Basic OSPF configuration in Nokia SROS

in #tutorial • 2 years ago

Basic-OSPF-configuration-in-Nokia-SROS.jpg

Open Shortest Path First (OSPF) is a link-state routing protocol developed in the late 1980s specifically for IP routing. It was the first routing protocol widely deployed in IP networks that provided a convergence time of a few seconds, with no routing loops. Article Basic OSPF configuration in Nokia SROS will cover sections such as OSPF routing only within a single area, OSPF multi-area, OSPF Stub area, NSSA and Route Redistribution in OSPF protocol.

OSPF Topology

The following is the topology for practise lab Basic Open Shortest Path First (OSPF) configuration in Nokia SROS. Here are some things to keep in mind:

  • The system address is 10.10.10.R/32 with R as the router number
  • All router interfaces are named toRZ, where Z is the router number
  • The IP address for all interfaces is numbered 10.X.Y.R/27, where X is the lower router,Y is the higher router, and R is the local router.

OSPF Topology.png

Simulation execution environment:

  • EVE-NG version: 2.0
  • Nokia SROS TiMOS-B-15.0.R3
  • Initial configuration such as IP, Port, Interfaces… will not be described in this lab. You can buy full lab with initial configuration, final configuration and topology unl file in the comment below.

OSPF Backbone area

In this lab, we will configure a backbone OSPF area (area 0) between routers R1, R2, R3 and R4.

OSPF Backbone area.png

Configure an OSPF backbone area between routers R1, R2, R3 and R4. For best practise, you should use interface-type point-to-point between P2P link for skip the DR and BDR election steps to help OSPF converge faster.

  • Configure router R1 and R4:
configure router ospf
            area 0.0.0.0
                interface "system"
                    no shutdown
                exit
                interface "toR2"
                    interface-type point-to-point
                    no shutdown
                exit
                interface "toR3"
                    interface-type point-to-point
                    no shutdown
                exit
            exit
            no shutdown
  • Configure router R2 and R3:
configure router ospf
            area 0.0.0.0
                interface "system"
                    no shutdown
                exit
                interface "toR1"
                    interface-type point-to-point
                    no shutdown
                exit
                interface "toR4"
                    interface-type point-to-point
                    no shutdown
                exit
            exit
            no shutdown
  • Verification:
A:R1# show router ospf neighbor

===============================================================================
Rtr Base OSPFv2 Instance 0 Neighbors
===============================================================================
Interface-Name                   Rtr Id          State      Pri  RetxQ   TTL
   Area-Id
-------------------------------------------------------------------------------
toR2                             10.10.10.2      Full       1    0       37
   0.0.0.0
toR3                             10.10.10.3      Full       1    0       32
   0.0.0.0
-------------------------------------------------------------------------------
No. of Neighbors: 2
===============================================================================

A:R1# show router ospf interface

===============================================================================
Rtr Base OSPFv2 Instance 0 Interfaces
===============================================================================
If Name               Area Id         Designated Rtr  Bkup Desig Rtr  Adm  Oper
-------------------------------------------------------------------------------
system                0.0.0.0         10.10.10.1      0.0.0.0         Up   DR
toR2                  0.0.0.0         0.0.0.0         0.0.0.0         Up   PToP
toR3                  0.0.0.0         0.0.0.0         0.0.0.0         Up   PToP
-------------------------------------------------------------------------------
No. of OSPF Interfaces: 3
===============================================================================

A:R1# show router ospf database

===============================================================================
Rtr Base OSPFv2 Instance 0 Link State Database (type: All)
===============================================================================
Type    Area Id         Link State Id   Adv Rtr Id      Age  Sequence   Cksum
-------------------------------------------------------------------------------
Router  0.0.0.0         10.10.10.1      10.10.10.1      174  0x80000014 0xbb1e
Router  0.0.0.0         10.10.10.2      10.10.10.2      212  0x80000012 0x844e
Router  0.0.0.0         10.10.10.3      10.10.10.3      171  0x80000012 0x6d5c
Router  0.0.0.0         10.10.10.4      10.10.10.4      177  0x8000000e 0x3a8a
-------------------------------------------------------------------------------
No. of LSAs: 4
===============================================================================

