Re: DOWN state

[Dave Katz <dkatz at juniper.net>]

On Aug 14, 2009, at 4:49 PM, Shahram Davari wrote:

Hi,

 

The based draft sys that if BFD Control packet is not received during any Detection Interval then the local system will go to Down state.

I have two questions:

 

1) When can the local system transition out of Down state? Is it after receiving the first BFD packet with State=DOWN or INIT? or a number of such BFD packets are required? in other words is there a Hysteresis?

The state machine should be clear on this (first received packet.)

 

2) Should the remote system apply  a sliding window for Detection Time or fixed slotted windows that are not overlapped are acceptable?

This is an implementation issue outside of the spec.  There is no interoperability issue with slow timers;  it just means that it takes a bit longer for the local system to realize that things have gone bad.

--Dave