11-14-2008 06:22 PM - edited 03-06-2019 02:29 AM
Hi Everyone,
I am having trouble with packet tracer 5, I cant create sun-interfaces on serial links
I can do it on Ethernet links no probs just the serial..
Is it supported??
int ser 0/0
encapsulation frame relay ietf
frame relay lmi-type ansi
no ip address
no shut
exit
int ser 0/0.120
%cannot create sub-interface
help please
Shane
11-14-2008 08:07 PM
From Frame-Relay subinterface, you need to select either a point-to-point or point-to-multipoint mode.
Just use the online help while typing interface s0/0.120 ?
HTH,
__
Edison.
11-16-2008 05:30 PM
int ser 0/0
encapsulation frame relay
no ip address
no shut
exit
int ser 0/0.120 point-to-point
%cannot create Frame Relay sub-interface
anybody have any idea what is going on or does packet tracer 5 not support sub-interfaces on serial links
11-16-2008 06:42 PM
Shane
A detail that I notice is that in both your posts you have indicated in your config:
encapsulation frame relay
which should be:
encapsulation frame-relay
I am not sure whether that is a cosmetic issue (which seems likely given that the error message in this post is clear that it recognizes that it is dealing with Frame Relay (cannot create Frame Relay sub-interface)) or whether the packet tracer really has problems creating Frame Relay subinterfaces. If you correct the syntax and the problem persists then I would be suspicious that it is an issue in packet tracer.
HTH
Rick
02-10-2011 05:31 AM
Hey Shane,
I have Packet Tracer and I encountered the same problem. The solution is easy.
Actually, you are able to create a sub-interface on a serial link in Packet Tracer only if the encapsulation type is set to frame-relay.
You must also include the "multipoint" or "point-to-point" parameter when creating the subinterface.
For example:
R1# conf t
R1(config)# interface serial 0/0
R1(config-if)# encapsulation frame-relay
R1(config-if)# interface serial 0/0.123 point-to-point
OR
R1(config-if)# interface serial 0/0.123 multi-point
R1(config-subif)#
Router>en
Router#Conf t
Router(config)#interface serial0/0.102 point-to-point
To create a multipoint subinterface, enter multipoint instead:
Router(config)#interface serial0/0.1 multipoint
Now two things to keep in mind, first you have to put a dot right after the serial interface and specify the sub-interface number (serial0/0.102, serial0/0.103, serial0/0.104, etc...).
Second thing is you HAVE to specify afterward if it is a point-to-point or multipoint.
Here is an example of Frame Relay configuration:
a. Create and configure subinterface s0/0/0.102. From global configuration mode, enter the following commands:
R1(config)# interface Serial0/0/0.102 point-to-point
R1(config-subif)# ip address 10.0.1.1 255.255.255.252
R1(config-subif)# frame-relay interface-dlci 102
R1(config-subif)# exit
b. Repeat the above steps to create and configure subinterface s0/0/0.103 and s0/0/0.104.
R1(config)# interface Serial0/0/0.103 point-to-point
R1(config-subif)# ip address 10.0.1.5 255.255.255.252
R1(config-subif)# frame-relay interface-dlci 103
R1(config-subif)# exit
R1(config)# interface Serial0/0/0.104 point-to-point
R1(config-subif)# ip address 10.0.1.9 255.255.255.252
R1(config-subif)# frame-relay interface-dlci 104
R1(config-subif)# exit
Hope that helps.
02-16-2011 05:32 PM
Some very thorough and helpful posts, but my class cannot even get the frame-relay intf-type dce command to go through. It rejects every time. Sub-interface commands work fine, but the intf-type won't take.
Any help?
Thanks.
Also, why have they not fixed the course information to reflect the info needed?
09-13-2013 10:52 AM
At this point the original question should be marked "Answered." As other posters here have noted, Packet Tracer 5 does support sub-interfaces so long as the command to create that interface is followed with multipoint or point-to-point.
But the last issue brought up about specifying the frame-relay encapsulation type (ietf vs Cisco) still seems unanswered.
In Packet Tracer it appears that you are able to specify ietf if you want to use RFC1490/RFC2427 encapsulation.
R0(config-if)#encapsulation frame-relay ?
ietf Use RFC1490/RFC2427 encapsulation
Am I right to assume that taking the default
R0(config-if)#encapsulation frame-relay ietf
R0(config-if)#do show int s0/0
Serial0/0 is up, line protocol is up (connected)
Hardware is HD64570
MTU 1500 bytes, BW 128 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation Frame Relay, loopback not set, keepalive set (10 sec)
R0(config-if)#encapsulation frame-relay
R0(config-if)#do show int s0/0
Serial0/0 is up, line protocol is up (connected)
Hardware is HD64570
MTU 1500 bytes, BW 128 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation Frame Relay, loopback not set, keepalive set (10 sec)
I need to get to some live equipment!!!
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