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MPLS OSPF Domain-ID

Posted by MSSK , 18 August 2012 · 1,738 views

MPLS OSPF Domain-ID The lab is qouted from Anderson Mota Alves

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




November 2019

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