Monitoring an Mpbgp Vpnv4 Table show ip bgp vpnv4 rd routedistinguisher

Router show ip bgp vpnv4 rd 103 30 203.1.127.3 BGP routing table entry for 103 30 203.1.127.3 32, version 164 Paths (1 available, best 1, table SiteA2) Not advertised to any peer Local, imported path from 103 10 203.1.127.3 32 192.168.3.101 (metric 10) from 192.168.3.101 (192.168.3.101) Origin incomplete, metric 1, localpref 100, valid, internal, best Extended Community RT 103 10

Are VPNv4 routes propagated to other PE routers

Verify with the show ip bgp vpnv4 all ip-prefix length command. Troubleshoot PE-to-PE connectivity with traditional BGP troubleshooting tools. 2004 Cisco Systems, Inc. All rights reserved. MPLS v2.1 5-7 The CE routes redistributed into MP-BGP need to be propagated to other PE routers. Verify proper route propagation with the show ip bgp vpnv4 all ip-prefix command on the remote PE router. Note Routes sent by the originating PE router might not be received by a remote PE router because of...

Show ip cef vrf

To display the CEF forwarding table associated with a VRF, use the show ip cef vrf command in privileged EXEC mode show ip cef vrf vrf-name ip-prefix mask longer-prefixes detail output-modifiers interface interface-number adjacency interface interface-number detail discard drop glean null punt output-modifiers detail output-modifiers non-recursive detail output-modifiers summary output-modifiers traffic prefix-length output-modifiers unresolved detail output-modifiers . Copyright 2004, Cisco...

Internet Access as a Separate VPN Cont

The Internet backbone is separate from the VPN backbone. VPN customers are connected to the Internet through a proper VPN VRF setup. 2004 Cisco Systems, Inc. All rights re When you implement Internet access as a separate VPN, the Internet backbone is kept separate from the MPLS VPN backbone resulting in increased security for the MPLS VPN backbone (for example, Internet hosts can reach only PE routers, but not the provider routers P routers ). The VPN customers are connected to the Internet...

Every CE router needs two links or subinterfaces to its PE router

All rights reserved. MPLS v2.1 7-8 For customers needing Internet access from every site, two physical (or logical) links between every CE router and its PE router might prove to be too complex or too expensive. Copyright 2004, Cisco Systems, Inc. Internet Access from an MPLS VPN 7-31 The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by Cisco employees for personal study. The files or printed...

Configuring a PerVrf Bgp Routing Context

This topic describes how to configure a per-VRF BGP routing context. This topic describes how to configure a per-VRF BGP routing context. Configuring per-VRF BGP Routing Context address-family ipv4 vrf vrf-name Per-VRF BGP definitions Select per-VRF BGP context with the address-family command. Configure CE EBGP neighbors in the VRF context, not in the global BGP configuration. CE neighbors have to be activated with the neighbor activate command. 2004 Cisco Systems, Inc. All rights reserved.MPLS...

Show ip bgp vpnv4 vrf

To display VPNv4 information from the BGP database associated with a VRF, use the show ip bgp vpnv4 vrf command in privileged EXEC mode show ip bgp vpnv4 vrf vrf-name ip-prefix length longer-prefixes output-modifiers network-address mask longer-prefixes output-modifiers cidr-only community community-list dampened-paths filter-list flap-statistics inconsistent-as neighbors paths line peer-group quote-regexp regexp summary tags . This table describes the syntax for the show ip bgp vpnv4 vrf...

After this operation the provider AS number is prepended to the AS path

All rights reserved. MPLS v2.1 5-12 The modified AS path update procedure is called AS-override, which is described here The procedure is used only if the first AS number in the AS path is equal to the AS number of the receiving BGP router. In this case, all leading occurrences of the AS number of the receiving BGP router are replaced with the AS number of the sending BGP router. Occurrences further down the AS path of the AS number of the receiving router are not...

Example DHCP Relay Shared DHCP Server

In this figure, the corporate DHCP server has been replaced with a shared DHCP server provided by the service provider. Because the server is shared between VPNs, a NAT PE router could also be included to provide address translation. The client broadcasts a DHCP request to the local relay. The local relay converts the broadcast to a unicast request for the shared DHCP server and adds the VPN ID. This request is forwarded to the egress PE router via the NAT PE router based upon the DHCP server...

