50. Configure Point-to-Point Frame Relay

Опубликовано: 26 Апрель 2026
на канале: ITProDan
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Configuring Point-to-Point Frame-Relay Sub interfaces

Sub interface
a virtual interface that needs a physical interface
whatever configuration on the physical interface will affect the sub interface. It
will be inherited.
to turn on all the sub interfaces, need to enable the physical interface
sub interface enables to configure multiple IP address on a single physical interface

R1:
conf t
inteface se 0/0
no ip address
encapsulation frame-relay //setting int se 0/0 and its subinterfaces no shut encapsulation to frame-relay
exit
show ip int brief //to check int status
show int se 0/0 //to check encapsulation setting
show frame-relay pvc //verify frame-relay int stats
show frame-relay lmi //check frame-relay lmi stats
show cdp neighbors //to check neighbors
conf t
int se 0/0.30 point-to-point //creating ptp sub interface via se 0/0 parent int
ip address 10.0.0.2 255.255.255.0 //setting the sub interface IP
frame-relay interface-dlci 302 //setting frame-relay dlci: info coming from ISP
exit
show ip int brief //to check newly created sub interface
show frame-relay map //to verify DLCI address
show frame-relay pvc //check pvc stats

R2:
conf t
inteface se 0/0
no ip address
encapsulation frame-relay //setting int se 0/0 and its sub interfaces
no shut encapsulation to frame-relay
exit
show ip int brief //to check int status
show int se 0/0 //to check encapsulation setting
show frame-relay pvc //verify frame-relay int stats
show frame-relay lmi //check frame-relay lmi stats
show cdp neighbors //to check neighbors
conf t
int se 0/0.10 point-to-point //creating ptp sub interface via se 0/0 parent int
ip address 10.0.0.1 255.255.255.0 //setting the sub interface IP
frame-relay interface-dlci 201 //setting frame-relay dlci: info coming from ISP
exit
show ip int brief //to check newly created sub interface
show frame-relay map //to verify DLCI address
show frame-relay pvc //check pvc stats
ping 10.0.0.2 //ping R1 since we have connectivity now
conf t
int se 0/0.20 point-to-point //creating ptp sub interface via se 0/0 parent int
ip address 20.0.0.1 255.255.255.0 //setting the sub interface IP
frame-relay interface-dlci 203 //setting frame-relay dlci: info coming from ISP
exit


R3:
conf t
inteface se 1/0
no ip address
encapsulation frame-relay //setting int se 1/0 and its sub interfaces
no shut encapsulation to frame-relay
exit
show ip int brief //to check int status
show int se 1/0 //to check encapsulation setting
show frame-relay pvc //verify frame-relay int stats
show frame-relay lmi //check frame-relay lmi stats
show cdp neighbors //to check neighbors
conf t
int se 1/0.40 point-to-point //creating ptp sub interface via se 1/0 parent int
ip address 20.0.0.2 255.255.255.0 //setting the sub interface IP
frame-relay interface-dlci 102 //setting frame-relay dlci: info coming from ISP
exit
show ip int brief //to check newly created sub interface
show frame-relay map //to verify DLCI address
show frame-relay pvc //check pvc stats
ping 20.0.0.1 //ping R1 since we have connectivity now

We are now good with the Frame-relay configuration, we are just going to add loopback networks on R1 and R3 to test routing after configuration/simulation.

R1:
conf t
int loopback 0
ip address 11.1.1.1 255.255.255.0
no shut
exit

R2:
conf t
int loopback 0
ip address 33.1.1.1 255.255.255.0
no shut
exit

Now, we are going to create routing on all routers so they can ping each others network:

R1:
router eigrp 100
network 10.0.0.0
network 11.1.1.0
no auto-summary
exit

R2:
router eigrp 100
network 10.0.0.0
network 20.0.0.0
no auto-summary
exit

R3:
router eigrp 100
network 20.0.0.0
network 33.1.1.0
no auto-summary
exit

So we have routing now as you can see on the positive ping tested ...

We have connection on the routers like leased line..

On to the next video!!