CISCO 2801 with vwic-2mft-t1/e1 - PPP Encapsulation

[Ahmed Abdulla Mohammed Sallam]

Good Morning Colleagues

I hope you are doing good and safe.

I have an old CISCO 2801 router with vwic-2mft-t1/e1 . I need to connect it to Patton 2603 (which is E1 router with Ethernet LAN interface) using PPP.

I have testing connecting both devices using frame replay and connection done successfully and traffic can passed as expected.

For PPP configuration , Below is my CISCO configuration:

isdn switch-type primary-net5

controller E1 0/1/0
framing NO-CRC4
channel-group 0 timeslots 1-31
!

interface Serial0/1/0:0
no ip address
encapsulation ppp

Once configuration done at CISCO side & Patton side , Line protocol at serial interface at CISCO keep up & down every 2 seconds

*Apr 4 08:48:22.918: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to up
*Apr 4 08:48:24.934: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to down

Do you have any idea what is the reason for this ?

Best Regards

[Georg Pauwen]

Hello,

I think you need the two lines marked in bold (toggle the values available to check what works):

controller E1 0/1/0
framing NO-CRC4
--> linecode b8zs
--> clock source line independent
channel-group 0 timeslots 1-31

[Ahmed Abdulla Mohammed Sallam]

Good Afternoon Georg

Thx for your replay . The controller is already up . I am using linecode HDB3 & Clock source is line . Below is the output of

"show controllers e1 0/1/0:0"

E1 0/1/0 is up.
Applique type is Channelized E1 - balanced
No alarms detected.
alarm-trigger is not set
Version info Firmware: 20100222, FPGA: 13, spm_count = 0
Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.

Kindly let me know if you have any other thoughts that can help.

Best Regards

[Georg Pauwen]

Hello,

I guess if Frame Relay works, the underlying connectivity is not the problem, but the encapsulation is. I am not familiar with Patton routers, what are the encapsulation options for PPP ?

[Ahmed Abdulla Mohammed Sallam]

Hi Georg

Thx for your replay . Below are the encapsulation options for Patton:

• PPPoE: Point-to-Point Protocol over Ethernet
• Frame Relay
• PPP: Point-to-Point Protocol over HDLC

Best Regards

[Georg Pauwen]

Hello,

turn on debugging on the Cisco side and post the output:

debug ppp negotiation

[Ahmed Abdulla Mohammed Sallam]

Good Afternoon Georg

Thx for your replay . HYG:

