We are using EIGRP to propagate routes thru VTI with IPSEC from our HQ to our branches, using 3 provider. On one of the link, the EIGRP is often down and comes up right away ( flapping ? ) thus making our link unstable and slow. we are using a same configuration for each provider/link. is the issue come from the provider or our configuration ? should we change our EIGRP hello/holdtime from the default to 60/180 ? ( our link is 256 ) , or is there any particular thing we could do to assess this problem further ?