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upgrade cat4500



we're having some troubles connecting a cisco nexus5548 to a cat4500 via a lacp etherchannel. in a test with another switch the channel to the nexus worked at the first try. so we're thinking of an software problem (we also tried different transceivers on the 4500 of course). to resolve the problem i want to upgrade from the current

Cisco IOS Software, Catalyst 4000 L3 Switch Software (cat4000-I9S-M), Version 12.2(25)EWA12, RELEASE SOFTWARE (fc1)

ROM: 12.1(20r)EW1

cisco WS-C4507R (MPC8245) processor (revision 7) with 524288K bytes of memory.

to the latest IOS version 15.0(2)SG. All the modules are listed under "supported hardware":

Mod Ports Card Type Model Serial No.


1 2 Supervisor IV 1000BaseX (GBIC) WS-X4515

2 2 Supervisor IV 1000BaseX (GBIC) WS-X4515

4 18 1000BaseX (GBIC) WS-X4418-GB

5 6 SFP, 10/100/1000BaseT (RJ45)V, Cisco/I WS-X4506-GB-T

7 48 10/100/1000BaseT (RJ45) WS-X4448-GB-RJ45

Mod Redundancy role Redundancy mode Redundancy status


1 Standby Supervisor RPR Standby cold

2 Active Supervisor RPR Active

my questions:

  • Is it possible to upgrade from 12.2(25) to 15.0(2)SG or is it better to upgrade to 12.231-SGA11 (what does the "SG" or "EWA" stand for??)
  • Which of the 6 images do i have to take (enterprise, IP base etc) ?
  • Does upgrading the "standby" hsrp router have any impact on the "active" hsrp router?