Router#debug ppp negotiation
PPP protocol negotiation debugging is on
Router#
*Apr 4 19:08:38.334: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to up
*Apr 4 19:08:40.346: Se0/1/0:0 LCP: Event[Timeout-] State[Stopping to Stopped]
*Apr 4 19:08:40.346: Se0/1/0:0 LCP: Event[DOWN] State[Stopped to Starting]
*Apr 4 19:08:40.346: Se0/1/0:0 PPP: Phase is DOWN
*Apr 4 19:08:40.350: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to down
*Apr 4 19:08:42.346: Se0/1/0:0 PPP: Sending cstate UP notification
*Apr 4 19:08:42.346: Se0/1/0:0 PPP: Processing CstateUp message
*Apr 4 19:08:42.350: PPP: Alloc Context [6884DF48]
*Apr 4 19:08:42.350: ppp7 PPP: Phase is ESTABLISHING
*Apr 4 19:08:42.350: Se0/1/0:0 PPP: Using default call direction
*Apr 4 19:08:42.350: Se0/1/0:0 PPP: Treating connection as a dedicated line
*Apr 4 19:08:42.350: Se0/1/0:0 PPP: Session handle[6E000007] Session id[7]
*Apr 4 19:08:42.350: Se0/1/0:0 LCP: Event[OPEN] State[Initial to Starting]
*Apr 4 19:08:42.350: Se0/1/0:0 LCP: O CONFREQ [Starting] id 1 len 10
*Apr 4 19:08:42.350: Se0/1/0:0 LCP: MagicNumber 0x28785387 (0x050628785387)
*Apr 4 19:08:42.350: Se0/1/0:0 LCP: Event[UP] State[Starting to REQsent]
*Apr 4 19:08:42.350: Se0/1/0:0 LCP: I CONFREQ [REQsent] id 32 len 8
*Apr 4 19:08:42.350: Se0/1/0:0 LCP: MRU 1520 (0x010405F0)
*Apr 4 19:08:42.350: Se0/1/0:0 LCP: O CONFACK [REQsent] id 32 len 8
*Apr 4 19:08:42.354: Se0/1/0:0 LCP: MRU 1520 (0x010405F0)
*Apr 4 19:08:42.354: Se0/1/0:0 LCP: Event[Receive ConfReq+] State[REQsent to AC
Ksent]
*Apr 4 19:08:44.346: Se0/1/0:0 LCP: O CONFREQ [ACKsent] id 2 len 10
*Apr 4 19:08:44.346: Se0/1/0:0 LCP: MagicNumber 0x28785387 (0x050628785387)
*Apr 4 19:08:44.346: Se0/1/0:0 LCP: Event[Timeout+] State[ACKsent to ACKsent]
*Apr 4 19:08:44.346: Se0/1/0:0 LCP: I CONFACK [ACKsent] id 2 len 10
*Apr 4 19:08:44.346: Se0/1/0:0 LCP: MagicNumber 0x28785387 (0x050628785387)
*Apr 4 19:08:44.346: Se0/1/0:0 LCP: Event[Receive ConfAck] State[ACKsent to Ope
n]
*Apr 4 19:08:44.346: Se0/1/0:0 PPP: Queue BCP code[1] id[7]
*Apr 4 19:08:44.378: Se0/1/0:0 PPP: Phase is FORWARDING, Attempting Forward
*Apr 4 19:08:44.378: Se0/1/0:0 LCP: State is Open
*Apr 4 19:08:44.378: Se0/1/0:0 PPP: Phase is ESTABLISHING, Finish LCP
*Apr 4 19:08:44.378: Se0/1/0:0 PPP: Phase is UP
*Apr 4 19:08:44.378: Se0/1/0:0 CDPCP: Protocol configured, start CP. state[Init
ial]
*Apr 4 19:08:44.378: Se0/1/0:0 CDPCP: Event[OPEN] State[Initial to Starting]
*Apr 4 19:08:44.382: Se0/1/0:0 CDPCP: O CONFREQ [Starting] id 1 len 4
*Apr 4 19:08:44.382: Se0/1/0:0 CDPCP: Event[UP] State[Starting to REQsent]
*Apr 4 19:08:44.382: Se0/1/0:0 PPP: Process pending ncp packets
*Apr 4 19:08:44.382: Se0/1/0:0 BCP: Redirect packet to Se0/1/0:0
*Apr 4 19:08:44.382: Se0/1/0:0 BCP: I CONFREQ [UNKNOWN] id 7 len 4
*Apr 4 19:08:44.382: Se0/1/0:0 LCP: O PROTREJ [Open] id 3 len 10 protocol BCP (
0x01070006)
*Apr 4 19:08:44.382: Se0/1/0:0 LCP: I PROTREJ [Open] id 6 len 10 protocol CDPCP
(0x01010004)
