This of course leads to more complexity in the configuration and troubleshooting of OSPF networks. Administrators that are used to the. This document shows sample configurations for Open Shortest Path First (OSPF) authentication which allows the flexibility to authenticate. router-id-ospf. Command Default. If this command is not configured, OSPF chooses an IPv4 address as the router ID from one of its interfaces.

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Hence, it is strongly recommended that you explicitly configure the router identifier under the [edit routing-options] hierarchy level to avoid unpredictable behavior if the interface address on a loopback interface changes.

Packet sent with a source address of 1. R3 hostname R3 int lo0 ip add 3. Type escape sequence to abort. R4 sh ip route. We are now going to add two more routers to the topology. You can read more about who Roger is here About Roger. This command is executed in OSPF router configuration mode to statically configure a router id on a specific neighbor.

What is difference between ABR and ASBR in OSPF network? – Network Bulls

Thanks very much, you made this really simple and easy to understand. I am Oussema from Tunisia and I have found this tutorial very useful for me. I am glad you enjoyed the tutorial, I will be putting up a video of the entire process soon and then as promised the second video, but I have just changed jobs so it might be a few weeks. Ateet, I have updated the tutorial and it is now complete, please review the last steps again and let me know if you get any issues.


Confirm your configuration by entering the show routing-options router-id command. R6 ciwco ip route. Hi roger thanks this was great explanation.

Hi Roger, Very nice and self explanatory tutorial.

So to review we have now configured IP addresses on the MPLS core, enabled OSPF and full IP connectivity between all routers and finally enabled mpls on all the interfaces in the core and have established ldp neighbors between all routers. R2 sh mpls interface.

This increases functionality by allowing network paths to be segmented without using multiple devices. R1 config – if. Im interested in the troubleshooting, where can I find this?

Process 2, Nbr 4. The router identifier is used by OSPF to identify the routing device from which a packet originated. R3 config – if ip vrf forwarding RED. To quickly configure an OSPF router identifier, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the commands into the Csico at the [edit] hierarchy level, and then enter commit from configuration mode.

Shawn, There was a delay in writing this post but it confighration complete now.

Example: Configuring an OSPF Router Identifier

The router identifier behavior described here holds good even when configured under [edit routing-instances routing-instance-name routing-options] and [edit logical-systems logical-system-name routing-instances routing-instance-name routing-options] hierarchy levels.


BGP table version is 1main routing table version 1.

R1 router ospf routur mpls ldp autoconfig R2 router ospf 1 mpls ldp autoconfig R3 router ospf 1 mpls ldp autoconfig. R1 config – if ip vrf forwarding RED. These will be the customer sites connected to R1 and R3.

Want to learn more about Network Automation? For this tutorial we will be using the second option, so go int the ospf process and enter mpls ldp autoconfig — this will enable mpls label distribution protocol on every interface running ospf under that specific process. To verify the mpls interfaces the command is very simple — sh mpls interface This is done on R2 and you can see that both interfaces are running mpls and using LDP.

Virtual routing configurafion forwarding VRF is a technology included in IP Internet Protocol that allows multiple instances of a routing table to co-exist in a router and work together but not interfere with each other. Configure each router with a router-id that reflects the router number. Thank you BTW the tutorial was great, a lot roouteur take in, cisc I loved that you went from start to finish. Excellent work…it was very useful and self explanatory…thanks.