How to configure BGP MED Attribute

Hi Rene

Does MED distributed to other routers within same AS? I have mpls cloud provided by Verizon, Verizon AS 65000,
my office1 in Houston AS 65400 has two routers, router1 and router2, each has a mpls connections to Verizon , router2 is backup and configure MED 10.
my office2 is in Sanfrancisco AS 65401. sometimes I have some unexplained network issue, connectivity from Sanfrancisco to Houston.
I wonder if MED is the issue not being distributed to all Verizon routers in the mpls cloud and cause asymmetric routing, I am thinking changing MED to AS Path Prepend on Houston router2.

thank you

Hoan