[c-nsp] Multilink PPP IPCP Negotiation Problem

[Douglas E. Warner]

I'm trying to setup MLPPP between two 7505's running RSP4s on 12.4(3) over 
4xT1 on PA-MC-8T1 cards.  The problem I'm having is that the Multilink 
interface gets stuck in IPCP trying to agree on IPs, even though I have the 
Multilink interface configured with the IP on both ends.

Unfortunately, my log server ate the debugs from my one router, but they were 
still in the buffer on the other.  To me, it looks like rtr0.tc sends a 
CONFREQ to rtr0.mbrg saying "I have this IP"; rtr0.mbrg then acknowledges, 
but it looks like rtr0.tc never receives it.

Below is a snippet of the logs from rtr0.mbrg:

---------------------------------
Aug 24 19:13:07: Mu1 IPCP: O CONFREQ [ACKsent] id 8 len 10
Aug 24 19:13:07: Mu1 IPCP:    Address 172.16.5.18 (0x0306AC100512)
Aug 24 19:13:09: Mu1 IPCP: I CONFREQ [ACKsent] id 9 len 10
Aug 24 19:13:09: Mu1 IPCP:    Address 172.16.5.17 (0x0306AC100511)
Aug 24 19:13:09: Mu1 IPCP: O CONFACK [ACKsent] id 9 len 10
Aug 24 19:13:09: Mu1 IPCP:    Address 172.16.5.17 (0x0306AC100511)
Aug 24 19:13:09: Mu1 IPCP: TIMEout: State ACKsent
Aug 24 19:13:09: Mu1 IPCP: O CONFREQ [ACKsent] id 9 len 10
Aug 24 19:13:09: Mu1 IPCP:    Address 172.16.5.18 (0x0306AC100512)
Aug 24 19:13:11: Mu1 IPCP: I CONFREQ [ACKsent] id 10 len 10
Aug 24 19:13:11: Mu1 IPCP:    Address 172.16.5.17 (0x0306AC100511)
Aug 24 19:13:11: Mu1 IPCP: O CONFACK [ACKsent] id 10 len 10
Aug 24 19:13:11: Mu1 IPCP:    Address 172.16.5.17 (0x0306AC100511)
Aug 24 19:13:11: Mu1 IPCP: TIMEout: State ACKsent
Aug 24 19:13:11: Mu1 IPCP: O CONFREQ [ACKsent] id 10 len 10
Aug 24 19:13:11: Mu1 IPCP:    Address 172.16.5.18 (0x0306AC100512)
Aug 24 19:13:13: Mu1 IPCP: TIMEout: State ACKsent
Aug 24 19:13:13: Mu1 IPCP: State is ACKsent
---------------------------------

Has anyone seen this behavior before?

-Doug

-- 
Douglas E. Warner    <dwarner at ctinetworks.com>     Network Engineer
CTI Networks, Inc.   http://www.ctinetworks.com    +1 717 975 9000
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