Example Overlapping VPNsConfiguration Tasks

This situation requires at least the following four VRFs A-Spoke-1 and A-Spoke-2 are members of VPN-A only. (They need two VRFs because they are not connected to the same PE router they can, however, use the same RD.) B-Spoke-1 and B-Spoke-2 are members of VPN-B only. (They need two VRFs because they are not connected to the same PE router they can, however, use the same RD.) A-Central is a member of VPN-A and overlapping VPN-AB. (They need an additional...

OnDemand Address Pools VRF Pool Example

Mpls Implementation

On the PE router, a DHCP pool named A_pool has been created. This pool is associated with VPN A. Three new commands have been introduced to the DHCP command presented in the previous topic. To configure an address pool as an ODAP, use the origin command. The subnet size initial size option is used to set the initial size of the first requested subnetwork. You can enter size as either the subnet mask (nnnn.nnnn.nnnn.nnnn) or prefix size ( nn). The autogrow size option is used to specify that the...

Set of import and export route targets

All rights reserved. MPLS v2.1 5-3 The major data structure associated with MPLS VPN implementation on Cisco IOS platforms is the VRF table. This data structure encompasses an IP routing table identical in function to the following The global IP routing table in Cisco IOS software A Cisco Express Forwarding (CEF) table identical in function to the global CEF forwarding table (Forwarding Information Base FIB ) Specifications for routing protocols running inside the VRF...

Need for Routing Protocol Contexts

There are two backbones with overlapping addresses. There are two backbones with overlapping addresses. RIP in VPN A has to be different from RIP Cisco IOS software supports only one RIP process per router. 2004 Cisco Systems, Inc. All rights re Traditional Cisco IOS software can support a number of different routing protocols. In some cases, even several completely isolated copies of the same routing protocol are supported. For example, several Open Shortest Path First (OSPF) processes can be...

Configure redistribution of OSPF into MPBGP

To configure OSPF as a PE-CE routing protocol, you need to start a separate OSPF process for each VRF in which you want to run OSPF. The per-VRF OSPF process is configured in the same way as a standard OSPF process. You can use all of the OSPF features that are available in Cisco IOS software. You need to redistribute OSPF routes into BGP and redistribute BGP routes into OSPF if necessary. Alternatively, you can originate a default route into a per-VRF OSPF process by using the...

With MPLS managed services ISPs can provide additional centralized services that are integrated with existing VPN

All rights reserved. MPLS v2.1 6-5 Market forces continually drive service providers to provide more complex centralized services for their customers. These services, such as advanced VRF import and export features, overlapping VPNs, and central services VPNs, help to meet service requirements and provide VPN solutions and topologies. For additional information, refer to these resources Access Cisco.com for additional information about VPNs. VPNs...

What Is DHCP Relay

This topic describes the features of managed DHCP relay services in an MPLS VPN environment. Current implementations of DHCP suffer from the following issues Even if the DHCP servers are collocated, there is a replication of DHCP servers per VPN. There is no added value from the service provider. 6-54 Implementing Cisco MPLS (MPLS) v2.1 Copyright 2004, Cisco Systems, Inc. The PDF files and any printed representation for this material are the property of Cisco Systems, Inc., for the sole use by...

Configuring RTs in a Central Services and Simple VPN

Configure the customer VPN import-export route target in all VRFs participating in customer VPN. Configure a unique import-export route target in every VRF that is only a client of central servers. Configure the central services import and export route targets in VRFs that participate in central services VPN. 2004 Cisco Systems, Inc. All rights reserved. MPLS v2.1 6-12 This table shows an RD and RT numbering scheme for PE-1. 6-34 Implementing Cisco MPLS (MPLS) v2.1 Copyright 2004, Cisco...

Configuring Route Targets

Configure the per-customer import-export route target in all customer VRFs. Configure the NMS import-export route target in NMS VRF. Import routes with the NMS RT into the customer VRF. Export loopback addresses from customer VRF with RT NMS_Client. Import routes with RT NMS_Client into NMS VRF. 2004 Cisco Systems, Inc. All rights reserved. MPLS v2.1 6-5 This table shows an RD and RT numbering scheme for PE-1. This table shows an RD and RT numbering scheme for PE-CS. PE-CS RD and RT Numbering...

Show ip route vrf

To display the IP routing table associated with a VRF, use the show ip route vrf command in EXEC mode show ip route vrf vrf-name connected protocol as-number tag output-modifiers list number output-modifiers profile static output-modifiers summary output-modifiers supernets-only output-modifiers traffic-engineering output-modifiers . This table describes the parameters for the show ip route vrf command. Syntax Description (Optional) Displays all connected routes in a VRF. (Optional) To specify...

