The EIGRP Over the Top feature must be configured.

• The WAN facing interface should not be in VRF.

The EIGRP Over the Top is a WAN solution with EIGRP in control plane and LISP in data plane, in which route distribution between two EIGRP customer-edge devices is performed using EIGRP protocol. LISP encapsulates the data that is sent over WAN. To support VRF functionality, the routes from each VRF must be carried over the control plane and installed in the correct VRF tables in the CE devices and EIGRP Route Reflector (E-RR).

A CE device supports multiple VRFs on a LAN. On a WAN, the WAN interface in the default VRF and the CE device forms a remote EIGRP neighborship with another CE or E-RR device. The neighbors are formed in a single EIGRP process. One EIGRP process handles multiple, distinct neighbor formations in various VRFs on the LAN side and at the same time, also forms a neighbor on the WAN side with an OTP peer. The receiving peer picks routes that are applicable for the topologies that are present on the receiving peer. Routes from any other topologies are dropped.

Various routes learnt from peers in different VRFs are updated in the respective topologies on the CE and are transported to the OTP peer with the topology information for each route. Each topology represents a configured VRF on the device.

Each topology is associated with a unique ID, called the TID (Topology ID). The TID identifies the topology across various remote customer sites as the VRF name could be different on each CE device. For the CE devices to exchange the right information, the TID must be the same on all CEs.

The LISP Id (LISP Instance ID) also is mapped to a VRF and TID. As LISP carries different VRF packets using different virtual LISP interfaces, the LISP ID per VRF must be unique and must be same across the CE devices for packet delivery.

Use the topology command to configure a unique topology ID on customer site.

Data encapsulation is achieved using LISP and is configured using the same topology command. Each VRF is associated with a LISP virtual interface. Data packets from one VRF will be encapsulated between the CE devices per VRF.

Each CE device is the edge device for a customer site, having various VRFs in a network. When customer sites connect via EIGRP OTP, each CE device is a neighbor to another CE device. In case of E-RR deployment, the CE s neighbors with the E-RR. The routes in a VRF in one customer site are carried to its peer and updated in the appropriate peer VRF table. If routes are received from a particular topology is absent in a peer, the peer drops the routes.

The E-RR reflects all topologies that are configured on the E-RR. Routes from topologies that are absent on the E-RR are not reflected. This is the reason that the E-RR is expected to have a super set of all VRFs present in the network.

When the topology command is used, all the interfaces under that VRF are enabled with EIGRP, thereby forming neighbors on all interfaces under a VRF. However, there may be interfaces on which EIGRP should not be enabled. To disable the formation of peers on such interfaces, use the topo-interface command and disable the interface on which EIGRP must not be enabled via passive-interface command.

1.    enable


2.    configure terminal


3.    router eigrp virtual-name


4.    address-family ipv4 autonomous-system as-number


5.    topology vrf vrf-name tid number lisp-instance-id number


6.    topo-interface interface-name interface-number


7.    passive-interface


8.    exit


9.    exit


10.    neighbor{ip-address | ipv6-address} interface-type interface-number [remote [lisp-encap [lisp-id]]]

11.    end


12.    show ip eigrp topology

Device> enable

Device# configure terminal

Device(config)# router eigrp test

Device(config-router)# address-family ipv4 autonomous-system 10

Device(config-router-af)# topology vrf vrf1 tid 10 lisp-instance-id 122

Device(config-router-af-topology)# #topo-interface GigabitEthernet0/0/0

Device(config-router-af-topology-interface)# passive-interface

Device(config-router-af-topology-interface)# exit

Device(config-router-af-topology)# exit

Device(config-router-af)# neighbor 10.0.0.1 ATM0/3/0 remote lisp-encap 122

Device(config-router-af)# end

Router# show ip eigrp topology

Device# show ip eigrp topology

EIGRP-IPv4 VR(otp) Topology Table for AS(1)/ID(10.0.0.11)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status
P 10.0.0.0/24, 1 successors, FD is 131072000
        via Connected, Ethernet0/1
EIGRP-IPv4 VR(otp) Topology Table for AS(1)/ID(10.0.0.11)
           Topology(red) TID(20) VRF(red)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status
P 21.0.0.0/24, 1 successors, FD is 12161609142
        via 20.0.0.11 (12161609142/12096073142), Ethernet0/1
P 1.11.11.11/32, 1 successors, FD is 12161691062
        via 20.0.0.11 (12161691062/12096155062), Ethernet0/1
P 11.0.0.0/24, 1 successors, FD is 131072000
        via Connected, Ethernet0/0
P 1.1.1.1/32, 1 successors, FD is 131153920
        via 11.0.0.10 (131153920/163840), Ethernet0/0
EIGRP-IPv4 VR(otp) Topology Table for AS(1)/ID(10.0.0.11)
           Topology(green) TID(30) VRF(green)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status
P 2.222.222.222/32, 1 successors, FD is 12161691062
        via 30.0.0.11 (12161691062/12096155062), Ethernet0/1
P 12.0.0.0/24, 1 successors, FD is 131072000
        via Connected, Ethernet0/2
P 31.0.0.0/24, 1 successors, FD is 12161609142
        via 30.0.0.11 (12161609142/12096073142), Ethernet0/1
P 11.22.11.22/32, 1 successors, FD is 12161691062
        via 30.0.0.11 (12161691062/12096155062), Ethernet0/1
P 2.2.2.2/32, 1 successors, FD is 131153920
        via 12.0.0.10 (131153920/163840), Ethernet0/2
P 22.0.0.0/24, 1 successors, FD is 12161609142
        via 20.0.0.11 (12161609142/12096073142), Ethernet0/1
P 2.22.22.22/32, 1 successors, FD is 12161691062
        via 20.0.0.11 (12161691062/12096155062), Ethernet0/1
EIGRP-IPv4 VR(otp) Topology Table for AS(1)/ID(10.0.0.11)
           Topology(blue) TID(40) VRF(blue)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status
P 13.0.0.0/24, 1 successors, FD is 131072000
        via Connected, Ethernet0/3
P 32.0.0.0/24, 1 successors, FD is 12161609142
        via 30.0.0.11 (12161609142/12096073142), Ethernet0/1
P 3.33.33.33/32, 1 successors, FD is 12161691062
        via 30.0.0.11 (12161691062/12096155062), Ethernet0/1
P 3.3.3.3/32, 1 successors, FD is 131153920
        via 13.0.0.10 (131153920/163840), Ethernet0/3

1.    enable


2.    configure terminal


3.    router eigrp virtual-name


4.    address-family ipv4 autonomous-system as-number


5.    topology vrf vrf-name tid number lisp-instance-id number


6.    exit


7.    remote-neighbors source interface-type interface-number unicast-listen lisp-encap LISP-instance-ID


8.    end

Device> enable

Device# configure terminal

Device(config)# router eigrp test

Device(config-router)# address-family ipv4 autonomous-system 10

Device((config-router-af)# topology vrf vrf1 tid 10 lisp-instance-id 122

Device((config-router-af-topology)# exit

Device(config-router-af)# remote-neighbors source ATM0/3/0 unicast-listen lisp-encap 122

Device(config-router-af)# end