This video demonstrates configuration a DMVPN Hub and Spoke in Phase 3 Configuration . --> The problem with this scenario is CE routers will prefer path via back door compared to MPLS VPN Connection because of OSPF best path selection algorithm ( Intra Area vs Inter . Reader's Digest version: MPLS networks aren't free. Presented to you by instructor Rene Molenaar, CCIE #41726. R4(config-if)#ip address 11.11.11.4 255.255.255.255 Enterprise Wireless Certification. When we enable these interfaces, R1 and R5 will become neighbors, and see each others routes to the Fa0/0 and Fa0/1 networks as Intra-Area routes. Here is the routing table as it stands. Otherwise the routes learnt via the mpls backbone will be seen as inter-area at best and traffic will be forwarded via the backdoor as routes learnt via the backdoor are seen as intra-area and therefore preferred A sham-link overcomes the OSPF default behavior for selecting an intra-area backdoor route between VPN sites instead of an interarea (PE-to-PE) route. So lets now take a look at the Sham link adjusted OSPF database. The sham link is established between two IP addresses that have to be in the VRF of the customer. A VRF consists of an IP routing table, a derived forwarding table, a set of interfaces that use the forwarding table, and a set of rules and routing protocols that determine what goes into the forwarding table. A sham-link overcomes the OSPF default behavior for selecting an intra-area backdoor route between VPN sites instead of an interarea (PE-to-PE) route. If no backdoor link exists between the sites, no sham-link is required. Configures the specified OSPF process with the VRF associated with the sham-link interface on PE-2 and enters interface configuration mode. To access Cisco Feature Navigator, you must have an account on Cisco.com. Router2(config)# interface loopback interface-number. %OSPF-5-ADJCHG: Process 1, Nbr 10.12.0.2 on OSPF_SL0 from LOADING to FULL, Loading Done. In a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) configuration, a virtual connection called a sham-link can be configured to interconnect between two VPN sites that want to be in the same OSPF area. Mpls Layer 3 VPN Pe-ce Ospf Sham Link - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Client Site Connection Across the MPLS VPN Backbone. Finding Feature Information Prerequisites for IPv6 Routing: OSPFv3 Restrictions for IPv6 Routing: OSPFv3 Information About IPv6 Routing: OSPFv3 How to Configure Load Balancing in OSPFv3 sham-link VPN sham-linkVPNVPNOSPFVPNOSPF VPN PEOSPF MPLS VPNOSPFVPN 32LoopbackLoopbackVPNBGP OSPFPE By configuring OSPF Domain-ID using as below we can change the route type from OSPF External to Inter-Area. As shown in bold in this example, the loopback interface is learned via BGP from PE-2 and PE-3. CEF optimizes network performance and scalability for networks with large and dynamic traffic patterns. The OSPF sham-link is used only to influence intra-area path selection. It confirms Phase 3 connectivity between 2 Spokes and Hub to Spoke Conf. O IA 10.12.0.0 [110/2] via 10.45.0.4, 00:01:49, FastEthernet0/1. R5(config-subif)#no shut. This articles discusses how to troubleshoot such issues. To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL: http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml. In the MPLS VPN environment, several VPN client sites can be connected in the same OSPF area. Security Certifications. To prevent the backbone network from being disconnected, a backdoor link is created between the site1 and site2, R5 and R7 . Valid values: numeric value or valid IP address. 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. Keywords: Routing, Switching, Wifi, Cisco, Meraki, Cisco ISE, Check Point, OSPF, BGP, MPLS, ITIL, Azure Networking, ExpressRoute, SD-WAN, Palo Alto, Peering. OSPFsham-linkintra-areaMPLS sham-link MPLS-PECEOSPFPECEVRFPEPECE CEbackdoor linkbackdoor linkMPLS CE1OSPFCE24.4.4.4/32CE14.4.4.4 These links are able to fool or trick routers in the OSPF domain that this is a better path thus preserving the LSAs as type 1 or type 3. In order for redistribution other routing protocols into OSPF on CE works properly, we have to setup Sham Link. OSPF running on a PE device can use the routing information to generate inter-area routes from the PE to CE devices. The source and destination IP addresses must belong to the VRF and be advertised by Border Gateway Protocol (BGP) to remote PE routers. Associate the sham-link with an existing OSPF area. O 172.16.0.0 [110/65] via 10.15.0.1, 00:03:19, Serial0/1.15 An advanced Layer 3 IP switching technology. Router#show ip ospf data router ip-address. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. This is due to no longer being an external route and becoming an intra-area route. Interesting post Anthony. This says to me that the sham-link CANNOT be lable switched throughout the core network. All other routers in the area see the sham-link and use it to calculate intra-area shortest path first (SPF) routes to the remote site. The cost of the sham link can be modified using a command similar to the following: PE1(config-router)#area 0 . A sham-link is required between any two VPN sites that belong to the same OSPF area and share an OSPF backdoor link. And just to be sure, a ping to verify connectivity. The following example shows sample output from the show ip ospf sham-links command for a PE router in the VPN backbone: BGPBorder Gateway Protocol. Experience with Arista, Cisco and L1 switches. Cisco Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a specific set of features and which features are supported in a specific CiscoIOS image. . More fun times regarding MPLS, OSPF and MPBGP can be found in our workbooks for RS and SP. What they are, how they. OSPF sham-link host interfaces MUST be advertised by BGP and not the ospf process. Emerging industry standard upon which tag switching is based. Now our transit traffic is moving through the MPLS network, and the serial 0/1.15 interfaces are available as a backup. You need to setup a sham-link if you want the traffic between the two sites to prefer the mpls backbone rather than the backdoor link. Flexible Routing in an MPLS VPN Configuration Get Full Access to our 751 Cisco Lessons Now, OSPF Point-to-Multipoint Non-Broadcast Network Type, How to configure OSPF NSSA (Not So Stubby) Area, How to configure OSPF Totally NSSA (Not So Stubby) Area, OSPF Loop-Free Alternate (LFA) Fast Reroute (FRR), OSPF Remote Loop-Free Alternate (LFA) Fast Reroute (FRR). No new or modified MIBs are supported by this feature. There is no default. 10.0.0.0/24 is subnetted, 2 subnets R4(config-router)#address-family ipv4 vrf Vrf1 By advertising a type 1 LSA (Router) across this link, the OSPF database sees this route and the routes advertised across this link as acceptable. mk, Your email address will not be published. The Sham-link Endpoint Address must be advertised by BGP as VPN-IPv4 address; it must NOT be advertised by OSPF. Now the Service Providers MPLS network will only be used as a backup in the event the serial connection fails. 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 Figure2) may exist. Lets do one more test to prove that as well. CE1 and CE2 each have a loopback interface that is advertised in OSPF area 0. The sham link is an unnumbered point-to-point link inside a routing-instance between two PE routers. This command has no arguments or keywords. OSPF Sham Links are required when you try to use a backdoor link between two CE routers in an MPLS VPN PE CE scenario where you use OSPF as the PE-CE routing protocol. Type escape sequence to abort. Router2(config-if)# area area-id sham-link source-address destination-address cost number. The PE router can then flood LSAs between sites from across the MPLS VPN backbone. To remove the sham-link, use the no form of this command. It is defined in RFC 1163. close menu Language. All routing neighbors are available when verified from the device via CLI or GUI. These links are able to fool/trick routers in the OSPF domain that this is a better path thus preserving the LSAs as type 1 or type 3. Ps. We will use those loopbacks as the source/destination of the OSPF sham-link. For the most current information, go to the Cisco Feature Navigator home page at the following URL: No new or modified standards are supported by this feature. What is Sham Link? MPLS Layer 3 VPN PE-CE OSPF Sham Link _ NetworkLessons.com - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Removes the IP address. To achieve this, we will create a new loopback interface on each PE router which is advertised in BGP: Hi Rene, View MPLS Layer 3 VPN PE-CE OSPF Sham Link _ NetworkLessons.com.pdf from COMPUTER 198 at Polytechnic University of the Philippines. Mpls Layer 3 VPN Pe-ce Ospf Sham Link. OSPF Sham Links are required when we try to use a backdoor link between two CE routers in MPLS VPN PE CE scenarios. Great Courses, Lessons and Learning Material. Here you will find the startup configuration of each device. 1. Tracing the route to 172.16.0.1, 1 10.45.0.4 48 msec 92 msec 12 msec 2 10.34.0.3 [MPLS: Labels 16/24 Exp 0] 136 msec 180 msec 228 msec 3 10.12.0.2 [MPLS: Label 24 Exp 0] 124 msec 80 msec 88 msec 4 10.12.0.1 112 msec * 176 msec. OSPF creates an adjacency and exchanges LSAs across the sham link. Heres a quick example: 5 more replies! It creates a link that makes the MPLS PEs participating in the sham link appear as a point to point link within OSPF. A sham-link ensures that OSPF. All VPN processing occurs in the PE router. R4(config-if)#router bgp 24 Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature. The sham-link is configured on top of the MPLS VPN tunnel that connects two provider edge (PE) routers. We are actually going to pull a fast one, or a sham, on OSPF because the MPLS network is really acting as a superbackbone for OSPF, and therefore routes between the CEs are indeed Inter-Area by default. Under the release section, you can compare releases side by side to display both the features unique to each software release and the features in common. Source: CCIE study: OSPF Sham . In general, a VRF includes the routing information that defines a customer VPN site that is attached to a PE router. Your email address will not be published. Figure3 Using a Sham-Link Between PE Routers to Connect OSPF Client Sites. OSPF Network Design Solutions (2nd Edition)One of my reader asked a question,"Normally customers require sham link to prefer back door link in case of MPLS VPN environment, when customer run same area. A secure IP-based network that shares resources on one or more physical