*Apr 4 19:08:44.382: Se0/1/0:0 CDPCP: Event[Receive CodeRej-] State[REQsent to
Stopped]
*Apr 4 19:08:44.382: Se0/1/0:0 LCP: I TERMREQ [Open] id 33 len 4
*Apr 4 19:08:44.382: Se0/1/0:0 PPP DISC: Received LCP TERMREQ from peer
*Apr 4 19:08:44.382: PPP: NET STOP send to AAA.
*Apr 4 19:08:44.382: Se0/1/0:0 PPP: Phase is TERMINATING
*Apr 4 19:08:44.382: Se0/1/0:0 CDPCP: Event[DOWN] State[Stopped to Starting]
*Apr 4 19:08:44.382: Se0/1/0:0 CDPCP: Event[CLOSE] State[Starting to Initial]
*Apr 4 19:08:44.386: Se0/1/0:0 LCP: O TERMACK [Open] id 33 len 4
*Apr 4 19:08:44.386: Se0/1/0:0 LCP: Event[Receive TermReq] State[Open to Stoppi
ng]
*Apr 4 19:08:44.386: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to up
*Apr 4 19:08:44.386: Se0/1/0:0 PPP: Outbound cdp packet dropped, line protocol
not up
*Apr 4 19:08:46.394: Se0/1/0:0 LCP: Event[Timeout-] State[Stopping to Stopped]
*Apr 4 19:08:46.394: Se0/1/0:0 LCP: Event[DOWN] State[Stopped to Starting]
*Apr 4 19:08:46.394: Se0/1/0:0 PPP: Phase is DOWN
*Apr 4 19:08:46.398: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to down
*Apr 4 19:08:48.394: Se0/1/0:0 PPP: Sending cstate UP notification
*Apr 4 19:08:48.394: Se0/1/0:0 PPP: Processing CstateUp message
*Apr 4 19:08:48.398: PPP: Alloc Context [6884DF48]
*Apr 4 19:08:48.398: ppp8 PPP: Phase is ESTABLISHING
*Apr 4 19:08:48.398: Se0/1/0:0 PPP: Using default call direction
*Apr 4 19:08:48.398: Se0/1/0:0 PPP: Treating connection as a dedicated line
*Apr 4 19:08:48.398: Se0/1/0:0 PPP: Session handle[87000008] Session id[8]
*Apr 4 19:08:48.398: Se0/1/0:0 LCP: Event[OPEN] State[Initial to Starting]
*Apr 4 19:08:48.398: Se0/1/0:0 LCP: O CONFREQ [Starting] id 1 len 10
*Apr 4 19:08:48.398: Se0/1/0:0 LCP: MagicNumber 0x28786B29 (0x050628786B29)
*Apr 4 19:08:48.398: Se0/1/0:0 LCP: Event[UP] State[Starting to REQsent]
*Apr 4 19:08:48.398: Se0/1/0:0 LCP: I CONFREQ [REQsent] id 34 len 8
*Apr 4 19:08:48.398: Se0/1/0:0 LCP: MRU 1520 (0x010405F0)
*Apr 4 19:08:48.402: Se0/1/0:0 LCP: O CONFACK [REQsent] id 34 len 8
*Apr 4 19:08:48.402: Se0/1/0:0 LCP: MRU 1520 (0x010405F0)
*Apr 4 19:08:48.402: Se0/1/0:0 LCP: Event[Receive ConfReq+] State[REQsent to AC
Ksent]
*Apr 4 19:08:50.394: Se0/1/0:0 LCP: O CONFREQ [ACKsent] id 2 len 10
*Apr 4 19:08:50.394: Se0/1/0:0 LCP: MagicNumber 0x28786B29 (0x050628786B29)
*Apr 4 19:08:50.394: Se0/1/0:0 LCP: Event[Timeout+] State[ACKsent to ACKsent]
*Apr 4 19:08:50.394: Se0/1/0:0 LCP: I CONFACK [ACKsent] id 2 len 10
*Apr 4 19:08:50.394: Se0/1/0:0 LCP: MagicNumber 0x28786B29 (0x050628786B29)
*Apr 4 19:08:50.394: Se0/1/0:0 LCP: Event[Receive ConfAck] State[ACKsent to Ope
n]
*Apr 4 19:08:50.394: Se0/1/0:0 PPP: Queue BCP code[1] id[8]
*Apr 4 19:08:50.426: Se0/1/0:0 PPP: Phase is FORWARDING, Attempting Forward
*Apr 4 19:08:50.426: Se0/1/0:0 LCP: State is Open
*Apr 4 19:08:50.426: Se0/1/0:0 PPP: Phase is ESTABLISHING, Finish LCP
*Apr 4 19:08:50.426: Se0/1/0:0 PPP: Phase is UP
*Apr 4 19:08:50.426: Se0/1/0:0 CDPCP: Protocol configured, start CP. state[Init
