[c-nsp] Routing design question

Gabor Ivanszky ivanszky at niif.hu
Tue Oct 2 06:01:30 EDT 2007


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Marian Ďurkovič wrote:
> On Thu, Sep 27, 2007 at 09:56:06AM +0200, Gert Doering wrote:
>> Will auto-neg signal one-way fiber failures (after the link has
>> already been brought up and autoneg'ed successfully)?  Never
>> tried that.
>
> Yes, it works much better (and faster) than UDLD. The endpoint
> which has lost receive fiber will immediately signal "RemoteFault"
> to the other end and line protocol will go down on both sides
> within miliseconds.
>

true, but if they have some active devices between the two sites(e.g.
an SDH/SONET transmission facility owned by the telco providing the GE
service), those active devices could fool the customer's GE interfaces
making them believe the connection is up and running, however the
circuit may or may not be operational.

regards,
Gabor
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