SE11 introduced better IPv6 Snooping:
Understanding a Cisco Internetwork Operating System (IOS) filename reveals its target hardware, capability tier, deployment style, and version lineage: c3560ipservicesk9mz1502se11bin
Switch# copy tftp://192.168.1.50/c3560-ipservicesk9-m.150-2.SE11.bin flash: Use code with caution. Step 4: Configure the Boot Variable SE11 introduced better IPv6 Snooping: Understanding a Cisco
You must tell the switch which file to load on reboot. (Contrast with c3750 for 3750 stacks)
| Component | Meaning | Technical Insight | | :--- | :--- | :--- | | | Platform Family | Indicates the image is for the Catalyst 3560 series. (Contrast with c3750 for 3750 stacks). | | 3560 | Specific Model | Compatible with 3560-24TS, 3560-48PS, 3560G, 3560E, and 3560V2 series. | | ipservices | Feature Set | Includes IP Routing (BGP, OSPF, EIGRP), Multicast (PIM), and IPv6. Not just "IP Base". | | k9 | Cryptography | Indicates 3DES/AES encryption support for SSH, SNMPv3, and secure management. | | mz | Memory Location | m = runs from RAM (not flash directly). z = ZIP compressed to save space. | | 150 | Major Release | IOS version 15.0. This is the final major release for the 3560. | | 2 | Maintenance Train | Second maintenance rebuild of the 15.0 branch. | | SE | Software/Encryption | Standard Edition for access switches. | | 11 | Rebuild Number | The 11th incremental rebuild of 15.0(2)SE. | | .bin | File Format | Binary executable. The switch loads this into RAM on boot. |
One Tuesday, at 3:14 AM, the "SE11" revision of the code felt a surge. A massive DDoS attack had hit the perimeter, and the overflow was trickling down to the distribution layer.