Example Sample Output from show ip bgp neighbors Command

This table describes the fields shown in the sample output. IP address of the BGP neighbor and its AS number. If the neighbor is in the same AS as the router, the link between them is internal otherwise, the link is considered external. Indicates that this peer is either an EBGP peer or an IBGP peer. BGP version being used to communicate with the remote router. The router ID (an IP address) of the neighbor is also specified. Internal state of this BGP connection. Amount of time, in seconds,...

Example OSPF Superbackbone Implementation

The sending PE router redistributes the OSPF route into MP-BGP, copies the OSPF cost into the MED attribute, and sets the BGP extended community to indicate the LSA type from which the route was derived. The receiving PE router redistributes the MP-BGP route back into OSPF and uses the original LSA type and the MED attribute to generate an interarea summary LSA. An interarea summary LSA is always generated because the receiving PE router acts as an ABR between the superbackbone and the OSPF...

Configuring Selective VRF Export Cont

Ip vrf Site_A rd 115 317 export map RTMAP route-target both 115 317 ip vrf Site_A rd 115 317 export map RTMAP route-target both 115 317 access-list 10 permit 192.168.30.0 0.0.0.0 route-map RTMAP permit 20 match ip address 10 set extcommunity rt 115 273 additive In the earlier example, selective import of routes into a VRF was achieved with an import route map in the receiving VRF that allowed only routes from a certain address block to be inserted into the VRF. In this example, routes from a...

Example Overlapping VPN Routing

The figure shows how to implement overlapping VPNs. For site A-1 and site A-2 (participating only in VPN-A), do the following Export all networks with RT 123 750 Import all networks that carry RT 123 750 (VPN-A) For site B-1 and site B-2 (participating only in VPN-B), do the following Export all networks with RT 123 760 Import all networks that carry RT 123 760 (VPN-B) For site A-Central (participating in VPN-A and the overlapping VPN), do the following Exports all networks with RTs 123 750 and...

OSPF cost is copied into MED attribute

The OSPF superbackbone is implemented with the help of several BGP attributes. A new BGP extended community was defined to carry OSPF route type and OSPF area across the BGP backbone. The format of this community is defined in this table. This field carries the OSPF area from which the route was redistributed into MP-BGP. This field carries the OSPF LSA type from which the route was redistributed into MP-BGP. This field is used for external metric type. The low-order bit is set for external 2...

Module Self Check

Use the questions here to review what you learned in this module. The correct answers and solutions are found in the Module Self-Check Answer Key. Q1) Why do you need a selective VRF import command (Source Using Advanced VRF Import and Export Features) Q2) How does the import route map affect the VRF import process (Source Using Advanced VRF Import and Export Features) Q3) Why do you need a selective VRF export command (Source Using Advanced VRF Import and Export Features) Q4) How does the...

Steps for Configuring a Central Services VPN

Separate VRF per client site Separate VRF per client site A unique RD on each client site Import and export routes with an RT that is the same value as the RD for each client site (VPN of client) Export routes with an RT (clients-to-server) associated with the server site Import routes with the RT (server-to-clients) into client VRFs 2004 Cisco Systems, Inc. All rights reserved. MPLS v2.1 6-6 To configure a central services VPN, you need to address the following requirements You need a...

Module Self Check Answer

Q2) Because with routing protocols such as RIP and BGP, only a single copy of the protocol may be running in the router. Q4) False. Interfaces are assigned to a VRF. Q5) D Q6) VPNv4 routers are redistributed from the global BGP table to the per-instance BGP table and then to the per-instance RIP, which is propagated to the CE router. Q12) EBGP is used to carry routing updates between the PE router and the CE router. IBGP (VNPv4) is used to carry VPN route updates between PE routers. Note IBGP...

Monitoring VRF Routing

This topic describes how to monitor VRF routing. This topic describes how to monitor VRF routing. Displays the routing protocols configured in a VRF. Displays per-VRF BGP parameters. Cisco Systems, Inc. All rights reserved. MPLS v2.1 The following three commands can be used to monitor VRF routing The show ip protocols vrf command displays the summary information about routing protocols running in a VRF. The show ip route vrf command displays the VRF routing table. The show ip bgp vpnv4 vrf...