ial]
*Apr 4 19:08:50.426: Se0/1/0:0 CDPCP: Event[OPEN] State[Initial to Starting]
*Apr 4 19:08:50.430: Se0/1/0:0 CDPCP: O CONFREQ [Starting] id 1 len 4
*Apr 4 19:08:50.430: Se0/1/0:0 CDPCP: Event[UP] State[Starting to REQsent]
*Apr 4 19:08:50.430: Se0/1/0:0 PPP: Process pending ncp packets
*Apr 4 19:08:50.430: Se0/1/0:0 BCP: Redirect packet to Se0/1/0:0
*Apr 4 19:08:50.430: Se0/1/0:0 BCP: I CONFREQ [UNKNOWN] id 8 len 4
*Apr 4 19:08:50.430: Se0/1/0:0 LCP: O PROTREJ [Open] id 3 len 10 protocol BCP (
0x01080006)
*Apr 4 19:08:50.430: Se0/1/0:0 LCP: I PROTREJ [Open] id 7 len 10 protocol CDPCP
(0x01010004)
*Apr 4 19:08:50.430: Se0/1/0:0 CDPCP: Event[Receive CodeRej-] State[REQsent to
Stopped]
*Apr 4 19:08:50.430: Se0/1/0:0 LCP: I TERMREQ [Open] id 35 len 4
*Apr 4 19:08:50.430: Se0/1/0:0 PPP DISC: Received LCP TERMREQ from peer
*Apr 4 19:08:50.430: PPP: NET STOP send to AAA.
*Apr 4 19:08:50.430: Se0/1/0:0 PPP: Phase is TERMINATING
*Apr 4 19:08:50.430: Se0/1/0:0 CDPCP: Event[DOWN] State[Stopped to Starting]
*Apr 4 19:08:50.430: Se0/1/0:0 CDPCP: Event[CLOSE] State[Starting to Initial]
*Apr 4 19:08:50.434: Se0/1/0:0 LCP: O TERMACK [Open] id 35 len 4
*Apr 4 19:08:50.434: Se0/1/0:0 LCP: Event[Receive TermReq] State[Open to Stoppi
ng]
*Apr 4 19:08:50.434: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to up
*Apr 4 19:08:50.434: Se0/1/0:0 PPP: Outbound cdp packet dropped, line protocol
not up
*Apr 4 19:08:52.250: Se0/1/0:0 LCP: I CONFREQ [Stopping] id 36 len 8
*Apr 4 19:08:52.250: Se0/1/0:0 LCP: MRU 1520 (0x010405F0)
*Apr 4 19:08:52.250: Se0/1/0:0 LCP: Event[Receive ConfReq+] State[Stopping to S
topping]
*Apr 4 19:08:52.442: Se0/1/0:0 LCP: Event[Timeout-] State[Stopping to Stopped]
*Apr 4 19:08:52.442: Se0/1/0:0 LCP: Event[DOWN] State[Stopped to Starting]
*Apr 4 19:08:52.442: Se0/1/0:0 PPP: Phase is DOWNu
*Apr 4 19:08:52.446: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to downndeb
*Apr 4 19:08:54.442: Se0/1/0:0 PPP: Sending cstate UP notification
*Apr 4 19:08:54.442: Se0/1/0:0 PPP: Processing CstateUp message
*Apr 4 19:08:54.446: PPP: Alloc Context [6884DF48]
*Apr 4 19:08:54.446: ppp9 PPP: Phase is ESTABLISHING
*Apr 4 19:08:54.446: Se0/1/0:0 PPP: Using default call direction
*Apr 4 19:08:54.446: Se0/1/0:0 PPP: Treating connection as a dedicated line
*Apr 4 19:08:54.446: Se0/1/0:0 PPP: Session handle[45000009] Session id[9]
*Apr 4 19:08:54.446: Se0/1/0:0 LCP: Event[OPEN] State[Initial to Starting]
*Apr 4 19:08:54.446: Se0/1/0:0 LCP: O CONFREQ [Starting] id 1 len 10
*Apr 4 19:08:54.446: Se0/1/0:0 LCP: MagicNumber 0x287882CB (0x0506287882CB)
*Apr 4 19:08:54.446: Se0/1/0:0 LCP: Event[UP] State[Starting to REQsent]
*Apr 4 19:08:54.446: Se0/1/0:0 LCP: I CONFACK [REQsent] id 1 len 10
*Apr 4 19:08:54.446: Se0/1/0:0 LCP: MagicNumber 0x287882CB (0x0506287882CB)
*Apr 4 19:08:54.446: Se0/1/0:0 LCP: Event[Receive ConfAck] State[REQsent to ACK
rcvd]
*Apr 4 19:08:55.250: Se0/1/0:0 LCP: I CONFREQ [ACKrcvd] id 37 len 8
