autonegotiation and media converters
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Posted by Manfred Kwiatkowski on August 25, 2005, 10:56 am
Please log in for more thread options mark.boolootian@gmail.com writes: >Manfred Kwiatkowski wrote:
>> As there is no autonegotiation defined on a 100BaseFX any possible
>> negotiation is local to the switch and its adjacent converter. >
>This is exactly my question. Jay's yielding to Murphy aside, if the >immediately adjacent converter is not autonegotiating, isn't it true >that the autonegotiation would then happen with the remote switch? >Autonegotiation consists of sending a 16-bit link code word >adverstising >capabilities. I'm assuming, and have some empirical evidence >confirming, >that if the adjacent converter isn't autonegotiating, it is going to >just pass the link code word on, making its way to the remote switch. > No. The code word cannot make it to the other side as there is no FLP defined on fiber. >One possible problem, which may have to do with Jay's observations,
>is that if the remote converter is set to autonegotiate, the remote >switch will be receiving link code words from the near switch *and* >the remote converter. Worse, the link code words sent by the remote >switch will be consumed by the remote converter, leaving the near >switch to assume the neighbor isn't autonegotiating (which ends up >being true). The autonegotiation is independent of the fiber side and soley a matter of the hardware configuration of the MC. There may be difficulties with link establishment (oszillations) due to "missing link" features and/or auto-mdix specially if the capaciators in the MC start to degrade. -- Manfred Kwiatkowski kwiatkowski@zrz.tu-berlin.de | |||||||||||||||||||||||||
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