[j-nsp] Juniper M40e - Junos 8.3 - coc12

[Judd, Michael (Michael)]

BACKGROUND:

I am working with a customer who is using MLPPP. Whenever the directly
connected DACS experiences any sort of redunancy switchover, separate
from an APS switchover, a path AIS is generated which causes the M40's
ct3's to bounce. When this happens, all MLPPP re-negotiation/restart
occurs resulting in higher than desired recovery times for the network
that this service is serving.  I found the following parameter in the
Juniper docs but have no easy way to test this in the lab. 
Cisco has a similar feature called carrier-delay.

Question; does anyone have any experience or insight into the following
interfaces hold-time parameter?
 
http://www.juniper.net/techpubs/software/junos/junos76/swconfig76-networ
k-interfaces/html/interfaces-physical-config31.html
 
Damping Interface Transitions 

By default, when an interface changes from being up to being down, or
from down to up, this transition is advertised immediately to the
hardware and the JUNOS software. In some situations-for example, when an
interface is connected to an add-drop multiplexer (ADM) or
wavelength-division multiplexer (WDM), or to protect against SONET/SDH
framer holes-you might want to damp interface transitions. This means
not advertising the interface's transition until a certain period of
time has passed, called the hold-time. When you have damped interface
transitions and the interface goes from up to down, the interface is not
advertised to the rest of the system as being down until it has remained
down for the hold-time period. Similarly when an interface goes from
down to up, it is not advertised as being up until it has remained up
for the hold-time period. 

To damp interface transitions, include the hold-time statement at the
[edit interfaces interface-name] hierarchy level:

[edit interfaces interface-name] 

hold-time
<http://www.juniper.net/techpubs/software/junos/junos76/swconfig76-netwo
rk-interfaces/html/interfaces-summary143.html#1015655>  up milliseconds
down milliseconds; 

The time can be a value from 0 through 65,534 milliseconds. The default
value is 0, which means that interface transitions are not damped. The
JUNOS software advertises the transition within 100 milliseconds of the
time value you specify.
Thank you !
 
 
 
~~~~~~~~~~~~~~~
Mike Judd
Member of Technical Staff
Alcatel-Lucent
4 Robbins Road
Westford, MA 01886
office: 978-392-6406
 
Alcatel-Lucent Global TSS Contact Center
** 24x7x365 Customer Technical Support **
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Outside of the United States 1-630-224-4672
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