ospf 150

 router-id 7.7.7.7

 log-adjacency-changes

 network 7.7.7.7 0.0.0.0 area 0

 network 192.1.17.7 0.0.0.0 area 0

R8

R8#sh run int f0/0

interface FastEthernet0/0

 ip address 192.1.38.8 255.255.255.0

 speed 100

 full-duplex

R8#sh run int lo0

interface Loopback0

 ip address 8.8.8.8 255.255.255.255

R8#sh run | sec router ospf

router ospf 150

 router-id 8.8.8.8

 log-adjacency-changes

 network 8.8.8.8 0.0.0.0 area 0

 network 192.1.38.8 0.0.0.0 area 0

Verification

R4#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface

192.1.14.1        1   FULL/DR         00:00:32    192.1.14.1      FastEthernet0/0

R4#sh ip route ospf

     6.0.0.0/32 is subnetted, 1 subnets

O IA    6.6.6.6 [110/12] via 192.1.14.1, 00:14:18, FastEthernet0/0

O IA 192.1.36.0/24 [110/2] via 192.1.14.1, 00:14:33, FastEthernet0/0

R4#ping 6.6.6.6 source loopback 0

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds:

Packet sent with a source address of 4.4.4.4

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/17/20 ms

R4#sh ip ospf database

            OSPF Router with ID (4.4.4.4) (Process ID 300)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count

4.4.4.4         4.4.4.4         1247        0x80000003 0x00A6A4 2

192.1.14.1      192.1.14.1      1250        0x80000002 0x0030BB 1

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum

192.1.14.1      192.1.14.1      1250        0x80000001 0x008C2B

                Summary Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum

6.6.6.6         192.1.14.1      902         0x80000001 0x0024A4

192.1.36.0      192.1.14.1      917         0x80000001 0x007193

R6#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface

192.1.36.3        1   FULL/BDR        00:00:38    192.1.36.3      FastEthernet0/0

R6#sh ip route ospf

O IA 192.1.14.0/24 [110/11] via 192.1.36.3, 00:16:04, FastEthernet0/0

     4.0.0.0/32 is subnetted, 1 subnets

O IA    4.4.4.4 [110/12] via 192.1.36.3, 00:16:04, FastEthernet0/0

R6#ping 4.4.4.4 source loopback 0

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:

Packet sent with a source address of 6.6.6.6

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/16/16 ms

R6#sh ip ospf database

            OSPF Router with ID (6.6.6.6) (Process ID 300)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count

6.6.6.6         6.6.6.6         978         0x80000003 0x00896D 2

192.1.36.3      192.1.36.3      979         0x80000003 0x005727 1

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum

192.1.36.6      6.6.6.6         978         0x80000001 0x006CC8

                Summary Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum

4.4.4.4         192.1.36.3      1212        0x80000001 0x007F42

192.1.14.0      192.1.36.3      1212        0x80000001 0x00BD45

R7#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface

192.1.17.1        1   FULL/DR         00:00:37    192.1.17.1      FastEthernet0/0

R7#sh ip rou

R7#sh ip route os

R7#sh ip route ospf

O IA 192.1.38.0/24 [110/2] via 192.1.17.1, 00:16:17, FastEthernet0/0

     8.0.0.0/32 is subnetted, 1 subnets

O IA    8.8.8.8 [110/3] via 192.1.17.1, 00:16:01, FastEthernet0/0

R7#ping 8.8.8.8 source loopback 0

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:

Packet sent with a source address of 7.7.7.7

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/17/20 ms

R7#sh ip ospf database

            OSPF Router with ID (7.7.7.7) (Process ID 150)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count

7.7.7.7         7.7.7.7         1105        0x80000003 0x0025F8 2

192.1.17.1      192.1.17.1      1106        0x80000002 0x003CA3 1

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum

192.1.17.1      192.1.17.1      1106        0x80000001 0x00089A

                Summary Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum

8.8.8.8         192.1.17.1      973         0x80000001 0x00586E

192.1.38.0      192.1.17.1      989         0x80000001 0x0046B9

R8#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface

192.1.38.3        1   FULL/BDR        00:00:38    192.1.38.3      FastEthernet0/0

R8#sh ip route ospf   

     7.0.0.0/32 is subnetted, 1 subnets

O IA    7.7.7.7 [110/3] via 192.1.38.3, 00:16:42, FastEthernet0/0

O IA 192.1.17.0/24 [110/2] via 192.1.38.3, 00:16:42, FastEthernet0/0

R8#ping 7.7.7.7 source loopback 0

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 7.7.7.7, timeout is 2 seconds:

Packet sent with a source address of 8.8.8.8

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/16/20 ms

R8#sh ip ospf database

            OSPF Router with ID (8.8.8.8) (Process ID 150)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count

8.8.8.8         8.8.8.8         1015        0x80000003 0x004F90 2

192.1.38.3      192.1.38.3      1015        0x80000004 0x00CEAD 1

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum

192.1.38.8      8.8.8.8         1015        0x80000001 0x0064BA

                Summary Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum

7.7.7.7         192.1.38.3      1106        0x80000001 0x00E6CC

192.1.17.0      192.1.38.3      1256        0x80000001 0x008E6F

R1#sh ip route vrf RED

Routing Table: RED

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

C    192.1.14.0/24 is directly connected, FastEthernet0/1

     4.0.0.0/32 is subnetted, 1 subnets

O       4.4.4.4 [110/2] via 192.1.14.4, 00:22:48, FastEthernet0/1

     6.0.0.0/32 is subnetted, 1 subnets

B       6.6.6.6 [200/11] via 3.3.3.3, 00:17:05

B    192.1.36.0/24 [200/0] via 3.3.3.3, 00:17:20

R1#sh ip route vrf BLUE

Routing Table: BLUE

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

     7.0.0.0/32 is subnetted, 1 subnets

O       7.7.7.7 [110/2] via 192.1.17.7, 00:19:01, FastEthernet1/0

B    192.1.38.0/24 [200/0] via 3.3.3.3, 00:17:08

     8.0.0.0/32 is subnetted, 1 subnets

B       8.8.8.8 [200/2] via 3.3.3.3, 00:16:53

C    192.1.17.0/24 is directly connected, FastEthernet1/0

R1#ping vrf RED 6.6.6.6

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 12/12/16 ms

R1#ping vrf RED 4.4.4.4

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms

R1#ping vrf BLUE 7.7.7.7

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 7.7.7.7, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/4 ms

R1#ping vrf BLUE 8.8.8.8

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 12/12/12 ms

R1#sh bgp vpnv4 unicast all summary

BGP router identifier 1.1.1.1, local AS number 10

BGP table version is 20, main routing table version 20

8 network entries using 1096 bytes of memory

8 path entries using 544 bytes of memory

9/8 BGP path/bestpath attribute entries using 1116 bytes of memory

4 BGP extended community entries using 160 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 2916 total bytes of memory

BGP activity 9/1 prefixes, 9/1 paths, scan interval 15 secs

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd

3.3.3.3         4    10      36      31       20    0    0 00:22:08        4

R1#sh bgp vpnv4 unicast all

BGP table version is 20, local router ID is 1.1.1.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path

Route Distinguisher: 150:10 (default for vrf BLUE)

*> 7.7.7.7/32       192.1.17.7               2         32768 ?

*>i8.8.8.8/32       3.3.3.3                  2    100      0 ?

*> 192.1.17.0       0.0.0.0                  0         32768 ?

*>i192.1.38.0       3.3.3.3                  0    100      0 ?

Route Distinguisher: 300:10 (default for vrf RED)

*> 4.4.4.4/32       192.1.14.4               2         32768 ?

*>i6.6.6.6/32       3.3.3.3                 11    100      0 ?

*> 192.1.14.0       0.0.0.0                  0         32768 ?

*>i192.1.36.0       3.3.3.3                  0    100      0 ?

R1#sh mpls interfaces

Interface              IP            Tunnel   Operational

FastEthernet0/0        Yes (ldp)     No       Yes       

R1#sh mpls ldp neighbor

    Peer LDP Ident: 5.5.5.5:0; Local LDP Ident 1.1.1.1:0

        TCP connection: 5.5.5.5.60478 - 1.1.1.1.646

        State: Oper; Msgs sent/rcvd: 36/36; Downstream

        Up time: 00:22:34

        LDP discovery sources:

          FastEthernet0/0, Src IP addr: 192.1.15.5

        Addresses bound to peer LDP Ident:

          192.1.15.5      192.1.25.5      5.5.5.5  

R1#sh bgp vpnv4 unicast all neighbors 3.3.3.3 advertised-routes

BGP table version is 20, local router ID is 1.1.1.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path

Route Distinguisher: 150:10 (default for vrf BLUE)

*> 7.7.7.7/32       192.1.17.7               2         32768 ?

