# Wiki source code of EdgeRouter - OSPF Routing

Last modified by Jean Franco on 2024/06/09 22:14
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author | version | line-number | content
--- | --- | --- | ---
|  | 1 | == How to Configure OSPF Routing ==
|  | 2 |
|  | 3 | [[//OSPF will be used to provide reachability between the 10.0.4.0/24 and the 10.0.0.0/22 networks over the Site-to-Site VPN.//>>image:topology.png]]
|  | 4 |
|  | 5 | In the example diagram above, all of the EdgeRouters are ABRs (Area Border Routers) and contain an active interface in OSPF area 0 and another area. There is a Site-to-Site VPN configured between ER-4 and ER-1, over which the OSPF adjacency is established and the routing information for the 10.0.4.0/24 and 10.0.0.0/22 networks is exchanged. There is more information about VPNs in the [[Route-Based Site-to-Site IPsec VPN>>url:https://help.ui.com/hc/en-us/articles/115011377588]] article.
|  | 6 |
|  | 7 | Follow the steps below to enable the OSPF process on the relevant interfaces of all routers:
|  | 8 |
|  | 9 | **CLI:** Access the Command Line Interface on ER-4.You can do this using the CLI button in the GUI or by using a program such as PuTTY.
|  | 10 |
|  | 11 | ~1. Enter configuration mode.
|  | 12 |
|  | 13 | {{{configure}}}
|  | 14 |
|  | 15 | 2. Define the OSPF network type for the **vti0** interface.
|  | 16 |
|  | 17 | Copy
|  | 18 |
|  | 19 | {{{set interfaces vti vti0 ip ospf network point-to-point}}}
|  | 20 |
|  | 21 | 3.[[image:https://help-center-assets.ubnt.com/optional.svg||height="17" width="66"]] Define a custom OSPF router ID.
|  | 22 |
|  | 23 | Copy
|  | 24 |
|  | 25 | {{{set protocols ospf parameters router-id 0.0.0.4}}}
|  | 26 |
|  | 27 | 4. Enable the OSPF routing process on the relevant interfaces and define the OSPF area number.
|  | 28 |
|  | 29 | Copy
|  | 30 |
|  | 31 | {{{set protocols ospf area 0 network 10.255.12.0/30
|  | 32 | set protocols ospf area 4 network 10.0.4.0/24}}}
|  | 33 |
|  | 34 | 5.[[image:https://help-center-assets.ubnt.com/optional.svg||height="17" width="66"]] Set all interfaces to **passive**, with the exception of interfaces that should form adjacencies with other OSPF routers.
|  | 35 |
|  | 36 | Copy
|  | 37 |
|  | 38 | {{{set protocols ospf passive-interface default
|  | 39 | set protocols ospf passive-interface-exclude vti0
|  | 40 | set protocols ospf passive-interface-exclude eth1}}}
|  | 41 |
|  | 42 | **NOTE:** Interfaces which are set to passive are unable to form OSPF neighborship adjacancies.
|  | 43 |
|  | 44 | 6. Commit the changes and save the configuration.
|  | 45 |
|  | 46 | {{{commit ; save}}}
|  | 47 |
|  | 48 | **CLI:** Access the Command Line Interface on ER-1.
|  | 49 |
|  | 50 | ~1. Enter configuration mode.
|  | 51 |
|  | 52 | {{{configure}}}
|  | 53 |
|  | 54 | 2. Define the OSPF network type for the **vti0** interface.
|  | 55 |
|  | 56 | Copy
|  | 57 |
|  | 58 | {{{set interfaces vti vti0 ip ospf network point-to-point}}}
|  | 59 |
|  | 60 | 3. Define the OSPF network type for the **eth1** interface and lower the priority to 1.
