[j-nsp] Changing advertised BGP metric based on condition

[Kevin Wormington]

Hi All,

I'm fairly new to JunOS running 9.6 on M7i gear.  I have two M7i's that 
are each connected to one particular peer (same AS) that doesn't support 
BFD for BGP or BFD for routes and the links also go through an 
intermediate layer 2 switch (not ours; on the upstream side) so a fast 
failover doesn't work, ie. you are looking at hold-time on a failure. 
The M7i's are also connected to each other of course via IBGP and OSPF.

I am wondering if it's possible that upon detection of a link 
failure/BGP failure on one M7i to have the other M7i be able to change 
the metric on the routes it's advertising to that particular upstream to 
cause their network to prefer the route that is up?

I think something like this could be done with an event script, but I 
thought I would ask the experts to see if there is something easier that 
I'm overlooking?

Thanks,

Kevin