A:R1# show router route-table protocol ospf

===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix[Flags]                            Type    Proto     Age        Pref
      Next Hop[Interface Name]                                    Metric
-------------------------------------------------------------------------------
10.2.4.0/27                                   Remote  OSPF      00h04m36s  10
       10.1.2.2                                                     200
10.3.4.0/27                                   Remote  OSPF      00h03m49s  10
       10.1.3.3                                                     200
10.10.10.2/32                                 Remote  OSPF      00h04m36s  10
       10.1.2.2                                                     100
10.10.10.3/32                                 Remote  OSPF      00h03m49s  10
       10.1.3.3                                                     100
10.10.10.4/32                                 Remote  OSPF      00h04m31s  10
       10.1.2.2                                                     200
-------------------------------------------------------------------------------
No. of Routes: 5
Flags: n = Number of times nexthop is repeated
       B = BGP backup route available
       L = LFA nexthop available
       S = Sticky ECMP requested
===============================================================================

Configure OSPF multi-area

In this task, we will start R5 to configure. In router R5, create Loopback0 with address 5.5.5.5/24 and export the loopback network via OSPF. Link between R1 and R5 use OSPF area 5. The goal of this task is R1 can reach the loopback0 of R5 via OSPF protocol.

Configure OSPF multi-area.png

Step 1: Configure OSPF Area 5 between routers R1 and R5

A:R1# configure router ospf area 5
*A:R1>config>router>ospf>area$ interface "toR5" no shutdown
*A:R1>config>router>ospf>area$ interface "toR5" interface-type point-to-point
*A:R1>config>router>ospf>area$ /admin save

A:R5# configure router ospf area 5
*A:R5>config>router>ospf>area$ interface "system" no shutdown
*A:R5>config>router>ospf>area$ interface "toR1" no shutdown
*A:R5>config>router>ospf>area$ interface "toR1" interface-type point-to-point
*A:R5>config>router>ospf>area$ back
*A:R5>config>router>ospf$ no shutdown
*A:R5>config>router>ospf$ /admin save

A:R5# show router ospf neighbor

===============================================================================
Rtr Base OSPFv2 Instance 0 Neighbors
===============================================================================
Interface-Name                   Rtr Id          State      Pri  RetxQ   TTL
   Area-Id
-------------------------------------------------------------------------------
toR1                             10.10.10.1      Full       1    0       35
   0.0.0.5
-------------------------------------------------------------------------------
No. of Neighbors: 1

Step 2: On router R5, configure a loopback address 5.5.5.5/24 and export the loopback network via OSPF.

configure router interface lo0
address 5.5.5.5/24
loopback

Configure a routing policy to export the loopback network via OSPF. Remember begin/commit when configure policy.

configure router
        policy-options
            begin
            prefix-list "LB0"
                prefix 5.5.5.0/24 exact
            exit
            policy-statement "Export_Loopback0_to_OSPF"
                entry 10
                    from
                        prefix-list "LB0"
                    exit
                    action accept
                    exit
                exit
            exit
            commit
        exit

Export policy to OSPF and configure as ASBR (Autonomous System Border Router)

configure router ospf
            asbr
            export "Export_Loopback0_to_OSPF"

Verification: Display the routing table and database on router R1

A:R1# show router route-table protocol ospf

===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix[Flags]                            Type    Proto     Age        Pref
      Next Hop[Interface Name]                                    Metric
-------------------------------------------------------------------------------
5.5.5.0/24                                    Remote  OSPF      00h06m34s  150
       10.1.5.5                                                     1
10.2.4.0/27                                   Remote  OSPF      00h59m44s  10
       10.1.2.2                                                     200
10.3.4.0/27                                   Remote  OSPF      00h58m57s  10
       10.1.3.3                                                     200
10.10.10.2/32                                 Remote  OSPF      00h59m44s  10
       10.1.2.2                                                     100
10.10.10.3/32                                 Remote  OSPF      00h58m57s  10
       10.1.3.3                                                     100
10.10.10.4/32                                 Remote  OSPF      00h59m39s  10
       10.1.2.2                                                     200
-------------------------------------------------------------------------------
No. of Routes: 6

