[CentOS] delay in establishing network connectivity

[Steven Tardy]

> On Oct 17, 2017, at 5:07 PM, FHDATA <fhdata at unm.edu> wrote:
> 
> can not establish a network connectivity
> for some time: 7 to 15 minutes and then
> everything network wise is fine...

Over 5 minutes makes it sound like a ARP time-out somewhere(default gateway).
Does ifconfig show the interface as “UP”?
Does tcpdump show any packets coming in(background broadcast noise at least) or going out?
What does the upstream switch show?
Is spanning-tree blocking/listening/learning on the upstream switch?
Can arping get a response from the IP?
Does the upstream switch show that MAC address is learned on the right switch port?
Are you trying to use bonding/teaming as something could be waiting for LACP packets?