I have two 7513 router with IOS 12.1(14) GD Enterprise. Fa0/0/2 is crossed while Fa0/0/1 is ISL trunk to two switches.
The trunk port Fa0/0/1 have multiple sub-interfaces configured in HSRP. If I change one of the 7513 with 3845 installed with Advanced Enterprise Service 12.4(?), will the HSRP/ISL trunk still work?