This lesson explains how to use OSPF as the PE-CE routing protocol for MPLS L3 VPN. The configuration is very similar to PE-CE RIP or PE-CE EIGRP but OSPF has some extra options as a link-state routing protocol.

OSPF Over VPN Be easy on me, I'm new to ospf, finally figured out how to keep the tunnel up when activating ospf my question. i have 3 routers all connected to each other so that there are 2 paths to all subnets between the routers. By doing this, the VPN sub-interface provides a vague equivallence to having a tunnel interface, which allows dynamic routing protocols (with some tweaks) to run over the VPN. This article will show how to configure this VPN, and get OSPF running across it. Sep 22, 2015 · BGP & OSPF over IPSEC VPN September 22, 2015 Rakesh M JUNIPER SECURITY Leave a comment. Hi, Continuing from where we left off from the previous post, OSPF by default uses multicast, which won't work directly via IPSec. Your hello packets can't reach the other side and you won't form an adjacency. You can use a GRE tunnel over the VPN and establish OSPF over the tunnel interfaces.

OSPF with IPsec VPN for network redundancy. This is a sample configuration of using OSPF with IPsec VPN to set up network redundancy. Route selection is based on OSPF cost calculation. You can configure ECMP or primary/secondary routes by adjusting OSPF path cost. Because the GUI can only complete part of the configuration, we recommend using

A sham-link is required between any two VPN sites that belong to the same OSPF area and share an OSPF backdoor link. If there is no intra-area link between the CE routers, you do not need to configure an OSPF sham link. Feb 01, 2014 · I had the privilege of introducing Cisco and Juniper into a new relationship. They were happy, holding hands and exchange routes, but the relationship was taboo, so they wanted to keep it private. Solution? OSPF over GRE/IPSec. Here is the topology: This diagram is helpful when mapping out the configuration: Here are my notes on […] Routed IPsec (VTI)¶ Route-based IPsec is an alternative method of managing IPsec traffic. It uses if_ipsec(4) from FreeBSD 11.1+ for Virtual Tunnel Interfaces (VTI) and traffic is directed using the operating system routing table. OSPF Over VPN Be easy on me, I'm new to ospf, finally figured out how to keep the tunnel up when activating ospf my question. i have 3 routers all connected to each other so that there are 2 paths to all subnets between the routers.

Re: OSPF over IPSec VPN Tunnel 2018/04/16 08:58:07 ☄ Helpful by gilbertog 2018/04/16 15:39:41 0 Hi, Ken is right - 224.0.0.5 would be sufficient for a point-to-point connection.

4. This in turn breaks the OSPF peering, as the OSPF payload is carried in an ESP packet 5. Hence the OSPF goes to "Init" again after the tunnel goes down. All OSPF routes are removed from the routing table along with route (192.168.0.2/32 via st0.0) 6. The route (192.168.0.0/30 via ge-0/0/0) is prefered now and the tunnel comes up again. 7. The cleanest way to use a routing protocol over VPN is to use IPSec over GRE tunnels, you set up a simple point-to-point GRE tunnel with IPSec enabled and only allow GRE traffic in the IPSec tunnel. Then advertise OSPF inside GRE. This Cisco article has got a few good examples: Jan 24, 2017 · Therefore, an OSPF over DMVPN design requires single-area OSPF within the DMVPN cloud. Every time there is a network change within an OSPF area, all routers within that area must rerun the Shortest Path First algorithm to reconverge. This can be very CPU-intensive in large networks.