> For the complete documentation index, see [llms.txt](https://jncia-workbook.gitbook.io/workbook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jncia-workbook.gitbook.io/workbook/junos-routing/3-ospf.md).
# 3) OSPF
### Pre-Work
Load the config called **ospf.cfg** using the **load\_config\_on\_nodes.py** script.
```
python3 load_config_on_nodes.py --lab_dir three-routers --config_filename ospf.cfg
```
### Lab
R2 and R3 already have OSPFv2 and OSPFv3 configured. Try not to use them for reference, and configure R1 as follows:
* Configure ge-0/0/0, ge-0/0/3, and Lo0 for OSPFv2 and OSPFv3
* ge-0/0/0 should be network type point-to-point
* ge-0/0/3 should be passive
* Set the router ID to 10.0.0.1 (for both OSPFv2 and OSPFv3)
* All interfaces should belong to area 0
R1 should form adjacencies with R2 over OSPFv2 and OSPFv3, and be able to ping the loopbacks of R2 and R3 sourced from ge-0/0/3 (`10.1.100.1` and `2001:db8:1:100::1`).
```
admin@R1> ping 2.2.2.2 source 10.1.100.1
PING 2.2.2.2 (2.2.2.2): 56 data bytes
64 bytes from 2.2.2.2: icmp_seq=0 ttl=64 time=1.724 ms
64 bytes from 2.2.2.2: icmp_seq=1 ttl=64 time=1.669 ms
admin@R1> ping 2001:db8::3 source 2001:db8:1:100::1
PING6(56=40+8+8 bytes) 2001:db8:1:100::1 --> 2001:db8::3
16 bytes from 2001:db8::3, icmp_seq=0 hlim=63 time=2.504 ms
16 bytes from 2001:db8::3, icmp_seq=1 hlim=63 time=2.639 ms
```
### Answer
Expand to reveal
```
set protocols ospf area 0 interface ge-0/0/0.0 interface-type p2p
set protocols ospf area 0 interface ge-0/0/3.0 passive
set protocols ospf area 0 interface lo0.0
set protocols ospf3 area 0 interface ge-0/0/0.0 interface-type p2p
set protocols ospf3 area 0 interface ge-0/0/3.0 passive
set protocols ospf3 area 0 interface lo0.0
set routing-options router-id 10.0.0.1
```
### Explanation
Expand to reveal
In Junos, OSPF and OSPFv3 are configured under `protocols ospf` and `protocols ospf3` respectively.
\
The router ID cannot be set under individual protocols in Junos. Instead, the router ID is set globally and takes effect for all protocols.
```
set routing-options router-id 10.0.0.1
```
\
We should see that R1 has an adjacency with R2 over OSPFv2 and OSPFv3:
```
admin@R1> show ospf neighbor
Address Interface State ID Pri Dead
10.1.2.2 ge-0/0/0.0 Full 10.0.0.2 128 32
admin@R1> show ospf3 neighbor
ID Interface State Pri Dead
10.0.0.2 ge-0/0/0.0 Full 128 37
Neighbor-address fe80::aac1:abff:fe87:d32b
```
\
We can view the OSPF routes in the RIB using `protocol ospf`:
```
admin@R1> show route protocol ospf
inet.0: 9 destinations, 9 routes (9 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
2.2.2.2/32 *[OSPF/10] 00:05:04, metric 1
> to 10.1.2.2 via ge-0/0/0.0
3.3.3.3/32 *[OSPF/10] 00:05:04, metric 2
> to 10.1.2.2 via ge-0/0/0.0
10.2.3.0/24 *[OSPF/10] 00:05:04, metric 2
> to 10.1.2.2 via ge-0/0/0.0
224.0.0.5/32 *[OSPF/10] 00:05:14, metric 1
MultiRecv
mgmt_junos.inet.0: 3 destinations, 3 routes (3 active, 0 holddown, 0 hidden)
inet6.0: 13 destinations, 13 routes (13 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
2001:db8::2/128 *[OSPF3/10] 00:05:09, metric 1
> to fe80::aac1:abff:fe87:d32b via ge-0/0/0.0
2001:db8::3/128 *[OSPF3/10] 00:05:09, metric 2
> to fe80::aac1:abff:fe87:d32b via ge-0/0/0.0
2001:db8:2:3::/64 *[OSPF3/10] 00:05:09, metric 2
> to fe80::aac1:abff:fe87:d32b via ge-0/0/0.0
ff02::5/128 *[OSPF3/10] 00:05:14, metric 1
MultiRecv
mgmt_junos.inet6.0: 4 destinations, 4 routes (4 active, 0 holddown, 0 hidden)
admin@R1>
```
\
Note that we can use either `protocol ospf` or `protocol ospf3` to view OSPFv3 routes in the `inet6.0` table.
```
admin@R1> show route table inet6.0 protocol ospf
inet6.0: 13 destinations, 13 routes (13 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
2001:db8::2/128 *[OSPF3/10] 00:05:52, metric 1
> to fe80::aac1:abff:fe87:d32b via ge-0/0/0.0
2001:db8::3/128 *[OSPF3/10] 00:05:52, metric 2
> to fe80::aac1:abff:fe87:d32b via ge-0/0/0.0
2001:db8:2:3::/64 *[OSPF3/10] 00:05:52, metric 2
> to fe80::aac1:abff:fe87:d32b via ge-0/0/0.0
ff02::5/128 *[OSPF3/10] 00:05:57, metric 1
MultiRecv
admin@R1> show route table inet6.0 protocol ospf3
inet6.0: 13 destinations, 13 routes (13 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
2001:db8::2/128 *[OSPF3/10] 00:05:54, metric 1
> to fe80::aac1:abff:fe87:d32b via ge-0/0/0.0
2001:db8::3/128 *[OSPF3/10] 00:05:54, metric 2
> to fe80::aac1:abff:fe87:d32b via ge-0/0/0.0
2001:db8:2:3::/64 *[OSPF3/10] 00:05:54, metric 2
> to fe80::aac1:abff:fe87:d32b via ge-0/0/0.0
ff02::5/128 *[OSPF3/10] 00:05:59, metric 1
MultiRecv
```
\
We can inspect the OSPF database as well:
```
admin@R1> show ospf database
OSPF database, Area 0.0.0.0
Type ID Adv Rtr Seq Age Opt Cksum Len
Router *10.0.0.1 10.0.0.1 0x80000002 37 0x22 0xe56a 72
Router 10.0.0.2 10.0.0.2 0x80000003 43 0x22 0xf685 84
Router 10.0.0.3 10.0.0.3 0x80000002 73 0x22 0xceef 60
```
\
As well as the OSPFv3 database:
```
admin@R1> show ospf3 database
OSPF3 database, Area 0.0.0.0
Type ID Adv Rtr Seq Age Cksum Len
Router *0.0.0.0 10.0.0.1 0x80000001 69 0xeaf9 40
Router 0.0.0.0 10.0.0.2 0x80000002 70 0x8e31 56
Router 0.0.0.0 10.0.0.3 0x80000001 92 0xf0f0 40
IntraArPfx *0.0.0.1 10.0.0.1 0x80000001 69 0x9875 76
IntraArPfx 0.0.0.1 10.0.0.2 0x80000002 92 0x4abc 76
IntraArPfx 0.0.0.1 10.0.0.3 0x80000002 93 0xb289 64
OSPF3 Link-Local database, interface ge-0/0/0.0 Area 0.0.0.0
Type ID Adv Rtr Seq Age Cksum Len
Link *0.0.0.2 10.0.0.1 0x80000001 69 0x3c51 56
Link 0.0.0.2 10.0.0.2 0x80000001 92 0x5bd8 56
OSPF3 Link-Local database, interface lo0.0 Area 0.0.0.0
Type ID Adv Rtr Seq Age Cksum Len
Link *0.0.0.1 10.0.0.1 0x80000001 69 0x7e86 44
```
\
We can get details of the LSAs:
```
admin@R1> show ospf database router advertising-router self detail
OSPF database, Area 0.0.0.0
Type ID Adv Rtr Seq Age Opt Cksum Len
Router *10.0.0.1 10.0.0.1 0x80000002 245 0x22 0xe56a 72
bits 0x0, link count 4
id 10.0.0.2, data 10.1.2.1, Type PointToPoint (1)
Topology count: 0, Default metric: 1
id 10.1.2.0, data 255.255.255.0, Type Stub (3)
Topology count: 0, Default metric: 1
