I need to upgrade from 5.1 to 5.1(3b) due to an issue with disk space on the active partition - I am down to 2% free space. This is a bug I guess - seem to get different answers from TAC.
Anyway my question is this. I have multiple sites running off of a single cluster at my HQ. The connections to remote sites is MPLS (1.5mbs). There are 3 remote sites - about 300 phones remote. WHen I do the upgrade I upgrade the Publisher first, then the Subscriber. So when the Subscriber upgrades - I assume the phones register with the Publisher and will that cause all the phones to do a phone load upgrade. My conscern is what happens if multiple phones are trying to get to the TFTP server for new downloads at the same time over the WAN. Is this an issue??