04-18-2006 10:48 AM
I have a quick question. We are ready to use VRF Lite but was wondering if it's possible to use the same dlci for 2 different VRF's on the same PE running frame-relay switching w/o any conflicts. Any help would be appreciated.
example on Same PE:
VRF A:
int s0.1: dlci 16
int s0.2: dlci 17
VRF B:
int s1.1: dlci 16
int s1.2: dlci 17
04-18-2006 01:02 PM
If the two serial interfaces above are connecting to the same frame-relay switch, then it will not work. This is because the frame-relay switch is not vrf or VPN aware. However, it could work if the serial interfaces were connecting to two different frame-relay switches. The layer 2 and 3 tables will be seperate on the PE, and the frame-relay switches will be aware of only one dlci for which to switch to a unique interface.
04-18-2006 11:14 PM
Hello,
I am not clearly understanding, what you would like to achieve.
FR switching allows a router to forward frames with a certain DLCI received on a specific interface to another interface. There is no VRF involved nor can two VRFs be interconnected within a router this way.
Hope this helps! Please rate all posts.
Regards, Martin
04-19-2006 05:29 AM
As you dont specify DLCIs when configuring VRFs, the question of using the same dlci numbers in different VRFs boils down to whether you can actually receive the same dlci number on different interfaces. DLCIs are per interface resources and indeed of you are connecting to two different FR switches you could receive the same number on different interfaces. This wouldnt work if you are connecting to the same switch as the switch assigns and swtiches dlcis per interface.
Herbert
04-20-2006 05:01 AM
Hello hsk10,
there is no problem on using the same DLCI on different serial interfaces even if connecting to same router acting as a frame-relay switch, because frame-relay route command is given in interface configuration mode.
You are allowed also to mix L2 and L3 functionalities on the same interface but only if they are using different DLCIs: you cannot at the same time perform FR switching and providing a VRF access link on the same DLCI.
Example:
interface Serial3/3
no ip address
encapsulation frame-relay
no fair-queue
serial restart_delay 0
frame-relay intf-type dce
frame-relay route 705 interface Serial3/2 507
frame-relay route 706 interface Serial3/5 607
!
interface Serial3/3.652 point-to-point
description FR link-l2tvp3-c3745b
ip address 33.x.x.x.255.255.252
frame-relay interface-dlci 652
!
interface Serial3/3.701 point-to-point
ip address 192.168.37.6 255.255.255.252
frame-relay interface-dlci 701
!
hope to help
giuslar
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