Posted on July 17, 2019


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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Remember we have a VRF configured on this router so this command will show routes in the global routing table the MPLS Core and it will not show the R1 sh bgp vpnv4 unicast all summary. First bring 3 routers into your topology R1, R2, R3 position them as below. R3 sh ip bgp vpnv4 vrf RED. Configure each router with a router-id that reflects the router number.

cusco 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. If a router-id is not configured manually in the OSPF routing process the router will automatically configure a router-id determined from the highest IP address of a logical interface loopback interface or the highest IP address of an active interface. R2 sh mpls ldp neigh.

Would you mind send me the GNS3 config files for this lab please? This command is executed in privileged mode to view OSPF process parameters such s the local cisdo and OSPF area information related to that router.

What is difference between ABR and ASBR in OSPF network?

R6 int lo0 ip add 6. Want to learn more about Network Automation? BGP router identifier 1. R1 sh bgp vpnv4 unicast all summary BGP router identifier 1. I am Oussema from Tunisia and I have found this tutorial very useful for me. Helloi repeated the process for R6 but still i am not able to ping from r4 to r6 loopbacks.


How to configure OSPFv3 IPv6 Routing in Cisco Routers

The router id is used in several OSPF related commands such as the specifying a specific neighbor when kspf a neighbor relationship or when viewing neighbor parameters by using the show ip ospf neighbor rid. Here we can see that 4. When referring to a higher IP address, step back and look at the IP address as a whole number. 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.

Configure the device interfaces. Currently working for Softcat plc. Addresses bound to peer LDP Ident: R3 hostname R3 int lo0 ip add 3.

Configuring The OSPF Router-ID | Free CCNA Workbook

Label 20 Exp 0 ] 16 msec 40 msec 16 msec. R3 config – if ip vrf forwarding RED. As discussed in Labthere is a reason for this. You can read more about who Roger is here About Roger. R1 sh ip route vrf red. 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.

Now at this point we have R4 peering to R1 but in the global routing table of R1 which is not what we want. Excellent work…it was very useful and self explanatory…thanks. It will use the local site addressing of If a loopback interface is configured, the IP address of the loopback interface becomes the router identifier.

Hi Roger, Very nice and self explanatory tutorial. Here you can see Routing Table: Network Automation skills are becoming a must for network engineers of the future. R1 sh ip route. R1 hostname R1 int lo0 ip add 1. You have to use a routing protocol for the loopbacks. Therefore, both should act in the same way, or am I wrong? Label 20 Exp 0] 16 msec 40 msec 16 msec 4 The Router-ID uniquely identifies a router in cknfiguration autonomous fisco, no two routers in an OSPF autonomous rougeur can have the same router-id.


The router identifier is used by OSPF to identify the routing device from which a packet originated. Establish a console session with devices R1, R2, R3, R4, R5 and SW1 than load the initial configurations provided below by copying the config from the textbox and pasting it into the respected routers console.

Tracing the route to 3. Your email address will not be published.

Example: Configuring an OSPF Router Identifier

R1 sh ip bgp vpnv4 vrf RED. Type escape sequence to abort. I would be so grateful.

You could show the routing table here, but the fact that you can ping between the loopbacks is verification enough and it is safe to move on.

Thank You Michael, I am glad you enjoyed the tutorial, I will be putting up a video of the entire process soon and then routeir 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. 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.

Label 17 Exp 0] 84 msec 72 msec 44 msec 2 R1 sh ip route Codes: