Cisco Cisco IOS XE 3.5E

As 

 shows, each version of Cisco IOS XE has an associated Cisco IOS version:

If you are upgrading to IOS XE Version 3.7.0E and plan to use VSS, you must upgrade your ROMMON 
to IOS Version 15.0(1r)SG11.

ISSU is supported on 4500X in VSS configuration.

If dual supervisor engines are present, first upgrade your software to Cisco IOS XE 3.2.0SG or later, then 
upgrade your ROMMON to IOS Version 15.0(1r)SG7 to avoid an uplinks issue (CSCtj54375).

The maximum MTE supported on Catalyst 4500 switches is 8000, per direction.

Although the show memory command is supported on Catalyst 4500 series switches, the CLI output 
for the command shows the value 0 for the config total, on Catalyst 4500 series switches using a 
daughter card on Supervisor Engine 7-E. This issue is, however, not seen on switches with 
Supervisor Engine 7-E baseboard. (CSCup28930)

PBR IPv6 on 
Supervisor Engine 
8-E

Support for Policy-Based Routing on IPv6 traffic on Supervisor Engine 8-E.

VRF-aware PBR

Support for Policy-Based Routing, on IPv4 and IPv6 traffic, on multiple virtual routing 
instances.

VSS: Layer 2 
Protocol Tunneling, 
VLAN Translation, 
and Q-in-Q 

Support for Dot1q Tunnel (“legacy/classic” dot1q tunnel), Dot1q tunneling and L2PT 
(Layer 2 Protocol Tunneling), and VLAN Translation (1:1 and 1:2-Selective QinQ).

03.3.0SG

15.1(1)SG

03.3.1SG

15.1(1)SG1

03.4.0SG

15.1(2)SG

03.5.0E

15.2(1)E

03.6.0E

15.2(2)E

03.7.0E

15.2(3)E