networks. Routes that are advertised across a MPLS/VPN that are imported and exported into BGP pass the route information with it. By using the commandarea sham-link cost it is possible to build this link. As a result, the desired Intra-Area routes are created. We can overcome this behaviour with the use of OSPF Sham Links. Note that customer routers receive information from Ethernet0/0 the upward link to the ISP for the Customer device. You only need a sham link when you have a backdoor link in between your CE routers. OSPF will always prefer an intra area route over an inter area route, this is regardless of the metric that is associated with that route. The metric is used on the remote PE routers to select the correct route. The traffic takes the backdoor link and not the MPLS cloud. Configures the specified OSPF process with the VRF associated with the sham-link interface on PE-1 and enters interface configuration mode. We can confirm that the backdoor link is routing all traffic by checking the OSPF route table. I built out a simple MPLS cloud and had one customer joining two sites across it. 172.16.0.0/24 is subnetted, 1 subnets Across the sham link, the PE routers can build an OSPF adjacency directly with each other. Because I have tried redistribution other routing protocols into OSPF on CE without Sham Link and result is PE which connected directly with CE got the routes but other PEs didnt got it. OSPF adjacency is established across the sham link. The routing table indicates that we are learning the other sites routes via the MPLS cloud. The only way to fix this is to advertise the routes that are learned through the MPLS VPN network as intra-area routes. To train the network to use the MPLS network as the primary transit path, we need to make the remote Ethernet customer networks look like Intra-Area routes via the PE routers, with a better metric than the serial interfaces, so they can be used instead of the slower serial link. MPLS TE Fast Reroute (FRR) protects MPLS TE LSPs from link and node failures. A sham-link overcomes the OSPF default behavior for selecting an intra-area backdoor route between VPN sites instead of an interarea (PE-to-PE) route. If the backdoor links between sites are used only for backup purposes and do not participate in the VPN service, then the default route selection shown in the preceding example is not acceptable. This blog post walks through the problem and the solution, including the configuration steps to create and verify a sham-link. When OSPF is used as a protocol between PE and CE routers, the OSPF metric is preserved when routes are advertised over the VPN backbone. Router1(config)# router ospf process-id vrf vrf-name. The two PE routers can then flood LSAs between sites from across the MPLS VPN backbone. This is because OSPF always prefers intra-area routes over inter-area routes. Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. CE routers are not aware of associated VPNs. Cisco Modeling Labs - Personal. Post was not sent - check your email addresses! 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. The team is responsible for running customers' mission critical applications on hybrid environments. cost number configures the OSPF cost for sending an IP packet on the PE-2 sham-link interface. area area-id sham-link source-address destination-address cost number, no area area-id sham-link source-address destination-address cost number. Open Shortest Pathway First ( OSPF ) is an Open Standard Link State routing protocol. IP address of the source PE router in the format: ip-address [mask]. When an OSPF sham-link is set it builds a bridge between two VRF's. By advertising a type 1 LSA (Router) across this link, the OSPF database sees this route and the routes advertised across this link as acceptable. To begin, MPLS is set up in the network as shown with R2 and R4 acting as Provider Edge (PE) routers, and MPLS is enabled throughout R2-R3-R4. This is the topology currently. The PE router also uses the information received from MP-BGP to set the outgoing label stack of incoming packets, and to decide to which egress PE router to label switch the packets. The following example shows the forwarding that occurs between sites from the standpoint of how PE-1 views the 10.3.1.7/32 prefix, the loopback1 interface of the Winchester CE router in Figure4. OSPF sham-link cost. I still love it when a plan comes together. You dont have to configure anything on the CE routers. 2. It is amazing how much there is to learn. If there is a backdoor link between R4 and R5, traffic will be routed over that backdoor link rather than going through MPLS cloud. Enters global configuration mode on the second PE router. The sham link is advertised using Type 1 link-state advertisements (LSAs). R5#show ip route ospf This means upon redistribution out of BGP into OSPF, routes retain their external route marking. Search. The sham link is a logical link, similar to a virtual link. By using two loopbacks on the respective devices advertised into the BGP address family that corresponds with the customer VRF, OSPF can create a link that is more appealing. Top 13 Most Asked OSPF Interview Questions with Answers - Interview Preprations 1. This will allow traffic to pass through the MPLS cloud as the preferred link and upon