[c-nsp] necessity of nowadays

Saku Ytti saku at ytti.fi
Wed Mar 23 07:53:00 EDT 2016

On 23 March 2016 at 13:20, Sebastian Beutel
<sebastian.beutel at rus.uni-stuttgart.de> wrote:

>     That's why i am asking myself whether udld is a residue that nowadays
> causes more harm than it prevents and should therefore not be used anymore.
> At least on gigabit and faster links and if there are no really dumb
> media converters involved.
> What do you think?

I couldn't agree more, as long as you have hardware liveliness
detection and unidirectional link detection like you have on Ethernet,
UDLD will just decrease your availability not increase. As it's
control-plane feature and on timely transport of BPDU.
Ethernet has RFI or remote-fault-indicator, it can assert when it sees
line down, then on unidirectional link far end will get this RFI and
go down also.


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