*> 192.1.17.0       0.0.0.0                  0         32768 ?

Route Distinguisher: 300:10 (default for vrf RED)

*> 4.4.4.4/32       192.1.14.4               2         32768 ?

*> 192.1.14.0       0.0.0.0                  0         32768 ?

Total number of prefixes 4

Now , as we can see from the outputs above that CEs receive routes as IA routes and that is because the Domain IDs values are the same which are derived from the process IDs

R1#sh ip ospf | inc 150

 Routing Process "ospf 150" with ID 192.1.17.1

   Domain ID type 0x0005, value 0.0.0.150

R1#sh ip ospf | inc 300

 Routing Process "ospf 300" with ID 192.1.14.1

Now, let us configure the domain IDs value on our PEs: R1 and R3 and see the effect

R4#sh ip route 6.6.6.6

Routing entry for 6.6.6.6/32

  Known via "ospf 300", distance 110, metric 12, type inter area

  Last update from 192.1.14.1 on FastEthernet0/0, 00:23:11 ago

  Routing Descriptor Blocks:

  * 192.1.14.1, from 192.1.14.1, 00:23:11 ago, via FastEthernet0/0

      Route metric is 12, traffic share count is 1

R1(config)#router ospf 300 vrf RED

R1(config-router)#domain-id 0.0.0.60

R1(config-router)#router ospf 150 vrf BLUE

R1(config-router)#domain-id 0.0.0.50  

  

R1#clear ip ospf process

Reset ALL OSPF processes? [no]: yes

R3(config)#router ospf 300 vrf RED

R3(config-router)#domain-id 0.0.0.60

R3(config-router)#router ospf 150 vrf BLUE

R3(config-router)#domain-id 0.0.0.50     

R3#clear ip ospf process

Reset ALL OSPF processes? [no]: yes

R1#sh ip ospf | inc 150

Routing Process "ospf 150" with ID 192.1.17.1

   Domain ID type 0x0005, value 0.0.0.50

 Routing Process "ospf 300" with ID 192.1.14.1

   Domain ID type 0x0005, value 0.0.0.60

R1#sh ip ospf | inc 150

 Routing Process "ospf 150" with ID 192.1.38.3

   Domain ID type 0x0005, value 0.0.0.50

 Routing Process "ospf 300" with ID 192.1.36.3

   Domain ID type 0x0005, value 0.0.0.60

R4#sh ip route ospf | inc 6.6.6.6

O IA    6.6.6.6 [110/12] via 192.1.14.1, 00:00:59, FastEthernet0/0

R4#sh ip route 6.6.6.6     

Routing entry for 6.6.6.6/32

  Known via "ospf 300", distance 110, metric 12, type inter area

  Last update from 192.1.14.1 on FastEthernet0/0, 00:01:17 ago

  Routing Descriptor Blocks:

  * 192.1.14.1, from 192.1.14.1, 00:01:17 ago, via FastEthernet0/0

      Route metric is 12, traffic share count is 1

All is the same till now, let us change the domain IDs and the process IDs are the same on both PEs and CEs (we will work on vrf RED)

R1#sh run | sec router ospf 300

router ospf 300 vrf RED

 router-id 192.1.14.1

 domain-id 0.0.0.60

 log-adjacency-changes

 redistribute bgp 10 subnets

 network 192.1.14.1 0.0.0.0 area 0

R1#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

R1(config)#router ospf 300 vrf RED

R1(config-router)#domain-id 0.0.0.120

R1(config-router)#end

R1#clear ip ospf process

Reset ALL OSPF processes? [no]: yes

R4#sh ip route ospf | inc 6.6.6.6

O E2    6.6.6.6 [110/11] via 192.1.14.1, 00:00:00, FastEthernet0/0

R4#sh ip route 6.6.6.6           

Routing entry for 6.6.6.6/32

  Known via "ospf 300", distance 110, metric 11

  Tag Complete, Path Length == 1, AS 10, , type extern 2, forward metric 1

  Last update from 192.1.14.1 on FastEthernet0/0, 00:00:09 ago

  Routing Descriptor Blocks:

  * 192.1.14.1, from 192.1.14.1, 00:00:09 ago, via FastEthernet0/0

      Route metric is 11, traffic share count is 1

      Route tag 3489660938

Now, let us get the domain IDs the same and change the process ID

R1(config)#no router ospf 300 vrf RED

R1(config)#

router ospf 301 vrf RED

R1(config-router)# router-id 192.1.14.1

R1(config-router)# domain-id 0.0.0.60

R1(config-router)# log-adjacency-changes

R1(config-router)# redistribute bgp 10 subnets

R1(config-router)# network 192.1.14.1 0.0.0.0 area 0

R4#sh ip route ospf | inc 6.6.6.6

O IA    6.6.6.6 [110/12] via 192.1.14.1, 00:00:01, FastEthernet0/0

R4#sh ip route 6.6.6.6

Routing entry for 6.6.6.6/32

  Known via "ospf 300", distance 110, metric 12, type inter area

  Last update from 192.1.14.1 on FastEthernet0/0, 00:00:12 ago

  Routing Descriptor Blocks:

  * 192.1.14.1, from 192.1.14.1, 00:00:12 ago, via FastEthernet0/0

      Route metric is 12, traffic share count is 1

So changing the process IDs and the domain IDs value the same will not affect the route to be IA or E (1|2), let us now remove the domain IDs configuration

R1#sh run | sec router ospf 301

router ospf 301 vrf RED

 router-id 192.1.14.1

 domain-id 0.0.0.60

 log-adjacency-changes

 redistribute bgp 10 subnets

 network 192.1.14.1 0.0.0.0 area 0

R1#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

R1(config)#router ospf 301 vrf RED

R1(config-router)#no  domain-id 0.0.0.60

R1(config-router)#end

R3(config)#router ospf 150 vrf BLUE

R3(config-router)#router ospf 300 vrf RED

R3(config-router)#no domain-id 0.0.0.60  

R4#sh ip route ospf | inc 6.6.6.6

O E2    6.6.6.6 [110/11] via 192.1.14.1, 00:00:00, FastEthernet0/0

R4#sh ip route 6.6.6.6          

Routing entry for 6.6.6.6/32

  Known via "ospf 300", distance 110, metric 11

  Tag Complete, Path Length == 1, AS 10, , type extern 2, forward metric 1

  Last update from 192.1.14.1 on FastEthernet0/0, 00:00:03 ago

  Routing Descriptor Blocks:

  * 192.1.14.1, from 192.1.14.1, 00:00:03 ago, via FastEthernet0/0

      Route metric is 11, traffic share count is 1

      Route tag 3489660938

.net file

For anyone want to lab it up, please find the .net file below

autostart = False

[127.0.0.1:7200]

    workingdir = /tmp

    udp = 10001

    [[3725]]

        image = INE/c3725-adventerprisek9-mz.124-18.bin

        ram = 128

        ghostios = True

    [[ROUTER R4]]

        model = 3725

        console = 2004

        f0/0 = R1 f0/1

        x = -283.0

        y = 102.0

    [[ROUTER R5]]

        model = 3725

        console = 2005

        f0/0 = R1 f0/0

        f0/1 = R2 f0/0

        x = -38.0

        y = -165.0

    [[ROUTER R6]]

        model = 3725

        console = 2006

        f0/0 = R3 f0/0

        x = 58.0

        y = 99.0

    [[ROUTER R7]]

        model = 3725

        console = 2007

        f0/0 = R1 f1/0

        x = -150.0

        y = 103.0

    [[ROUTER R1]]

        model = 3725

        console = 2001

        f0/0 = R5 f0/0

        f0/1 = R4 f0/0

        slot1 = NM-1FE-TX

        f1/0 = R7 f0/0

        x = -223.0

        y = -16.0

    [[ROUTER R2]]

        model = 3725

        console = 2002

        wic0/0 = WIC-2T

        s0/0 = FR1 2

        f0/0 = R5 f0/1

        x = 87.0

        y = -87.0

    [[ROUTER R3]]

        model = 3725

        console = 2003

        wic0/0 = WIC-2T

        s0/0 = FR1 3

        f0/0 = R6 f0/0

        f0/1 = R8 f0/0

        x = 175.0

        y = -17.0

    [[ROUTER R8]]

        model = 3725

        console = 2008

        f0/0 = R3 f0/1

        x = 199.0

        y = 97.0

    [[FRSW FR1]]

        2:203 = 3:302

        3:302 = 2:203

        2 = R2 s0/0

        3 = R3 s0/0

        x = 193.5

        y = -109.5