|  | 61 |
|  | 62 | Copy
|  | 63 |
|  | 64 | {{{set interfaces ethernet eth1 ip ospf priority 1
|  | 65 | set interfaces ethernet eth1 ip ospf network broadcast}}}
|  | 66 |
|  | 67 | **NOTE:** Lowering the OSPF priority **ensures** that ER-1 becomes the DR (Designated Router) on the 10.0.1.0/24 LAN segment.
|  | 68 |
|  | 69 | 4.[[image:https://help-center-assets.ubnt.com/optional.svg||height="17" width="66"]] Define a custom OSPF router ID.
|  | 70 |
|  | 71 | Copy
|  | 72 |
|  | 73 | {{{set protocols ospf parameters router-id 0.0.0.1}}}
|  | 74 |
|  | 75 | 5. Enable the OSPF routing process on the relevant interfaces and define the OSPF area number.
|  | 76 |
|  | 77 | Copy
|  | 78 |
|  | 79 | {{{set protocols ospf area 0 network 10.255.12.0/30
|  | 80 | set protocols ospf area 0 network 10.0.1.0/24}}}
|  | 81 |
|  | 82 | 6. [[image:https://help-center-assets.ubnt.com/optional.svg||height="17" width="66"]] Set all interfaces to **passive**, with the exception of interfaces that should form adjacencies with other OSPF routers.
|  | 83 |
|  | 84 | Copy
|  | 85 |
|  | 86 | {{{set protocols ospf passive-interface default
|  | 87 | set protocols ospf passive-interface-exclude vti0
|  | 88 | set protocols ospf passive-interface-exclude eth1}}}
|  | 89 |
|  | 90 | 5. Commit the changes and save the configuration.
|  | 91 |
|  | 92 | {{{commit ; save}}}
|  | 93 |
|  | 94 | **CLI:** Access the Command Line Interface on ER-2.
|  | 95 |
|  | 96 | ~1. Enter configuration mode.
|  | 97 |
|  | 98 | {{{configure}}}
|  | 99 |
|  | 100 | 2. Define the OSPF network type for the **eth0 **interface.
|  | 101 |
|  | 102 | Copy
|  | 103 |
|  | 104 | {{{set interfaces ethernet eth0 ip ospf network broadcast}}}
|  | 105 |
|  | 106 | 3.[[image:https://help-center-assets.ubnt.com/optional.svg||height="17" width="66"]] Define a custom OSPF router ID.
|  | 107 |
|  | 108 | Copy
|  | 109 |
|  | 110 | {{{set protocols ospf parameters router-id 0.0.0.2}}}
|  | 111 |
|  | 112 | 4. Enable the OSPF routing process on the relevant interfaces and define the OSPF area number.
|  | 113 |
|  | 114 | Copy
|  | 115 |
|  | 116 | {{{set protocols ospf area 0 network 10.0.1.0/24
|  | 117 | set protocols ospf area 2 network 10.0.2.0/24}}}
|  | 118 |
|  | 119 | 4. [[image:https://help-center-assets.ubnt.com/optional.svg||height="17" width="66"]] Set all interfaces to **passive**, with the exception of interfaces that should form adjacencies with other OSPF routers.
|  | 120 |
|  | 121 | Copy
|  | 122 |
|  | 123 | {{{set protocols ospf passive-interface default
|  | 124 | set protocols ospf passive-interface-exclude eth0}}}
|  | 125 |
|  | 126 | 5. Commit the changes and save the configuration.
|  | 127 |
|  | 128 | {{{commit ; save}}}
|  | 129 |
|  | 130 | **CLI:** Access the Command Line Interface on ER-3.
|  | 131 |
|  | 132 | ~1. Enter configuration mode.
|  | 133 |
|  | 134 | {{{configure}}}
|  | 135 |
|  | 136 | 2. Define the OSPF network type for the **eth0** interface.
|  | 137 |
|  | 138 | Copy
|  | 139 |
|  | 140 | {{{set interfaces ethernet eth0 ip ospf network broadcast}}}
|  | 141 |
|  | 142 | 3.[[image:https://help-center-assets.ubnt.com/optional.svg||height="17" width="66"]] Define a custom OSPF router ID.
