When an NE20E-S16 is interconnected to a third-party device through MP-group,
an E1 interface is physical Up but experiences protocol Down.
current state : UP (ifindex: 61)
current state : DOWN
Maximum Transmit Unit is 1500, Hold timer is 10(sec)
E1 0/2/0, Unframed mode, baudrate is 2048000 bps
protocol processing : disabled
protocol is PPP
1. Check that parameters, such as the CRC and framed mode, on both ends
2. Establish a link loop and perform a test. The test result shows that
devices on both ends can detect the loop and the link functions properly.
3. Check that the interfaces added by MP-group are also correct. It is
suspected that PPP negotiation does not work properly. Run the debugging ppp all command. The command
output includes the following error information:
Aug 29 2018
17:04:17.592 huawei %%01PPP/6/PPP_Debug(d):VS=Admin-VS-CID=0x807c04d2;PPP Dbg:
Protocol<LCP>, FsmState<acksend>, ErrInfo:<[Mp]
because The discri Not Same.>//The negotiation fails because the received identifier
is inconsistent with that of the member interface.
the following command and check that the identifier of Serial 0/2/0:0 is 6296429530947087967:
disp inner-data ppp cid 807C04D2 info-type pppnegoinfo 61 lcp his
App Cid: 0x807c04d2
4. Check that the identifier sent by the third-party device is incorrect.
The identifier sent by the third-party device is incorrect.
1. Run the shutdown and then
the undo shutdown commands on the
two member interfaces of the MG-group interface to trigger re-negotiation.
2. Disable the terminal identifier negotiation function on devices at both
ends. The configuration also takes effect after the shutdown and undo shutdown commands
To disable identifier negotiation for NE devices, run the following
interface mp-group 1/0/1
If the undo discriminator command is run on
the MP-group interface, the shutdown command and then the undo shutdown command
must be run on the sub-channels of the MP-group to make the preceding
configuration take effect.