[mpls-linux-general] the question about the mplsd fail :(

[Folke A. <aeo...@ho...>]

hi, James,

  i analyzed the results of the
ethereal-analyzer. The outcome
is interesting.

  i did the same test for four times.

    +-------+1.1      +---------+2.1
  --+ cisco +---------+ linux 1 +---+
0.5+-------+      1.2+---------+   |
                                    |
                +---------+ 2.2     |
           -----+ linux 2 +---------+
             3.1+---------+

all tests' result are similar to
each other.
  i run the zebra and the mplsd
to setup lsp between the linux1
and the cisco. (i didn't run the
ospfd because i use the static
routing table) Then i run the
tcpblast to consume all the
bandwidth.
  the ethereal-analyzer shows
that , during the beginnig 10 to
20 seconds of the congestion,
there still had some keep-alive
messsages between the cisco and
the linux1. and there had ACK
packets from linux1 to cisco
but no ACK from cisco to linux1.
since the linux1 recieved no
ACK , it tried to re-send the
same keep-alive msg for one or
to times and then received the
notification msg from cisco
indicating the 'keep time out'
and 'shut down'. that seemed that
the cisco did not recieve the
ACK msg from the linux1 even
thought i catched it on the hub.
  now the strange things happened:
during my first test, the two
router tried to rebuild the tcp
session by first sent FIN and SYN
or even RST, and as soon as the
the tcpblast is stopped , the
LSP is restored.
but during my second test,
the cisco kept on sending the FIN
to linux1 and the with a respons
of ACK, and no LDP init msg is
catched.
now the third test:
  the mplsd collapsed. i did not
  find out when and what caused this.
the fourth test is even more strange:
  after the linux1 send the last LDP
keep-alive msg , no further things
happened, i mean, no tcp packets been
catched after that: no SYN , no RST,
no FIN , no ACK and no any LDP msg.
but the mplsd is still there.
i telnet to the mplsd vty and run
"configure termianltry" and
"interface eth0" and try to shutdown
the ldp by "no mpls ldp"
but the answer is "connection is closed
by foreign host". and the "ps -A" shows
no mplsd's signs.

  what's happened ?

by the way , i also noticed that
the keep-alive interval is always 15 sec
no matter what you by running the
keep-alive interval ...

  would you please help me out of this?

thanks in advance :)

folke.

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