12-11-2001 04:10 PM - edited 03-01-2019 07:42 PM
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
12-11-2001 05:17 PM
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.
12-11-2001 11:09 PM
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
12-12-2001 08:41 AM
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.
12-12-2001 09:05 AM
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
12-13-2001 01:51 PM
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.
12-17-2001 03:24 PM
Thank you all for your support, i really got a couple of good solutions.
Wael
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