How many different hsrp groups do you have defined ? Each model has a limit of how many different hsrp groups can be defined . Also you do not have to have a different hsrp group number for each hsrp instance .
Regardless of the HSRP group numbers used the 3750 has a platform limitation of 32 HSRP instances (same for 3560). I hit this a while ago and I thought it was a backwards step as the 3550 it replaces didn't have the same limitation.
I would however question why you are using a 3750 as a 'Core' and have 48 VLANs you want to terminate the Layer-3 SVI's on? It might be worth explaining your topology as there could be other options. Layer-3 to the edge is something that is now quite common and removes the need for terminating lots of SVI's on distribution (or small/collapsed core?) switches.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
The need was to reach an host inside a LAN through a VPN connection managed by the LAN gateway (Cisco 1921).
The LAN gateway performs NAT and there was a dedicate nat rule for the host i wanted to reach through VPN.
I couldn't connect to the hos...