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20-31
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 20 Configuring Frame Relay to ATM Interworking Port Adapter Interfaces
Configuring Frame Relay to ATM Virtual Connections
Configuring Frame Relay Transit PVCs
This section describes configuring internal cross-connect Frame Relay to Frame Relay transit permanent
virtual channels (PVCs). This type of PVC is used to establish a bidirectional facility to transfer Frame
Relay traffic between two Frame Relay users. Figure 20-6 shows a Frame Relay transit PVC between
Frame Relay users A and D.
Figure 20-6 Transit PVC Example
To configure a Frame Relay transit PVC, perform the following steps, beginning in global configuration
mode:
Examples
The following example shows how to configure the internal cross-connect Frame Relay PVC on
Switch B between serial interface 0/1/0:5, DLCI = 43, and serial interface 3/0/2:6, DLCI = 100:
Switch-B(config)# interface serial 0/1/0:5
Switch-B(config-if)# frame-relay pvc 43 interface serial 3/0/2:6 100
The following example shows how to configure the internal cross-connect Frame Relay on Switch C
between serial interface 4/1/0:2, DLCI = 100,0 and serial interface 0/0/1:12, DLCI = 255:
Switch-C(config)# interface serial 4/1/0:2
Switch-C(config-if)# frame-relay pvc 100 interface serial 0/0/1:12 255
Each subsequent VC cross-connection and link must be configured until the VC is terminated to create
the entire VCC.
To display Frame Relay transit PVCs, use the show interfaces and show vc commands.
User A
VCC
VCL
s0/1/0:5
DLCI = 43
VCLVCL
s0/0/1:12
DLCI = 255
s4/1/0:2
s3/0/2:6
DLCI = 100
Switch B Switch C
User D
15056
Command Purpose
Step 1
Switch(config)# interface serial
card/subcard/port:cgn
Switch(config-if)#
Selects the interface to be configured.
Step 2
Switch(config-if)# frame-relay pvc dlci
[accept-overflow {enable | disable | inherit}]
1
[upc {pass | tag-drop}] [rx-cttr index] [tx-cttr
index] interface serial card/subcard/port:cgn dlci
dlci [accept-overflow {enable | disable |
inherit}] [upc {pass | tag-drop}] [rx-cttr index]
[tx-cttr index]
1. The overflow queuing option is described in the section, Configuring Overflow Queuing, page 20-43.
Configures a Frame Relay to Frame Relay transit
PVC.