|  | 143 |
|  | 144 | Copy
|  | 145 |
|  | 146 | {{{set protocols ospf parameters router-id 0.0.0.3}}}
|  | 147 |
|  | 148 | 4. Enable the OSPF routing process on the relevant interfaces and define the OSPF area number.
|  | 149 |
|  | 150 | Copy
|  | 151 |
|  | 152 | {{{set protocols ospf area 0 network 10.0.1.0/24
|  | 153 | set protocols ospf area 3 network 10.0.3.0/24}}}
|  | 154 |
|  | 155 | 4. [[image:https://help-center-assets.ubnt.com/optional.svg||height="17" width="66"]] Set all interfaces to **passive**, with the exception of interfaces that should form adjacencies with other OSPF routers.
|  | 156 |
|  | 157 | Copy
|  | 158 |
|  | 159 | {{{set protocols ospf passive-interface default
|  | 160 | set protocols ospf passive-interface-exclude eth0}}}
|  | 161 |
|  | 162 | 5. Commit the changes and save the configuration.
|  | 163 |
|  | 164 | {{{commit ; save}}}
|  | 165 |
|  | 166 | After finalizing the OSPF configuration, the OSPF neighbor table and interfaces on ER-1 looks like this:
|  | 167 |
|  | 168 | {{{show ip ospf neighbor
|  | 169 | Total number of full neighbors: 3
|  | 170 |
|  | 171 | OSPF process 0 VRF(default):
|  | 172 | Neighbor ID Pri State Dead Time Address Interface Instance ID
|  | 173 | 0.0.0.2 1 Full/Backup 00:00:38 10.0.1.2 eth1 0
|  | 174 | 0.0.0.3 1 Full/DROther 00:00:33 10.0.1.3 eth1 0
|  | 175 | 0.0.0.4 1 Full/ - 00:00:31 10.255.12.2 vti0 0
|  | 176 |
|  | 177 | show ip ospf interface
|  | 178 | vti0 is up, line protocol is up
|  | 179 | Internet Address 10.255.12.1/30, Area 0.0.0.0, MTU 1436
|  | 180 | Process ID 0, VRF (default), Router ID 0.0.0.1, Network Type POINTTOPOINT, Cost: 10
|  | 181 | Transmit Delay is 1 sec, State Point-To-Point, TE Metric 10
|  | 182 | Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
|  | 183 | Neighbor Count is 1, Adjacent neighbor count is 1
|  | 184 | <output shortened>
|  | 185 |
|  | 186 | eth1 is up, line protocol is up
|  | 187 | Internet Address 10.0.1.1/24, Area 0.0.0.0, MTU 1500
|  | 188 | Process ID 0, VRF (default), Router ID 0.0.0.1, Network Type BROADCAST, Cost: 10
|  | 189 | Transmit Delay is 1 sec, State DR, Priority 1, TE Metric 10
|  | 190 | Designated Router (ID) 0.0.0.1, Interface Address 10.0.1.1
|  | 191 | Backup Designated Router (ID) 0.0.0.2, Interface Address 10.0.1.2
|  | 192 | Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
|  | 193 | Neighbor Count is 2, Adjacent neighbor count is 2
|  | 194 | <output shortened>}}}
|  | 195 |
|  | 196 | The OSPF routing table on ER-3 look like this:
|  | 197 |
|  | 198 | {{{show ip route ospf
|  | 199 |
|  | 200 | IP Route Table for VRF "default"
|  | 201 | O IA *> 10.0.2.0/24 [110/11] via 10.0.1.2, eth0, 00:01:44
|  | 202 | O *> 10.255.12.0/30 [110/20] via 10.0.1.1, eth0, 00:01:44
|  | 203 | O IA *> 10.0.4.0/24 [110/21] via 10.0.1.1, eth0, 00:01:44}}}

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