A:R1# show router ospf database

===============================================================================
Rtr Base OSPFv2 Instance 0 Link State Database (type: All)
===============================================================================
Type    Area Id         Link State Id   Adv Rtr Id      Age  Sequence   Cksum
-------------------------------------------------------------------------------
Router  0.0.0.0         10.10.10.1      10.10.10.1      1918 0x80000017 0xb81d
Router  0.0.0.0         10.10.10.2      10.10.10.2      261  0x80000014 0x8050
Router  0.0.0.0         10.10.10.3      10.10.10.3      769  0x80000014 0x695e
Router  0.0.0.0         10.10.10.4      10.10.10.4      1946 0x8000000f 0x388b
Summary 0.0.0.0         10.1.5.0        10.10.10.1      1922 0x80000002 0xdd0a
AS Summ 0.0.0.0         10.10.10.5      10.10.10.1      477  0x80000001 0xb6fe
Router  0.0.0.5         10.10.10.1      10.10.10.1      1699 0x80000005 0x7f94
Router  0.0.0.5         10.10.10.5      10.10.10.5      479  0x80000006 0x50b9
Summary 0.0.0.5         10.1.2.0        10.10.10.1      1918 0x80000002 0xfeeb
Summary 0.0.0.5         10.1.3.0        10.10.10.1      1918 0x80000002 0xf3f5
Summary 0.0.0.5         10.2.4.0        10.10.10.1      406  0x80000003 0xc6bb
Summary 0.0.0.5         10.3.4.0        10.10.10.1      547  0x80000003 0xbac6
Summary 0.0.0.5         10.10.10.1      10.10.10.1      487  0x80000003 0xfc20
Summary 0.0.0.5         10.10.10.2      10.10.10.1      1918 0x80000002 0xe0d7
Summary 0.0.0.5         10.10.10.3      10.10.10.1      1918 0x80000002 0xd6e0
Summary 0.0.0.5         10.10.10.4      10.10.10.1      389  0x80000003 0xb69a
AS Ext  n/a             5.5.5.0         10.10.10.5      477  0x80000001 0x2976
-------------------------------------------------------------------------------
No. of LSAs: 17

Configure OSPF Stub area

Convert Area 4 to a stub area and display the differences in each of the routing tables and the OSPF databases.

Configure OSPF Stub area.png

Step 1: On both router R1 and R5, convert Area 5 to a stub area

configure router ospf area 5 stub

Use clear router ospf neighbor for fast convergence. Database in router R5 will appear Summary entry with 0.0.0.0 and default route in the routing table like bellow show command.

A:R5# show router ospf database

===============================================================================
Rtr Base OSPFv2 Instance 0 Link State Database (type: All)
===============================================================================
Type    Area Id         Link State Id   Adv Rtr Id      Age  Sequence   Cksum
-------------------------------------------------------------------------------
Router  0.0.0.5         10.10.10.1      10.10.10.1      159  0x8000000d 0x8d80
Router  0.0.0.5         10.10.10.5      10.10.10.5      158  0x80000009 0x62a8
Summary 0.0.0.5         0.0.0.0         10.10.10.1      156  0x80000008 0x8ea9
Summary 0.0.0.5         10.1.2.0        10.10.10.1      293  0x80000002 0x1dcf
Summary 0.0.0.5         10.1.3.0        10.10.10.1      293  0x80000002 0x12d9
Summary 0.0.0.5         10.2.4.0        10.10.10.1      293  0x80000002 0xe69e
Summary 0.0.0.5         10.3.4.0        10.10.10.1      293  0x80000002 0xdaa9
Summary 0.0.0.5         10.10.10.1      10.10.10.1      293  0x80000002 0x1d03
Summary 0.0.0.5         10.10.10.2      10.10.10.1      293  0x80000002 0xfebb
Summary 0.0.0.5         10.10.10.3      10.10.10.1      293  0x80000002 0xf4c4
Summary 0.0.0.5         10.10.10.4      10.10.10.1      293  0x80000002 0xd67d
AS Ext  n/a             5.5.5.0         10.10.10.5      273  0x80000001 0x2976
-------------------------------------------------------------------------------
No. of LSAs: 12
===============================================================================