failure the backdoor link can be used to maintain connectivity. OSPF knowledge is not required but being familiar with the basics of routing is recommended. Lets do some testing and verification of what is currently in place. It allows you to create a point-to-point connection between the two PE routers. If these sites are connected over a backdoor link in addition to the VPN backbone, all traffic passes over the backdoor link instead of over the VPN backbone. Pretty cool. By default, OSPF external routes dont get redistributed into BGP but you can change that. Because the sham-link is seen as an Intra-Area link between PE routers (R2 and R4), an OSPF adjacency is created and database exchange takes place across the sham-link. Router1(config)# interface loopback interface-number. We can do this with the OSPF sham link. Lets go to R1 and see! en Change Language. When the VPN backbone has a sham intra-area link, this sham link can be preferred over the backup link if the sham link has a lower OSPF metric than the backup link. September 13, 2017 MPLS 3 comments. To create a sham-link, use the following commands starting in EXEC mode: Enters global configuration mode on the first PE router. --> OSPF Sham link is used when there is a backdoor link between two customer sites and MPLS VPN Connectivity. !!!!! Thx. CE1 and CE2 each have a loopback interface that . VRFVPN routing and forwarding instance. R4(config-router)#router ospf 1 vrf Vrf1 When an OSPF sham-link is set it builds a bridge between two VRFs. Configure the source and destination addresses of the sham-link as a host route mask (255.255.255.255) on the PE routers that serve as the endpoints of the sham-link. The backdoor link becomes favoured and subsequently used. smart-discover Hello . Cisco IOS software is packaged in feature sets that support specific platforms. f OSPF Sham-Link Support for MPLS VPN Feature Overview Feature Overview Using OSPF in PE-CE Router Connections In an MPLS VPN configuration, the OSPF protocol is one way you can connect customer edge (CE) routers to service provider edge (PE) routers in the VPN backbone. Displays information about how the sham-link is advertised as an unnumbered point-to-point connection between two PE routers. All other commands used with this feature are documented in the Cisco IOS Release 12.2 command reference publications. Here's an example. What Is Ospf Routing Protocol? Configures the sham-link on the PE-1 interface within a specified OSPF area and with the loopback interfaces specified by the IP addresses as endpoints. All Webinars & Events. As a result, the desired Intra-Area routes are created. To correct this default OSPF behavior in an MPLS VPN, use the area sham-link cost command to configure a sham-link between two PEs to connect the sites through the MPLS VPN backbone. 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. This could be a backup link that you want to use in case the MPLS VPN provider has issues: Lets enable OSPF on this interface and advertise it in area 0: The total cost through the MPLS VPN network is 4. OSPF has a lower administrative distance (AD) than internal BGP (BGP running between routers in the same autonomous system). CE routercustomer edge router. We are looking for a Network Engineer with automation skills that is comfortable with taking ownership of network layers and infrastructure, someone that can design and provide expert driven solutions optimized for given constraints. This is best explained with an example, take a look at the following topology: Above we have an MPLS VPN topology where we use OSPF as the PE-CE routing protocol. OSPF Sham Links are required when you try to use a backdoor link between two CE routers in an MPLS VPN PE CE scenario where you use OSPF as the PE-CE routing protocol. Community Impact. When a sham-link is configured between PE routers, the PEs can populate the VRF routing table with the OSPF routes learned over the sham-link. If a customers is using OSPF to peer between the CE and PE routers, and also has an OSPF CE to CE neighborship, the CE's will prefer the Intra-Area CE to CE routes (sometimes called the "backdoor" route in this situation), instead of using the Inter-Area CE to PE learned routes that use the MPLS network as a transit path. Looks like it is in place, but is it creating the desired result, of having the CE routers R1 and R5 see the Ethernet remote networks as reachable through the PE routers R2 and R4? Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2, Cisco IOS Configuration Fundamentals Command Reference, Release 12.2, Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols, Release 12.2, http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fiprrp_r/1rfospf.htm, http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t5/vpn.htm, http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt2/1cfospf.htm, http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt2/1cfbgp.htm, RFC 1164, Application of the Border Gateway Protocol in the Internet, RFC 2283, Multiprotocol Extensions for BGP-4, RFC 2328, Open Shortest Path First, Version 2, Determining Platform Support Through Cisco Feature Navigator. For this reason, you should not modify the metric value when OSPF is redistributed to BGP, and when BGP is redistributed to OSPF. 