How to configure Frame-Relay Point-to-Point

In previous lessons I gave an introduction about frame-relay and explained how to configure frame-relay point-to-multipoint. In this lesson we’ll take a look at frame-relay point-to-point which is far easier to configure.

Let’s take a look at frame-relay point-to-point. This is the topology that we’ll use:

fr hub spoke dlci numbers

We are using the same topology with one difference. Point-to-point links require an IP Subnet per PVC:

  • Hub and Spoke1: /24
  • Hub and Spoke2: /24
Hub(config)#interface serial 0/0
Hub(config-if)#encapsulation frame-relay

Hub(config)#interface serial 0/0.1 point-to-point
Hub(config-subif)#ip address
Hub(config-subif)#frame-relay interface-dlci 102

Hub(config)#interface serial 0/0.2 point-to-point
Hub(config-subif)#ip address
Hub(config-subif)#frame-relay interface-dlci 103
Spoke1(config)#interface s0/0
Spoke1(config-if)#encapsulation frame-relay
Spoke1(config)#interface serial 0/0.1 point-to-point
Spoke1(config-subif)#ip address
Spoke1(config-subif)#frame-relay interface-dlci 201
Spoke2(config)#interface serial 0/0
Spoke2(config-if)#encapsulation frame-relay
Spoke2(config)#interface serial 0/0.1 point-to-point
Spoke2(config-subif)#ip address
Spoke2(config-subif)#frame-relay interface-dlci 301

Here is the configuration for the hub and spoke routers. You only have to specify encapsulation frame-relay on the physical interface. The rest of the commands are on the sub-interfaces. Your router can’t read your mind and find out on which sub-interfaces which DLCI’s should be so you have to configure it yourself. We don’t use the frame-relay map command for point-to-point sub-interfaces but you have to use the frame-relay interface-dlci command here.

Let’s configure RIP:

Hub(config)#router rip      
Hub(config-router)#no auto-summary 
Hub(config-router)#version 2
Spoke1(config)#interface loopback 0
Spoke1(config-if)#ip address
Spoke1(config)#router rip
Spoke1(config-router)#version 2
Spoke1(config-router)#no auto-summary
Spoke2(config)#router rip
Spoke2(config-router)#version 2
Spoke2(config-router)#no auto-summary 

And let’s see what we have in the routing tables:

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Forum Replies

  1. Hello Sims

    There are a couple of options for creating a frame relay topology.

    If you have multiple sites, you can place all routers from all the sites on one subnet like so:


    Notice that all serial interfaces are on the same subnet of This topology does not require a separate subnet for each link, but one subnet for all routers. This requires the employment of a static frame relay map to map between a next hop protocol address and a DLCI destina

    ... Continue reading in our forum

  2. Hello Rene, I am having issue to set up ospf on my frame relay in GNS3. Below is my configs and topology:


    HQ#show run int s2/0
    Building configuration...
    Current configuration : 263 bytes
    interface Serial2/0
     ip address
     encapsulation frame-relay
     ip ospf 1 area 0
     serial restart-delay 0
     frame-relay map ip 103 broadcast
     frame-relay map ip 102 broadcast
     no frame-relay inverse-arp
    HQ#show i
    ... Continue reading in our forum

  3. Hello sales2161

    If you look at this lesson, you will find information concerning the implementation of OSPF in a frame relay environment:

    Now based on your configuration, what I do see immediately is that in your frame relay interfaces, you are missing the ip ospf network broadcast command. This changes the default OSPF network type to allow for broadcasts to be sent over non broadcast topologies such as frame relay and to allow them to create OSPF adjacencies.

    Take a look at the les

    ... Continue reading in our forum

  4. Thank you very much.

  5. 100%, Thanks Laz, much appreciated

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