*Apr 4 19:08:55.250: Se0/1/0:0 LCP: MRU 1520 (0x010405F0)
*Apr 4 19:08:55.254: Se0/1/0:0 LCP: O CONFACK [ACKrcvd] id 37 len 8
*Apr 4 19:08:55.254: Se0/1/0:0 LCP: MRU 1520 (0x010405F0)
*Apr 4 19:08:55.254: Se0/1/0:0 LCP: Event[Receive ConfReq+] State[ACKrcvd to Op
en]
*Apr 4 19:08:55.254: Se0/1/0:0 PPP: Queue BCP code[1] id[9]
*Apr 4 19:08:55.258: Se0/1/0:0 PPP: Phase is FORWARDING, Attempting Forward
*Apr 4 19:08:55.258: Se0/1/0:0 LCP: State is Open
*Apr 4 19:08:55.258: Se0/1/0:0 PPP: Phase is ESTABLISHING, Finish LCP
*Apr 4 19:08:55.258: Se0/1/0:0 PPP: Phase is UP
*Apr 4 19:08:55.258: Se0/1/0:0 CDPCP: Protocol configured, start CP. state[Init
ial]
*Apr 4 19:08:55.262: Se0/1/0:0 CDPCP: Event[OPEN] State[Initial to Starting]
*Apr 4 19:08:55.262: Se0/1/0:0 CDPCP: O CONFREQ [Starting] id 1 len 4
*Apr 4 19:08:55.262: Se0/1/0:0 CDPCP: Event[UP] State[Starting to REQsent]
*Apr 4 19:08:55.262: Se0/1/0:0 PPP: Process pending ncp pauckets
*Apr 4 19:08:55.262: Se0/1/0:0 BCP: Redirect packet to Se0/1/0:0
*Apr 4 19:08:55.262: Se0/1/0:0 BCP: I CONFREQ [UNKNOWN] id 9 len 4
*Apr 4 19:08:55.262: Se0/1/0:0 LCP: O PROTREJ [Open] id 2 len 10 protocol BCP (
0x01090006)
*Apr 4 19:08:55.262: Se0/1/0:0 LCP: I PROTREJ [Open] id 8 len 10 protocol CDPCP
(0x01010004)
*Apr 4 19:08:55.262: Se0/1/0:0 CDPCP: Event[Receive CodeRej-] State[REQsent to
Stopped]
*Apr 4 19:08:55.262: Se0/1/0:0 LCP: I TERMREQ [Open] id 38 len 4
*Apr 4 19:08:55.262: Se0/1/0:0 PPP DISC: Received LCP TERMREQ from peer
*Apr 4 19:08:55.262: PPP: NET STOP send to AAA.
*Apr 4 19:08:55.262: Se0/1/0:0 PPP: Phase is TERMINATING
*Apr 4 19:08:55.262: Se0/1/0:0 CDPCP: Event[DOWN] State[Stopped to Starting]
*Apr 4 19:08:55.262: Se0/1/0:0 CDPCP: Event[CLOSE] State[Starting to Initial]
*Apr 4 19:08:55.266: Se0/1/0:0 LCP: O TERMACK [Open] id 38 len 4g al
*Apr 4 19:08:55.266: Se0/1/0:0 LCP: Event[Receive TermReq] State[Open to Stoppi
ng]
*Apr 4 19:08:55.266: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to up
*Apr 4 19:08:55.266: Se0/1/0:0 PPP: Outbound cdp packet dropped, line protocol
not up
*Apr 4 19:08:56.266: Se0/1/0:0 PPP: Outbound cdp packet dropped, line protocol
not up
*Apr 4 19:08:57.266: Se0/1/0:0 PPP: Outbound cdp packet dropped, line protocol
not up
*Apr 4 19:08:57.274: Se0/1/0:0 LCP: Event[Timeout-] State[Stopping to Stopped]
*Apr 4 19:08:57.274: Se0/1/0:0 LCP: Event[DOWN] State[Stopped to Starting]
*Apr 4 19:08:57.274: Se0/1/0:0 PPP: Phase is DOWNl
All possible debugging has been turned off
Router#
*Apr 4 19:08:57.278: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to down
Router#
Router#
Router#
Router#
Router#
*Apr 4 19:09:01.310: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to up
*Apr 4 19:09:03.326: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to down
*Apr 4 19:09:07.358: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to up
*Apr 4 19:09:09.374: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0:0, changed state to down

