Walt Haas (
Fri, 27 Mar 87 14:20:58 MST

In article <>,
karn@FLASH.BELLCORE.COM (Phil R. Karn) writes:
> ... I understand that
> each GTE Telenet node speaks X.75 to its neighbors, making it an unlayered
> VC network. Because of this, a node or link failure ANYWHERE along the
> connection path causes an X.25 VC reset, not just failures at the end nodes.

Not entirely correct. The interface protocol X.25 is not affected if
an intermediate TCO fails, since the endpoint TCOs will reestablish the VC
(if possible) via an alternative route. The hosts will see a VC reset
only if one of the two endpoint TCOs fails. Tymnet does the same thing
by a similar mechanism.

Cheers -- Walt

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