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. CCDE Certification. Router1(config-if)# ip vrf forwarding vrf-name. R4(config-router-af)#exit This prefix is the loopback interface of the Winchester CE router. If the check is successful, account details with a new random password will be e-mailed to you. thanks! Figure2 Backdoor Paths Between OSPF Client Sites. ", describes how to configure a sham-link between two PE routers. Looks like the sham-link came up. configures the OSPF cost for sending an IP packet on the PE-2 sham-link interface. A sham-link ensures that OSPF client sites that share a backdoor link can communicate over the MPLS VPN backbone and participate in VPN services. Darwin Recruitment is acting as an Employment Agency in relation to this vacancy. What the different OSPF stub areas are and how they work. Success rate is 100 percent (5/5), round-trip min/avg/max = 120/130/148 ms. Thats cool, so we know we have connectivity, and based on the routing table output, we believe it is going through the SP MPLS network. Redistributed routes in OSPF on a CE router is no problem. Currently, R1 and R5 see the routes to each others local networks through the VPNv4 MPLS network, and the routes show up as Inter-Area OSPF routes with the PE routers as the next hop. It is also generated through redistribution into BGP on PE-1. OSPF sham links are IP unnumbered P2P links between two PE devices on an MPLS VPN backbone network. As a result, OSPF sees both the path over the backdoor link and the path over the backbone as intra-area paths. A VPN client has three sites, each with a backdoor link. A sham-link ensures that OSPF client sites that share a backdoor link can communicate over the MPLS VPN backbone and participate in VPN services. The PE routers are then able to flood LSAs across the MPLS VPN backbone. Is that correct? R4(config-router-af)#network 11.11.11.4 mask 255.255.255.255 Failover approach, where a spoke has an active tunnel with one hub at any given point in time. Working through OSPF and MPLS recently I came across an interesting concept. Lets take a closer look at the sham link with a show command made just for that purpose. Notes. Router1(config-if)# area area-id sham-link source-address destination-address cost number. Generally, BGP peers use BGP extended community attributes to carry routing information over the MPLS VPN backbone. Open navigation menu. The OSPF database shows that the other customer site are inter-area router. The Sham-link is an unnumbered point-to-point intra-area link and is advertised as Type-1 link in router-LSA. Required fields are marked *. In the following example, PE-2 shows how an MP-BGP update for the prefix is not generated. router ospf 1. vrf A. domain-id type 0005 value 000000010200. Before you can configure a sham-link in an MPLS VPN, you must first enable OSPF as follows: Specify the range of IP addresses to be associated with the routing process. An advanced Layer 3 IP switching technology. Open shortest path first is an Open Standard Link State routing protocol which works by using Dijkastra algorithm to initially construct the shortest paths and follows that by populating the routing table with resulting best paths. The following example shows how to configure a sham-link between two PE routers: This section documents new commands. Type escape sequence to abort. A sham-link ensures that OSPF client sites that share a backdoor link can communicate over the MPLS VPN backbone and participate in VPN services. For example, Figure2 shows three client sites, each with backdoor links. Introduction of MPLS 2. Lets add a backdoor link between CE1 and CE2. Scribd is the world's largest social reading and publishing site. If an administrator is to adjust the interface level OSPF cost this would not affect the route. Just a humble clarification: Routes traversing the mpls superbackbone wont be injected as external (E1/2) but as inter-area (O IA) routes. Creates a loopback interface to be used as the endpoint of the sham-link on PE-2 and enters interface configuration mode. What the different OSPF LSA types are used for. Examples of common IGPs include IGRP, OSPF, and RIP. Lets increase the metric for our backdoor link to 100: Lets see which interface our CE routers now want to use: Despite the higher cost, CE1 and CE2 prefer the backdoor link. Get Trained And Certified. Sorry, your blog cannot share posts by email. A Sham links is required only between two VPN sites that belong to the same area and have a backdoor link for backup purposes. Notice that R1 and R5 can see each others Fa0/0 and Fa0/1 connected networks. Toggle sidebar. (I dont think they will be providing a price break either). It creates a link that makes the MPLS PE's participating in the sham link appear as a point to point link within OSPF. A sham-link between PE-1 and PE-3 is not necessary in this configuration because the Vienna and Winchester sites do not share a backdoor link. What is OSPF sham link ? Therefore they are marked as external routes and no longer preferred by OSPF. IP address of the destination PE route in the format: ip-address [mask]. If these sites belong to the same OSPF area, the path over a backdoor link will always be selected because OSPF prefers intraarea paths to interarea paths. 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