OSPF SHAM LINK. Then VPN traffic is transmitted through the route over the backbone network but not backdoor routes. The sham link is a logical link, similar to a virtual link. A CE router can then learn the routes to other sites in the VPN by peering with its attached PE router. Router2(config-if)# # rip 1 version 2 network 192.168.1. network 12.0.0.0 AR2 ip vpn-instance a Configure < Return to Cisco.com search results. For basic information about how to configure an MPLS VPN, refer to the "MPLS Virtual Private Networks Configuration" module. If you modify the metric value, routing loops may occur. A CE router can then learn the routes to other sites in the VPN by peering with its attached PE router. When the backbone network is running properly, VPN traffic of CE1 and CE2 should be forwarded over the MPLS backbone network without passing through the OSPF intra-area routes. Other thing to remember is that those loopbacks must be advertised by a protocol other than OPSF. In an MPLS VPN configuration, the OSPF cost configured with a sham-link allows you to decide if OSPF client site traffic will be routed over a backdoor link or through the VPN backbone. When the sham link is active, hello packets are . support. It is defined in RFC 1163. If no backdoor link exists between sites in the same area, you do not need to configure any OSPF sham link. What is MPLS Label distributing protocol (LDP) ? For these steps following commands are used respectively. Figure 1: OSPF Sham Link Use the remote-neighbor command to configure the OSPF sham link on both VRFs joined by the link. Customers Also Viewed These Support Documents. undo arp learning passive enable Passive ARP. Router1(config)# interface loopback interface-number, 5. Removes the IP address. If STP is enabled If a prefix is learned across the sham-link and the path via the sham-link is selected as the best, the PE router does not generate an MP-BGP update for the prefix. Complete basic BGP/MPLS IP VPN configuration on the backbone network: configure an IGP, enable MPLS and LDP, and establish an MP-IBGP peer relationship between the PEs. --customer edge router. CEF VPN process-id Although OSPF PE-CE connections assume that the only path between two client sites is across the MPLS VPN backbone, backdoor paths between VPN sites (shown in grey in the figure below) may exist. Table 1Feature Information for OSPF Sham-Link Support for MPLS VPN, IPv6 Routing: OSPFv3 Authentication Support with IPsec, OSPF Update Packet-Pacing Configurable Timers, Autoroute Announce and http://www.cisco.com/cisco/web/support/index.html. When a router ID has been found, the process stops. An Internet protocol used to exchange routing information within an autonomous system. areaarea-id % Only classful networks will be redistributed. No new or modified RFCs are supported by this feature. huawei netengine series router configuration guide ip routing ospf configuration ospf configuration about this chapter building ospf networks, you can enable . A sham-link is required between any two VPN sites that belong to the same OSPF area and share an OSPF backdoor link. Copyright 2022 Huawei Technologies Co., Ltd. All rights reserved. CE 1 and CE 2 are in the same OSPF area. A Sham links is required only between two VPN sites that belong to the same area and have a backdoor link for backup purposes. the backbone network. forwarding *> 192.168.40.1/32 10.1.1.2 2 32768 ? *>i 10.0.0.0 192.168.10.1 0 100 0 ? These routes are then propagated across other PEs using MP-BGP. OSPF Update Packet-Pacing Configurable Timers, OSPF Forwarding Address Suppression in Translated Type-5 LSAs, OSPF Inbound Filtering Using Route Maps with a Distribute List, OSPFv3 Fast Convergence: LSA and SPF Throttling, OSPF Mechanism to Exclude Connected IP Prefixes from LSA Advertisements, OSPF Limit on Number of Redistributed Routes, OSPF Support for Unlimited Software VRFs per PE Router, OSPF Link-State Database Overload Protection, OSPF MIB Support of RFC 1850 and Latest Extensions, OSPF Support for Forwarding Adjacencies over MPLS TE Tunnels, Configuring OSPF TTL Security Check and OSPF Graceful Shutdown, Area Command in Interface Mode for OSPFv2, OSPFv3 IPSec ESP Encryption and Authentication, IPv6 Routing: OSPFv3 Authentication Support with IPsec, Using a Sham-Link to Correct OSPF Backdoor Routing. may not support all the features documented in this module. OSPF Sham links is a logical inter-area link carried by the super backbone. Router (config)# router ospf process_ID Router (config-router)# network IP_network_# [wild card mask] Area Number area number. Why Cannot L2VPN Map Packets by 802.1p Priority? Configures Timer intervals configured, Hello 10, Dead 40, Wait 40, Index 2/2, retransmission queue length 0, number of retransmission 0, Last retransmission scan length is 0, maximum is 0, Last retransmission scan time is 0 msec, maximum is 0 msec, Sham Link OSPF_SL0 to address 111.5.5.5 is up. The PE router uses the information received from MP-BGP to set the ongoing label stack of incoming packets, and to decide to which egress PE router to label switch the packets. Because the sham-link is seen as an intra-area link between PE routers, an OSPF adjacency is created and database exchange (for the particular OSPF process) occurs across the link. If you modify the metric value, routing loops may occur. 10-30-2011 09:50 AM. S1720, S2700, S5700, and S6720 V200R011C10. The only entry within the BGP table is the MP-BGP update received from PE-3 (the egress PE router for the 10.3.1.7/32 prefix). Router2(config)# We configure the virtual-link between ABRs and we use the area virtual-link command. The Sham-link is an unnumbered point-to-point intra-area link and is advertised as . SPF IGP The documentation set for this product strives to use bias-free language. To obtain better user experience, upgrade the browser to the latest version. click on Add Template and search for vedge. PE-1 and enters interface configuration mode. PE router connected to the CE router collects all the routes in a VRF routing table based on the VRF applied to the incoming interface. --VPN routing and forwarding instance. In some cases where Providers deliverMPLSlinks to customer locations ,OSPFmay be used asCE-PErouting protocol. The reason the OSPF route is not redistributed to BGP on the PE is because the other end of the sham-link already redistributed the route to BGP and there is no need for duplication. Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature. An advanced Layer 3 IP switching technology. The OSPF intra-area path is preferred over the interarea path (over the MPLS VPN backbone) generated by the PE-1 router. Use these resources to familiarize yourself with the community: What is OSPF Sham Links? vrf Step 1: Configure one loopback each on PE1 & PE2 and make it member of VRF. The MPLS VPN superbackbone provides an additional level of routing hierarchy to interconnect the VPN sites running OSPF. To locate and download MIBs for selected platforms, Cisco IOS XE releases, and feature sets, use Cisco MIB Locator found at the following URL: Application of the Border Gateway Protocol in the Internet. You can see that However, as shown in bold in the next example, the VRF routing table shows that the selected path is learned via OSPF with a next hop of 10.2.1.38, which is the Vienna CE router. As shown in bold in this example, the loopback interface is learned via BGP from PE-2 and PE-3. Sham link must be configured on both sides. router 1. 1 Redistribute external type 1 routes 2 Redistribute external type 2 routes metric Metric for redistributed routes nssa-external Redistribute OSPF NSSA external routes route-map Route map reference
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