| ASA 5505 | ASA 5510 | ASA 5520 | ASA 5540 | ASA 5550 | Catalyst 6500 FWSM | |
|---|---|---|---|---|---|---|
| Operating System | ASA 7.x, 8.x | ASA 7.x, 8.x | ASA 7.x, 8.x | ASA 7.x, 8.x | ASA 7.x, 8.x | FWSM 2.x, 3.x |
| Memory | 256 MB | 256 MB | 512 MB | 1 GB | 4 GB | 1 GB |
| Flash (minimum) | 64 MB | 64 MB | 64 MB | 64 MB | 64 GB | 128 MB |
| Throughput | 150 Mbps | 300 Mbps | 450 Mbps | 650 Mbps | 1.2 Gbps | 5 Gbps |
| Concurrent Connections | 10,000/25,000[1] | 50,000/130,000[1] | 280,000 | 400,000 | 600,000 | 1 million |
| Physical Interfaces | Eight 10/100 switch; two Power over Ethernet (PoE) | Five 10/100 | Four 10/100/1000, one 10/100 | Four 10/100/1000, one 10/100 | Eight 10/100 plus 12 10/100 or nine GigabitEthernet | 0 |
| Logical Interfaces | Three (no trunking)/20 (trunking) | 50/100[1] | 150 | 200 | 250 | 100 |
| Failover | No / Stateless Active/Standby (A/S)[1] | No / Active/Active (A/A) and A/S | A/A and A/S | A/A and A/S | A/A and A/S | A/A and A/S[2] |
| AAA and Cut-Through Proxy | Yes | Yes | Yes | Yes | Yes | Yes |
| Command-Line Interface | Console, Telnet, Secure Shell (SSH) | Console, Telnet, SSH | Console, Telnet, SSH | Console, Telnet, SSH | Console, Telnet, SSH | Telnet, SSH |
| GUI | ASDM | ASDM | ASDM | ASDM | ASDM | ASDM |
| Routing | Static, RIP, EIGRP, OSPF | Static, RIP, EIGRP, OSPF | Static, RIP, EIGRP, OSPF | Static, RIP, EIGRP, OSPF | Static, RIP, EIGRP, OSPF | Static, RIP, OSPF |
| Security Contexts | 0 | 0 / 2, 5[1] | 2, 20 | 2, 50 | 2, 50 | 100 |
| VPN-Capable | Yes | Yes | Yes | Yes | Yes | No[3] |
[1] Base license/Security Plus license
[2] The FWSM supports only LAN-based failover, because it has no physical failover cable connector.
[3] The FWSM does not support any IPSec VPN features except for a 3DES tunnel that is used for management purposes.
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