Our team will upgrade two MX480(dual RE) on Virtual Chassis from 13.3R4.6 to 15.1F4.15 , can you advise about the most optimized or recommended upgrade path? Can the upgrade be directly from this version without issue or do we need to do an intermediate upgrade before?
The main objetive of this upgrade is to support a new mpc7 and the requeriment is to upgrade to this version.
As the geneal rule, you can upgrade two major versions (13 to 15) if you are running the Extended EOL version as the current one. 13.3 is the EEOL version so you are good from that perspective.
The next step is to review the release notes for your upgrade version 15.1. These I don't see yet in my download account. So you will need to get a copy of those and review the upgrade section for all the known issues in the upgrade path.
Steve Puluka BSEET - Juniper Ambassador IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP) http://puluka.com/home