Frame Relay DLCI

[wdalati]

Hello,

well i am facing some troubles in configuring frame relay.

i have a cisco 2621 router connected to a frame relay cloud. and i do have 2 branch offices with 1750 routers. For each connection i have an independat DLCI number and network address. I configured serial sub interface point to point and did the map on each subinterface.

From the central site, i was able to reach both sites (pinging), same as remote sites with the central site. But i want the remote sites to talk to each other without going to the layer 3 on the router. I want them to be switched on layer 2 on frame relay. The central router is carrying voice same as the branch offices. Hope that the scenario is clear.

Example Routers config are:

Central-SiteA: DLCI 100, Address 10.10.10.0/24

Central-SiteB: DLCI 200, Address 10.10.20.0/24

Is there a way for this issue?

thx in advance

[MickPhelps]

When you configure frame on p2p sub-ifs, don't use frame maps.

Try something like this:

interface serial0

no ip address

encapsulation frame-relay

!

interface serial0.100 point-to-point

ip address 10.10.10.1 255.255.255.252

frame-relay interface-dlci 100

!

interface serial0.200 point-to-point

ip address 10.10.10.5 255.255.255.252

frame-relay interface-dlci 200

!

***remote***

interface serial0

no ip address

encapsulation frame-relay

!

interface serial0.100

ip address 10.10.10.2 255.255.255.252

frame-relay interface-dlci 100

!

Hope that helps.

Mick.

[wkreidy]

Hi Wael,

you actually need to enable frame-relay switching on your hub router and switch dlci's between your two serial interfaces that are connecting to your spoke routers.

Then on the 1750, you'll be able to create a new subinterface and configure it for a separate subnet to connect the 2 branches on the network layer.

Hence your 2621 would be "acting" as a frame-relay switch wrt this particular connection.

Hope this helps.

anyway if you need more help you can call me.

regards

[svermill]

You have a hub spoke setup so you are stuck with the central site in the picture. You can go full mesh by having a new frame relay pvc set up between the remotes.

[doug.lockwood]

You have three options.

Use P-P subinterfaces and 2 subnets. This configuration requires L3 forwarding by the hub router.

Use a P-MP subinterface and one subnet. Use frame relay map commands on the spokes to have layer 2 reachability between spokes.

Add a DLCI between the remote sites. Its only money ;)

In general, point to point subinterfaes make a cleaner network. I would stay with your current configuration unless you are forced into the multipoint by your application.

Regards;

Doug

[mgnordhoff]

Sounds like you definitely need a connection directly between the 2 sites, either frame relay or leased line. Since you want to bridge between the 2 a leased line might be better because frame relay is best used for bursty traffic. Let me know if you need more info and we can discuss in greater detail.

[wdalati]

Thank you all for your support, i really got a couple of good solutions.

Wael