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Community Member

LCP timeout problem

I got PPP LCP timeout problem with ISDN connection. Line was drop every 20 sec. I already try to change speed already.(56k , 64k). Only saw Open confreq message(BR0/0:1 LCP: O CONFREQ [Closed] id 113 len 32)  not reply from other side. Pls advice me for this problem.

Thanks

4 REPLIES
Cisco Employee

Re: LCP timeout problem

Could be many things.  Is the other side running PPP?  Does the Q.931 call complete?  Is it the right call type (e.g., data, not voice)?  Ar ethe ISDN ports properly provisioned at both sides?  Ar ethe two ISDN lines on the same carrier?

Debug isdn Q931 on both sides may be illustrative.

Community Member

Re: LCP timeout problem

Thank you Philip. Q931 was successful.But not from same ISDN carrier. It is happen as same as mention in https://supportforums.cisco.com/post!reply.jspa?message=3219791. But I already try to change speed but not working. Any suggestion, pls .

*Mar 14 01:49:10.160: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up
! -- Call is connected. PPP negotiation will begin
*Mar 14 01:49:10.168: %DIALER-6-BIND: Interface BR0:1 bound to profile Di1.
*Mar 14 01:49:10.188: BR0:1 PPP: Treating connection as a callout
*Mar 14 01:49:10.188: BR0:1 PPP: Phase is ESTABLISHING, Active Open [0 sess, 0 load] ! -- PPP negotiation begins
*Mar 14 01:49:10.196: BR0:1 LCP: O CONFREQ [Closed] id 24 len 15
*Mar 14 01:49:10.200: BR0:1 LCP:    AuthProto CHAP (0x0305C22305)
*Mar 14 01:49:10.204: BR0:1 LCP:    MagicNumber 0x545D708A (0x0506545D708A). ! -- Outgoing Configure-Request (CONFREQ)
*Mar 14 01:49:12.176: BR0:1 LCP: TIMEout: State REQsent ! -- Router has not received a CONFREQ from the peer, hence the timeout
*Mar 14 01:49:12.180: BR0:1 LCP: O CONFREQ [REQsent] id 25 len 15
*Mar 14 01:49:12.184: BR0:1 LCP:    AuthProto CHAP (0x0305C22305)
*Mar 14 01:49:12.188: BR0:1 LCP:    MagicNumber 0x545D708A (0x0506545D708A).
*Mar 14 01:49:14.160: BR0:1 LCP: TIMEout: State REQsent
*Mar 14 01:49:14.164: BR0:1 LCP: O CONFREQ [REQsent] id 26 len 15
*Mar 14 01:49:14.168: BR0:1 LCP:    AuthProto CHAP (0x0305C22305)
*Mar 14 01:49:14.172: BR0:1 LCP:    MagicNumber 0x545D708A (0x0506545D708A)

Cisco Employee

Re: LCP timeout problem

Seems like the answering side is not set for PPP (or fconfigured incorrectly), or the remote switch interpreting the call incorrectly (for example, as a Voice or V.120 call).

Who is the ISDN carrier?  Is this call limited to one carrier or crassing international and/or carrier boundaries?

Community Member

Re: LCP timeout problem

Sorry for my late response. I am waiting fro Telco response. It still can

not fix. It happen between two ISP at China. Can some one

confirm LCP timout is related to ISP or others? At LCP Negotation phase, see only outbound LCP CONFREQ messages

O CONFREQ [Closed] id 24 len 15

Never saw in bound message.
I CONFREQ [ACKrcvd] id 137 len 14. I checked already for ppp commands. 
It is in place and also this router calling to another place is working fine.
Only happen to one location.

Thank you for your suggestion.

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