A:R5# show router route-table protocol ospf

===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix[Flags]                            Type    Proto     Age        Pref
      Next Hop[Interface Name]                                    Metric
-------------------------------------------------------------------------------
0.0.0.0/0                                     Remote  OSPF      00h03m07s  10
       10.1.5.1                                                     101
10.1.2.0/27                                   Remote  OSPF      00h03m07s  10
       10.1.5.1                                                     200
10.1.3.0/27                                   Remote  OSPF      00h03m07s  10
       10.1.5.1                                                     200
10.2.4.0/27                                   Remote  OSPF      00h03m07s  10
       10.1.5.1                                                     300
10.3.4.0/27                                   Remote  OSPF      00h03m07s  10
       10.1.5.1                                                     300
10.10.10.1/32                                 Remote  OSPF      00h03m07s  10
       10.1.5.1                                                     100
10.10.10.2/32                                 Remote  OSPF      00h03m07s  10
       10.1.5.1                                                     200
10.10.10.3/32                                 Remote  OSPF      00h03m07s  10
       10.1.5.1                                                     200
10.10.10.4/32                                 Remote  OSPF      00h03m08s  10
       10.1.5.1                                                     300
-------------------------------------------------------------------------------
No. of Routes: 9

Step 2: To fully remove summary entry (except default-route) in the database, on router R1, configure the stub area with the “no-summaries” option.

configure router ospf area 5 stub no summaries

Let’s check database and routing table in the router R5.

A:R5# show router ospf  database

===============================================================================
Rtr Base OSPFv2 Instance 0 Link State Database (type: All)
===============================================================================
Type    Area Id         Link State Id   Adv Rtr Id      Age  Sequence   Cksum
-------------------------------------------------------------------------------
Router  0.0.0.5         10.10.10.1      10.10.10.1      400  0x8000000d 0x8d80
Router  0.0.0.5         10.10.10.5      10.10.10.5      399  0x80000009 0x62a8
Summary 0.0.0.5         0.0.0.0         10.10.10.1      57   0x80000009 0x8caa
AS Ext  n/a             5.5.5.0         10.10.10.5      513  0x80000001 0x2976
-------------------------------------------------------------------------------
No. of LSAs: 4

A:R5# show router route-table protocol ospf

===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix[Flags]                            Type    Proto     Age        Pref
      Next Hop[Interface Name]                                    Metric
-------------------------------------------------------------------------------
0.0.0.0/0                                     Remote  OSPF      00h01m07s  10
       10.1.5.1                                                     101
-------------------------------------------------------------------------------
No. of Routes: 1

When the “no-summaries” option is configured, the ABR router R1 stops advertising all summary addresses to router R5, with the exception of the default route. By the way, all router in Area 0 can’t reach the address 5.5.5.5/24 in router R5’s loopback0. Let’s try with NSSA.

*A:R1# show router route-table protocol ospf

===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix[Flags]                            Type    Proto     Age        Pref
      Next Hop[Interface Name]                                    Metric
-------------------------------------------------------------------------------
10.2.4.0/27                                   Remote  OSPF      02h13m08s  10
       10.1.2.2                                                     200
10.3.4.0/27                                   Remote  OSPF      01h30m04s  10
       10.1.3.3                                                     200
10.10.10.2/32                                 Remote  OSPF      02h13m08s  10
       10.1.2.2                                                     100
10.10.10.3/32                                 Remote  OSPF      01h30m04s  10
       10.1.3.3                                                     100
10.10.10.4/32                                 Remote  OSPF      01h18m48s  10
       10.1.2.2                                                     200
10.10.10.5/32                                 Remote  OSPF      00h00m12s  10
       10.1.5.5                                                     100
-------------------------------------------------------------------------------
No. of Routes: 6

Configure NSSA (Not-So-Stubby-Areas)

Convert Area 5 to an NSSA and display the differences in each of the routing tables and the OSPF databases. In this lab, you have to turn on all router from R1 to R6.

