Conference 7.286::fddi

1362.0. "To detect a wrap conditon" by TKTVFS::NEMOTO (no facts, only interpretations) Sat Jun 04 1994 10:42

To answer a customer's request on network management, I'm looking for a way 
to detect, from a management station, a wrap conditon on a ring.  The FDDI mib 
has the followings, but I'm having trouble interpreting what it really means.

Can anyone help?  
Thanks,
_Tak

          fddimibSMTCFState OBJECT-TYPE
              SYNTAX  INTEGER {
                          cf0(1),   -- isolated
                          cf1(2),   -- local_a
                          cf2(3),   -- local_b
                          cf3(4),   -- local_ab
                          cf4(5),   -- local_s
                          cf5(6),   -- wrap_a
                          cf6(7),   -- wrap_b
                          cf7(8),   -- wrap_ab
                          cf8(9),   -- wrap_s
                          cf9(10),  -- c_wrap_a
                          cf10(11), -- c_wrap_b
                          cf11(12), -- c_wrap_s
                          cf12(13)  -- thru
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The attachment configuration for the station or
                      concentrator (refer to ANSI SMT 9.7.2.2)."
              REFERENCE
                      "ANSI { fddiSMT 42 }"
              ::= { fddimibSMTEntry 20 }

	The CFState is not enough to determine if the ring is wrapped.  The station must be on
	the truck ring.

	fddiSMTPeerWrapFlag uses the CFState and PC_Mode to determine if the station wraps the ring.

	Luc

Below is an excerption from ELAN MIB; concentrator part.
What does 'port down or up' really mean?  In other words, what failure
symptoms can cause a port 'down'?   


    esysFddiPortTrapSwitch OBJECT-TYPE
        SYNTAX  INTEGER {
                           true(1),
                           false(2)
                        }
        ACCESS  read-write
        STATUS  mandatory
        DESCRIPTION
               "This is a switch to enable or diable FDDI port up and port
               down traps.  When set to true, the concentrator will
               send a trap when one of its ports comes up or goes down."
        ::= { esysConcConfig 2 }

_Tak

	When PCM_State goes to ACTIVE that is a "port up" event.
	(You connect to another port)

	When PCM_State goes from ACTIVE to something else, that is a "port down" event.
	(You disconnect the port.)
	
	Luc

And yes, if you unplug the cable, the port will go down.

	paul

Luc, Paul, thanks.

Just out of curiosity, why is the peerwrapflag not defined as a trap?

_Tak