Juniper OSPFv2

published: 5th of February 2019

Overview

3 steps to configure OSPFv2.

  • Create a router-id (optional)
  • Assign OSPF neighbor facing interfaces to OSPF area
  • Inject routes into OSPF via passive interfaces

Configuration

Create a router-id.

cmd 
set routing-options router-id 10.255.1.1

Assign OSPF neighbor facing interfaces to OSPF area.

cmd 
set protocols ospf area 0.0.0.0 interface ge-0/0/2.0

Inject routes into OSPF via passive interfaces.

cmd 
set protocols ospf area 0.0.0.13 interface ge-0/0/3.0 passive
set protocols ospf area 0.0.0.14 interface ge-0/0/4.0 passive

Topology

network/topologies/2-router.svg

P1R1

cmd 
set routing-options router-id 10.255.1.1
set protocols ospf area 0.0.0.0 interface ge-0/0/2.0
set protocols ospf area 0.0.0.13 interface ge-0/0/3.0 passive
set protocols ospf area 0.0.0.14 interface ge-0/0/4.0 passive

P1R2

cmd 
set routing-options router-id 10.255.1.2
set protocols ospf area 0.0.0.0 interface ge-0/0/1.0
set protocols ospf area 0.0.0.23 interface ge-0/0/3.0 passive
set protocols ospf area 0.0.0.24 interface ge-0/0/4.0 passive

Verification

Show OSPF interfaces.

cmd 
show ospf interface

# output

Interface           State   Area            DR ID           BDR ID          Nbrs
ge-0/0/2.0          BDR     0.0.0.0         10.255.1.2      10.255.1.1         1
ge-0/0/3.0          DRother 0.0.0.13        0.0.0.0         0.0.0.0            0
ge-0/0/4.0          DRother 0.0.0.14        0.0.0.0         0.0.0.0            0

Show OSPF neighbors.

cmd 
show ospf neighbor

# output

Address          Interface              State     ID               Pri  Dead
10.1.12.2        ge-0/0/2.0             Full      10.255.1.2       128    37

Show OSPF routing table.

cmd 
show route protocol ospf

# output

inet.0: 52 destinations, 52 routes (52 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.1.23.0/24       *[OSPF/10] 00:03:15, metric 2
                    > to 10.1.12.2 via ge-0/0/2.0
10.1.24.0/24       *[OSPF/10] 00:03:15, metric 2
                    > to 10.1.12.2 via ge-0/0/2.0
224.0.0.5/32       *[OSPF/10] 00:03:25, metric 1
                      MultiRecv

inet6.0: 86 destinations, 86 routes (86 active, 0 holddown, 0 hidden)

Show OSPF topology table.

cmd 
show ospf route

# output

Topology default Route Table:

Prefix             Path  Route      NH       Metric NextHop       Nexthop
                   Type  Type       Type            Interface     Address/LSP
10.255.1.2         Intra Area BR    IP            1 ge-0/0/2.0    10.1.12.2
10.1.12.0/24       Intra Network    IP            1 ge-0/0/2.0
10.1.13.0/24       Intra Network    IP            1 ge-0/0/3.0
10.1.14.0/24       Intra Network    IP            1 ge-0/0/4.0
10.1.23.0/24       Inter Network    IP            2 ge-0/0/2.0    10.1.12.2
10.1.24.0/24       Inter Network    IP            2 ge-0/0/2.0    10.1.12.2

show OSPF link state database.

cmd 
show ospf database

# output

    OSPF database, Area 0.0.0.0
 Type       ID               Adv Rtr           Seq      Age  Opt  Cksum  Len
Router  *10.255.1.1       10.255.1.1       0x80000002   267  0x22 0xe106  36
Router   10.255.1.2       10.255.1.2       0x80000003   271  0x22 0xdd06  36
Network  10.1.12.2        10.255.1.2       0x80000001   272  0x22 0xf703  32
Summary *10.1.13.0        10.255.1.1       0x80000002   267  0x22 0xc0b   28
Summary *10.1.14.0        10.255.1.1       0x80000002   267  0x22 0x115   28
Summary  10.1.23.0        10.255.1.2       0x80000002   311  0x22 0x9774  28
Summary  10.1.24.0        10.255.1.2       0x80000002   311  0x22 0x8c7e  28

    OSPF database, Area 0.0.0.13
 Type       ID               Adv Rtr           Seq      Age  Opt  Cksum  Len
Router  *10.255.1.1       10.255.1.1       0x80000001   272  0x22 0xc23e  36
Summary *10.1.12.0        10.255.1.1       0x80000003   262  0x22 0x1502  28
Summary *10.1.14.0        10.255.1.1       0x80000002   267  0x22 0x115   28
Summary *10.1.23.0        10.255.1.1       0x80000001   262  0x22 0xa963  28
Summary *10.1.24.0        10.255.1.1       0x80000001   262  0x22 0x9e6d  28

    OSPF database, Area 0.0.0.14
 Type       ID               Adv Rtr           Seq      Age  Opt  Cksum  Len
Router  *10.255.1.1       10.255.1.1       0x80000001   272  0x22 0xcb34  36
Summary *10.1.12.0        10.255.1.1       0x80000003   262  0x22 0x1502  28
Summary *10.1.13.0        10.255.1.1       0x80000002   267  0x22 0xc0b   28
Summary *10.1.23.0        10.255.1.1       0x80000001   262  0x22 0xa963  28
Summary *10.1.24.0        10.255.1.1       0x80000001   262  0x22 0x9e6d  28

Show OSPF message exchange.

cmd 
show ospf statistics

# output

Packet type             Total                  Last 5 seconds
                   Sent      Received        Sent      Received
   Hello             43            40           0             0
     DbD              3             2           0             0
   LSReq              1             1           0             0
LSUpdate              2             2           0             0
   LSAck              2             2           0             0

DBDs retransmitted     :                    0, last 5 seconds :          0
LSAs flooded           :                    3, last 5 seconds :          0
LSAs flooded high-prio :                    0, last 5 seconds :          0
LSAs retransmitted     :                    0, last 5 seconds :          0
LSAs transmitted to nbr:                    1, last 5 seconds :          0
LSAs requested         :                    3, last 5 seconds :          0
LSAs acknowledged      :                    5, last 5 seconds :          0

Flood queue depth      :               0
Total rexmit entries   :               0
db summaries           :               0
lsreq entries          :               0

Receive errors:
  None

https://www.juniper.net/documentation/en_US/junos/topics/example/ospf-single-area-configuring.html

http://notthenetwork.me/blog/2013/08/02/junos-basics-single-area-ospf/