Configure NSSA (Not-So-Stubby-Areas).png

Step 1: On both routers R1 and R5, configure Area 5 as an NSSA.

configure router ospf area 5 nssa

A:R5# show router ospf database

===============================================================================
Rtr Base OSPFv2 Instance 0 Link State Database (type: All)
===============================================================================
Type    Area Id         Link State Id   Adv Rtr Id      Age  Sequence   Cksum
-------------------------------------------------------------------------------
Router  0.0.0.5         10.10.10.1      10.10.10.1      3    0x80000015 0xb340
Router  0.0.0.5         10.10.10.5      10.10.10.5      3    0x80000011 0x58a8
Summary 0.0.0.5         10.1.2.0        10.10.10.1      734  0x80000002 0x1dcf
Summary 0.0.0.5         10.1.3.0        10.10.10.1      734  0x80000002 0x12d9
Summary 0.0.0.5         10.2.4.0        10.10.10.1      734  0x80000002 0xe69e
Summary 0.0.0.5         10.3.4.0        10.10.10.1      734  0x80000002 0xdaa9
Summary 0.0.0.5         10.10.10.1      10.10.10.1      734  0x80000002 0x1d03
Summary 0.0.0.5         10.10.10.2      10.10.10.1      734  0x80000002 0xfebb
Summary 0.0.0.5         10.10.10.3      10.10.10.1      734  0x80000002 0xf4c4
Summary 0.0.0.5         10.10.10.4      10.10.10.1      734  0x80000002 0xd67d
NSSA    0.0.0.5         5.5.5.0         10.10.10.5      700  0x80000001 0xb4cd
-------------------------------------------------------------------------------

R1 can reach R5’s loopback with NSSA.

A:R1# show router route-table protocol ospf

===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix[Flags]                            Type    Proto     Age        Pref
      Next Hop[Interface Name]                                    Metric
-------------------------------------------------------------------------------
5.5.5.0/24                                    Remote  OSPF      00h15m44s  150
       10.1.5.5                                                     1
10.2.4.0/27                                   Remote  OSPF      02h11m49s  10
       10.1.2.2                                                     200
10.3.4.0/27                                   Remote  OSPF      01h28m45s  10
       10.1.3.3                                                     200
10.10.10.2/32                                 Remote  OSPF      02h11m49s  10
       10.1.2.2                                                     100
10.10.10.3/32                                 Remote  OSPF      01h28m45s  10
       10.1.3.3                                                     100
10.10.10.4/32                                 Remote  OSPF      01h17m30s  10
       10.1.2.2                                                     200
10.10.10.5/32                                 Remote  OSPF      00h05m03s  10
       10.1.5.5                                                     100
-------------------------------------------------------------------------------
No. of Routes: 7

Step 2: Configure router R1 no summary and advertise a default route into the NSSA area

By default, the ABR router R1 does not advertise a default route in an NSSA area. So if you want simplify database and R5 can reach outside, you have to both configure no summary and originate-default-route on the ABR (R1).

configure router ospf area 5
                nssa
                    originate-default-route
                    no summaries

A:R5# show router ospf database

===============================================================================
Rtr Base OSPFv2 Instance 0 Link State Database (type: All)
===============================================================================
Type    Area Id         Link State Id   Adv Rtr Id      Age  Sequence   Cksum
-------------------------------------------------------------------------------
Router  0.0.0.5         10.10.10.1      10.10.10.1      456  0x80000023 0x974e
Router  0.0.0.5         10.10.10.5      10.10.10.5      455  0x8000001f 0x3cb6
Summary 0.0.0.5         0.0.0.0         10.10.10.1      315  0x80000002 0x9aa3
NSSA    0.0.0.5         5.5.5.0         10.10.10.5      461  0x80000002 0xb2ce
-------------------------------------------------------------------------------
No. of LSAs: 4

Step 3: Configure Area 6 between routers R2 and R6.

In router R2:

configure router ospf area 6 interface "toR6" interface-type point-to-point

In router R6:

configure router ospf
            area 0.0.0.6
                interface "system"
                    no shutdown
                exit
                interface "toR2"
                    interface-type point-to-point
                    no shutdown
                exit
            exit
            no shutdown

Verification: Check database and ping to R5’s loopback.

