[j-nsp] PPP Negotiation Issues

[Jason Iannone]

All,

I'm having trouble understanding a PPP Negotation issue with a single
T1 on a Multilink interface.  The Juniper appears to be rejecting an
LCP configuration option including a MAC address received from an
Adtran.  I haven't been able to find a reference in RFC 1661
indicating that "End-Disc" is a valid option.  This is the second time
we've seen this issue and I'm not sure if I'm digressing from the real
issue or if I should continue to pursue this.

The following debugs were from the same ~20 second period.  The Adtran
never indicates that it has received an LCP message, while the Juniper
both transmits and receives.  In the interest of brevity, I have
removed all but two cycles of configure reject messages from the
Juniper monitor traffic interface detail output.


Adtran PPP debug:

2009.04.24 17:40:08 PPP.NEGOTIATION PPPtx[t1 1/1] LCP: Conf-Req
ID=152 Len=23 MAGIC(027e2bf2) MRRU(1520) ED(3:00a0c84068c2)
2009.04.24 17:40:12 PPP.NEGOTIATION PPPtx[t1 1/1] LCP: Conf-Req
ID=153 Len=23 MAGIC(027e2bf2) MRRU(1520) ED(3:00a0c84068c2)
2009.04.24 17:40:16 PPP.NEGOTIATION PPPtx[t1 1/1] LCP: Conf-Req
ID=154 Len=23 MAGIC(027e2bf2) MRRU(1520) ED(3:00a0c84068c2)
2009.04.24 17:40:20 PPP.NEGOTIATION PPPtx[t1 1/1] LCP: Conf-Req
ID=155 Len=23 MAGIC(027e2bf2) MRRU(1520) ED(3:00a0c84068c2)
2009.04.24 17:40:24 PPP.NEGOTIATION PPPtx[t1 1/1] LCP: Conf-Req
ID=156 Len=23 MAGIC(027e2bf2) MRRU(1520) ED(3:00a0c84068c2)
2009.04.24 17:40:28 PPP.NEGOTIATION PPPtx[t1 1/1] LCP: Conf-Req
ID=157 Len=23 MAGIC(027e2bf2) MRRU(1520) ED(3:00a0c84068c2)
2009.04.24 17:40:32 PPP.NEGOTIATION PPPtx[t1 1/1] LCP: Conf-Req
ID=158 Len=23 MAGIC(7bb2b1cf) MRRU(1520) ED(3:00a0c84068c2)
2009.04.24 17:40:32 PPP.NEGOTIATION PPPtx[t1 1/1] LCP: Conf-Req
ID=159 Len=23 MAGIC(7bb2b1cf) MRRU(1520) ED(3:00a0c84068c2)

---

Juniper debug:

17:40:08.685156  In LCP, Conf-Request (0x01), id 152, length 25
        encoded length 23 (=Option(s) length 19)
          Magic-Num Option (0x05), length 6: 0x027e2bf2
          MRRU Option (0x11), length 4: 1520
          End-Disc Option (0x13), length 9: MAC 00:a0:c8:40:68:c2
17:40:08.685294 Out LCP, Conf-Reject (0x04), id 152, length 15
        encoded length 13 (=Option(s) length 9)
          End-Disc Option (0x13), length 9: MAC 00:a0:c8:40:68:c2
17:40:11.382693 Out LCP, Conf-Request (0x01), id 53, length 27
        encoded length 25 (=Option(s) length 21)
          MRU Option (0x01), length 4: 1514
          Magic-Num Option (0x05), length 6: 0x49fc248a
          MRRU Option (0x11), length 4: 1504
          End-Disc Option (0x13), length 7: IPv4 64.129.252.137
17:40:12.684943  In LCP, Conf-Request (0x01), id 153, length 25
        encoded length 23 (=Option(s) length 19)
          Magic-Num Option (0x05), length 6: 0x027e2bf2
          MRRU Option (0x11), length 4: 1520
          End-Disc Option (0x13), length 9: MAC 00:a0:c8:40:68:c2
17:40:12.685070 Out LCP, Conf-Reject (0x04), id 153, length 15
        encoded length 13 (=Option(s) length 9)
          End-Disc Option (0x13), length 9: MAC 00:a0:c8:40:68:c2




Thanks for your time,

Jason