The MPLS WG Archive

[Arthi Ayyangar <ayyangar@apollo.mctr.umbc.edu>]

Hi,

> When Hellos are being exchanged between neighbors, what happens to
> normal refreshes?  Do they continue as before?  If so, then what's the
> point to using Hello at all?
***> Normal Path and Resv refreshes do continue as before. The point of
using Hello is to detect a node  failure so that a neighboring RSVP node
can react to that fialure quickly. In the absence of this, a node needs to
wait till the soft state times out to detect a failure.

Hello was never meant to supress normal refreshes if that's wht you are u
mean.


> If the refresh interval is increased (perhaps to days), then what
> mechanism is used to handle the possibility of a tear message that gets
> lost?
****> If the loss is because of a node/link failure, using Hellos (which
are sent frequently) a node will detect the failure quickly and decalre a
neighbor to be down.
(If a PathTear is getting lost, I assume so is a Path)

-arthi