A:R6# show router ospf database

===============================================================================
Rtr Base OSPFv2 Instance 0 Link State Database (type: All)
===============================================================================
Type    Area Id         Link State Id   Adv Rtr Id      Age  Sequence   Cksum
-------------------------------------------------------------------------------
Router  0.0.0.6         10.10.10.2      10.10.10.2      130  0x80000008 0xc345
Router  0.0.0.6         10.10.10.6      10.10.10.6      129  0x80000006 0xb817
Summary 0.0.0.6         10.1.2.0        10.10.10.2      417  0x80000002 0xf8f0
Summary 0.0.0.6         10.1.3.0        10.10.10.2      417  0x80000002 0xd9aa
Summary 0.0.0.6         10.1.5.0        10.10.10.2      417  0x80000002 0xc3be
Summary 0.0.0.6         10.2.4.0        10.10.10.2      417  0x80000002 0xd610
Summary 0.0.0.6         10.3.4.0        10.10.10.2      417  0x80000002 0xb6ca
Summary 0.0.0.6         10.10.10.1      10.10.10.2      417  0x80000002 0xe4d3
Summary 0.0.0.6         10.10.10.2      10.10.10.2      417  0x80000002 0xee2d
Summary 0.0.0.6         10.10.10.3      10.10.10.2      417  0x80000002 0xbc95
Summary 0.0.0.6         10.10.10.4      10.10.10.2      417  0x80000002 0xc6ee
Summary 0.0.0.6         10.10.10.5      10.10.10.2      417  0x80000002 0xa8a7
AS Summ 0.0.0.6         10.10.10.1      10.10.10.2      417  0x80000002 0xd6e0
AS Ext  n/a             5.5.5.0         10.10.10.1      1324 0x80000001 0xf08f
-------------------------------------------------------------------------------
No. of LSAs: 14

A:R6# ping 5.5.5.5
PING 5.5.5.5 56 data bytes
64 bytes from 5.5.5.5: icmp_seq=1 ttl=62 time=17.2ms.
64 bytes from 5.5.5.5: icmp_seq=2 ttl=62 time=6.03ms.
64 bytes from 5.5.5.5: icmp_seq=3 ttl=62 time=16.4ms.
64 bytes from 5.5.5.5: icmp_seq=4 ttl=62 time=16.4ms.
64 bytes from 5.5.5.5: icmp_seq=5 ttl=62 time=4.71ms.

---- 5.5.5.5 PING Statistics ----
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min = 4.71ms, avg = 12.1ms, max = 17.2ms, stddev = 5.55ms

Route Redistribution OSPF with ISIS

In this lab, we will configure the OSPF network to redistribute routes learned from an external domain (IS-IS) into the OSPF network. Start all router (R1 to R6) to practise.

Route Redistribution OSPF with ISIS.png

Step 1: Configure IS-IS area 49.100 in router R2 and R6.

In R2:

configure router ospf area 6 interface "toR6" shutdown
configure router isis
            area-id 49.0100
            interface "system"
                no shutdown
            exit
            interface "toR6"
                no shutdown
            exit
            no shutdown

In R6:

configure router ospf shutdown
configure router no ospf
configure router isis
            area-id 49.0100
            interface "system"
                no shutdown
            exit
            interface "toR2"
                no shutdown
            exit
            no shutdown

A:R2# show router isis adjacency

===============================================================================
Rtr Base ISIS Instance 0 Adjacency
===============================================================================
System ID                Usage State Hold Interface                     MT-ID
-------------------------------------------------------------------------------
R6                       L1    Up    7    toR6                          0
R6                       L2    Up    7    toR6                          0
-------------------------------------------------------------------------------
Adjacencies : 2

Step 2: On router R6, configure a loopback address 6.6.6.6/24 and advertise the loopback interface into IS-IS

configure router interface lo0 address 6.6.6.6/24
configure router interface lo0 loopback

configure router
        policy-options
            begin
            prefix-list "LB0"
                prefix 6.6.6.0/24
            exit
            policy-statement "Export_Loopback0_to_ISIS"
                entry 10
                    from
                        prefix-list "LB0"
                    exit
                    action accept
                    exit
                exit
            exit
            commit
        exit

configure router isis export "Export_Loopback0_to_ISIS"

Verification in router R2:

A:R2# show router route-table protocol isis

===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix[Flags]                            Type    Proto     Age        Pref
      Next Hop[Interface Name]                                    Metric
-------------------------------------------------------------------------------
6.6.6.0/24                                    Remote  ISIS      00h09m01s  15
       10.2.6.6                                                     10
10.10.10.6/32                                 Remote  ISIS      00h15m35s  15
       10.2.6.6                                                     10
-------------------------------------------------------------------------------
No. of Routes: 2

Step 3: Configure R2 as ASBR and Redistribute IS-IS network to OSPF.

