[nsp] Basic transmission test question (how interface know it's looped?)

From: Yu Ning (yuning@ns.chinanet.cn.net)
Date: Fri Sep 29 2000 - 12:44:20 EDT


Hi All,

Can anyone tell me why sometimes when we physically loop a circuit, we can see a
"loop" state from the show interface command. But sometimes when we loop a line,
we can only see both the interface and line protocol is "up", but not the word
"loop". In what condition, interface will detect it been looped?

Our current no "loop" hardware is:

SLOT 3 (RP/LC 3 ): 4 port ATM Over SONET OC-3c/STM-1 Multi Mode
  MAIN: type 39, 800-4104-01 rev A0 dev 16777215
        HW config: 0x01 SW key: FF-FF-FF
  PCA: 73-3034-02 rev A0 ver 2
        HW version 1.1 S/N CAB0240A9EC
  MBUS: MBUS Agent (1) 73-2146-07 rev B0 dev 0
        HW version 1.2 S/N CAB0236A4Z8
        Test hist: 0xFF RMA#: FF-FF-FF RMA hist: 0xFF
  DIAG: Test count: 0xFFFFFFFF Test results: 0xFFFFFFFF
  L3 Engine: 0 - OC12 (622 Mbps)
  MBUS Agent Software version 01.40 (RAM) (ROM version is 01.33)
  Using CAN Bus A
  ROM Monitor version 10.00
  Fabric Downloader version used 13.01 (ROM version is 13.01)
  Primary clock is CSC 1
  Board is analyzed
  Board State is Line Card Enabled (IOS RUN )
  Insertion time: 00:00:11 (8w0d ago)
  DRAM size: 268435456 bytes
  FrFab SDRAM size: 67108864 bytes
  ToFab SDRAM size: 67108864 bytes
  0 crashes since restart

We just connect the input with output via fiber.


regards,


------------------------------------------
(Mr.) Yu(2) Ning(2)
Support,Int'l/Domestic Routing
ChinaNET(AS4134) Backbone Operation
Beijing,P.R.C. +86-10-66418105/8121/8122
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