id 10.1.100.0, data 255.255.255.0, Type Stub (3)
Topology count: 0, Default metric: 1
id 1.1.1.1, data 255.255.255.255, Type Stub (3)
Topology count: 0, Default metric: 0
Topology default (ID 0)
Type: PointToPoint, Node ID: 10.0.0.2
Metric: 1, Bidirectional
admin@R1> show ospf3 database router advertising-router self detail
OSPF3 database, Area 0.0.0.0
Type ID Adv Rtr Seq Age Cksum Len
Router *0.0.0.0 10.0.0.1 0x80000001 286 0xeaf9 40
bits 0x0, Options 0x33
Type PointToPoint (1), Metric 1
Loc-If-Id 2, Nbr-If-Id 2, Nbr-Rtr-Id 10.0.0.2
Type: PointToPoint, Node ID: 10.0.0.2, Metric: 1, Bidirectional
```
\
Using `show ospf interface` we should see that `ge-0/0/3.0` is passive:
```
admin@R1> show ospf interface detail
Interface State Area DR ID BDR ID Nbrs
ge-0/0/0.0 PtToPt 0.0.0.0 0.0.0.0 0.0.0.0 1
Type: P2P, Address: 10.1.2.1, Mask: 255.255.255.0, MTU: 1500, Cost: 1
Adj count: 1
Hello: 10, Dead: 40, ReXmit: 5, Not Stub
Auth type: None
Protection type: None
Topology default (ID 0) -> Cost: 1
ge-0/0/3.0 DRother 0.0.0.0 0.0.0.0 0.0.0.0 0
Type: LAN, Address: 10.1.100.1, Mask: 255.255.255.0, MTU: 1500, Cost: 1
Adj count: 0, Passive <--------------------------
Hello: 10, Dead: 40, ReXmit: 5, Not Stub
Auth type: None
Protection type: None
Topology default (ID 0) -> Passive, Cost: 1
lo0.0 DR 0.0.0.0 10.0.0.1 0.0.0.0 0
Type: LAN, Address: 1.1.1.1, Mask: 255.255.255.255, MTU: 65535, Cost: 0
DR addr: 1.1.1.1, Priority: 128
Adj count: 0
Hello: 10, Dead: 40, ReXmit: 5, Not Stub
Auth type: None
Protection type: None
Topology default (ID 0) -> Cost: 0
admin@R1>
admin@R1> show ospf3 interface detail
Interface State Area DR ID BDR ID Nbrs
ge-0/0/0.0 PtToPt 0.0.0.0 0.0.0.0 0.0.0.0 1
Address fe80::aac1:abff:fec5:e483, Prefix-length 64
OSPF3-Intf-index 2, Type P2P, MTU 1500, Cost 1
Adj count: 1, Router LSA ID: 0
Hello 10, Dead 40, ReXmit 5, Not Stub
Protection type: None
ge-0/0/3.0 DRother 0.0.0.0 0.0.0.0 0.0.0.0 0
Address fe80::aac1:abff:fef7:fb75, Prefix-length 64
OSPF3-Intf-index 3, Type LAN, MTU 1500, Cost 1
Adj count: 0, Router LSA ID: -, Passive <--------------------------
Hello 10, Dead 40, ReXmit 5, Not Stub
Protection type: None
lo0.0 DR 0.0.0.0 10.0.0.1 0.0.0.0 0
Address fe80::e00:f60f:fc53:a100, Prefix-length 128
OSPF3-Intf-index 1, Type LAN, MTU 65535, Cost 0, Priority 128
Adj count: 0, Router LSA ID: -
DR addr fe80::e00:f60f:fc53:a100
Hello 10, Dead 40, ReXmit 5, Not Stub
Protection type: None
```
### Further Reading