Best Regards

[Richard Burts]

Thanks for the debug output. It does show pretty clearly that there is some mismatch between the Cisco and the remote peer. There are several instances of messages like this

PPP DISC: Received LCP TERMREQ from peer

If I am understanding the message correctly the remote peer has requested termination of the connection. I am not familiar with Patton and wonder if they have some diagnostic similar to debug on Cisco. If so it might be helpful to see the output of the diagnostic tool on Patton when attempting to establish the connection.

I am concerned about this output that you provided from Patton

• PPPoE: Point-to-Point Protocol over Ethernet
• Frame Relay
• PPP: Point-to-Point Protocol over HDLC

On the Cisco it is attempting to utilize native PPP on the serial connection but it appears that Patton is doing PPP over HDLC. I am guessing that this mismatch is the source of your problem.

[Ahmed Abdulla Mohammed Sallam]

Good Morning Rick

Thanks for your detailed replay . when enabling PPP on CISCO using the command "encapsulation ppp" , Does this mean that i have support for encapsulation q921/q931on CISCO ?

Best Regards

[Georg Pauwen · Accepted solution]

Hello,

I recall that Cisco used to have its proprietary implementation of HDLC, so whatever HDLC the Patton router sends (PPP over HDLC in your case) will most likely not be compatible with Cisco. You might end up having to use Frame Relay, since that is apparently the only working option...

[Ahmed Abdulla Mohammed Sallam]

Good Morning Georg

Thx for your feedback and your notes.

Best Regards

[Richard Burts · Accepted solution]

Yes the Cisco implementation of ppp does support q921/q931. My guess is that the Patton implementation does not and that the ppp is not compatible between the 2 vendors. If Frame Relay was working then that is probably what you should use.

[Ahmed Abdulla Mohammed Sallam]

Good Morning Richard

Thx for your feedback and your advice.

Best Regards

[Richard Burts]

I am glad that our responses have been helpful. Thank you for marking this question as solved. This will help other participants in the community to identify discussions which have helpful information. This community is an excellent place to ask questions and to learn about networking. I hope to see you continue to be active in the community.

[Ahmed Abdulla Mohammed Sallam]

Good Afternoon Rick

Thanks for your message and your support in this case and i will do my very best to be an active member in this great community.

Best Regards