To reach the IS-IS learned networks from any of the backbone-area routers, the edge IS-IS learned networks need to be distributed into OSPF network.

configure router ospf asbr

configure router
        policy-options
            begin
            policy-statement "Redistribute_ISIS_OSPF"
                entry 10
                    from
                        protocol isis
                    exit
                    to
                        protocol ospf
                    exit
                    action accept
                    exit
                exit
            exit
            commit
        exit

configure router ospf export "Redistribute_ISIS_OSPF"

Verification: On router R3, display the LSDB and routing table.

A:R3# show router ospf database

===============================================================================
Rtr Base OSPFv2 Instance 0 Link State Database (type: All)
===============================================================================
Type    Area Id         Link State Id   Adv Rtr Id      Age  Sequence   Cksum
-------------------------------------------------------------------------------
Router  0.0.0.0         10.10.10.1      10.10.10.1      34   0x80000017 0xbe15
Router  0.0.0.0         10.10.10.2      10.10.10.2      371  0x8000000f 0x9043
Router  0.0.0.0         10.10.10.3      10.10.10.3      1474 0x8000000a 0x7d54
Router  0.0.0.0         10.10.10.4      10.10.10.4      617  0x8000000b 0x4087
Summary 0.0.0.0         10.1.5.0        10.10.10.1      2091 0x8000000d 0xc715
Summary 0.0.0.0         10.10.10.5      10.10.10.1      1620 0x80000002 0xc2f2
AS Ext  n/a             5.5.5.0         10.10.10.1      1517 0x80000002 0xee90
AS Ext  n/a             6.6.6.0         10.10.10.2      88   0x80000001 0x7125
AS Ext  n/a             10.10.10.6      10.10.10.2      88   0x80000001 0xa4df
-------------------------------------------------------------------------------
No. of LSAs: 9

A:R3# show router route-table protocol ospf

===============================================================================
Route Table (Router: Base)
===============================================================================
Dest Prefix[Flags]                            Type    Proto     Age        Pref
      Next Hop[Interface Name]                                    Metric
-------------------------------------------------------------------------------
5.5.5.0/24                                    Remote  OSPF      01h03m48s  150
       10.1.3.1                                                     1
6.6.6.0/24                                    Remote  OSPF      00h03m34s  150
       10.1.3.1                                                     10
10.1.2.0/27                                   Remote  OSPF      02h35m24s  10
       10.1.3.1                                                     200
10.1.5.0/27                                   Remote  OSPF      01h04m02s  10
       10.1.3.1                                                     200
10.2.4.0/27                                   Remote  OSPF      02h24m15s  10
       10.3.4.4                                                     200
10.10.10.1/32                                 Remote  OSPF      02h35m24s  10
       10.1.3.1                                                     100
10.10.10.2/32                                 Remote  OSPF      02h35m24s  10
       10.1.3.1                                                     200
10.10.10.4/32                                 Remote  OSPF      02h24m15s  10
       10.3.4.4                                                     100
10.10.10.5/32                                 Remote  OSPF      01h03m52s  10
       10.1.3.1                                                     200
10.10.10.6/32                                 Remote  OSPF      00h03m34s  150
       10.1.3.1                                                     10
-------------------------------------------------------------------------------
No. of Routes: 10

In router R5, the LSDB does not contain the IS-IS routes because external routes learned from other areas are not advertised in an NSSA area

A:R5# show router ospf database

===============================================================================
Rtr Base OSPFv2 Instance 0 Link State Database (type: All)
===============================================================================
Type    Area Id         Link State Id   Adv Rtr Id      Age  Sequence   Cksum
-------------------------------------------------------------------------------
Router  0.0.0.5         10.10.10.1      10.10.10.1      889  0x8000002d 0x8358
Router  0.0.0.5         10.10.10.5      10.10.10.5      576  0x8000002e 0x2090
Summary 0.0.0.5         0.0.0.0         10.10.10.1      113  0x80000006 0x92a7
NSSA    0.0.0.5         5.5.5.0         10.10.10.5      278  0x80000003 0x5e14
-------------------------------------------------------------------------------

We have completed configuring Basic OSPF in Nokia SROS. If you need to discuss further, you can leave a comment below the article.

#guide #networking #nokia #nokia-sr #training #hivemind #education #ospf #link-state
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