ISR大致可以分幾類：
Cisco 860、880、890
ISR1800 (fixed)、1800 (modular)、2800、3800 Series
ISR1900、2900、3800、3900 Series
ISR4K
每一代的設備，設備的性能肯定都不一樣，本摘要，將主要記錄ISR的吞吐性能問題。
1、下圖主要體現的是800 Series和1900、2900、3900 Series，廠商建議的WAN最大throughput，該建議應適合大多數企業和商業客戶：
Table 2. Cisco ISR G2 key benfits over the ISR G1
該參數，基本也可以從Datasheet中查詢得到，如1900和2900：
Table 1. Key Features and Benefits of the Cisco 1921 Integrated Services Router
| High performance with integrated services |
● The Cisco 1900 Series enables deployment in high-speed WAN environments with concurrent services enabled up to 15 Mbps.
|
Table 1. Key Features and Benefits of the Cisco 1941 Integrated Services Router Series
| High Performance with Integrated Services |
● The Cisco 1900 Series enables deployment in high speed WAN environments with concurrent services enabled up to 25 Mbps.
● Multi-Gigabit Fabric enables high bandwidth module to module communication without compromising routing performance.
|
Table 1. Key Business Benefits of the Cisco 2900 Series Integrated Services Routers
| High Performance with Integrated Services |
● The Cisco 2900 Series enables deployment in high speed WAN environments with concurrent services enabled up to 75 Mbps.
● A MultigiGabit Fabric (MGF) enables high-bandwidth module-to-module communication without compromising routing performance.
|
2、下圖主要針對ISR4K的WAN throughput：
三種性能級別：
| Platform | Factory Default | Performance License | Boost License |
| 4451 | 1Gbps | 2 Gbps @ 19% CPU | 4 Gbps* @ 35% CPU |
| 4431 | 500Mbps | 1 Gbps @ 18% CPU | 4 Gbps* @ 62% CPU |
| 4351 | 200Mbps | 400 Mbps @ 17% CPU | 2 Gbps* @ 45% CPU |
| 4331 | 100Mbps | 300 Mbps @ 16% CPU | 2 Gbps* @ 53% CPU |
| 4321 | 50Mbps | 100 Mbps @ 8% CPU | 2 Gbps* @ 68% CPU |
| 4221 | 35Mbps | 75 Mbps @ 8% CPU | 1.4 Gbps @ 94% CPU |
Datasheet中也有記錄：
Table 4. Specifications of Cisco 4000 Family Integrated Services Routers
| Technical Specifications |
Cisco 4461 |
Cisco 4451 |
Cisco 4431 |
Cisco 4351 |
Cisco 4331 |
Cisco 4321 |
Cisco 4221 |
| Aggregate Throughput (Default) |
1.5Gbps |
1 Gbps |
500 Mbps |
200 Mbps |
100 Mbps |
50 Mbps |
35Mbps |
| Aggregate Throughput (Performance License) |
3Gbps |
2 Gbps |
1 Gbps |
400 Mbps |
300 Mbps |
100 Mbps |
75 Mbps |
| Aggregate CEF Only[5] Throughput (Boost License) |
Over 7Gbps |
Over 4Gbps |
Over 4Gbps |
Over 2Gbps |
Over 2Gbps |
1.5Gbps |
1.2Gbps |
如果需要提升throughput，對license的需求如下：
Table 6. Cisco ISR 4000 Performance Licenses
| Platform |
Performance-on-Demand License |
Features |
| ISR4461 |
FL-4460-PERF-K9 |
Increases the performance from base performance 1.5 Gbps to 3 Gbps |
| ISR4451 |
FL-44-PERF-K9 |
Increases the performance from base performance 1 Gbps to 2 Gbps |
| ISR4431 |
FL-44-PERF-K9 |
Increases the performance from base performance 500 Mbps to 1 Gbps |
| ISR4351 |
FL-4350-PERF-K9 |
Increases the performance from base performance 200 Mbps to 400 Mbps |
| ISR4331 |
FL-4330-PERF-K9 |
Increases the performance from base performance 100 Mbps to 300 Mbps |
| ISR4321 |
FL-4320-PERF-K9 |
Increases the performance from base performance 50 Mbps to 100 Mbps |
| ISR4221 |
FL-4220-PERF-K9 |
Increases the performance from base performance 35 Mbps to 75 Mbps |
Table 7. Cisco ISR 4000 Booster (boost) Performance Licenses
| Part number |
Description |
| FL-4220-BOOST-K9 (=) |
Booster Performance License for 4220 Series Router |
| FL-4320-BOOST-K9 (=) |
Booster Performance License for 4320 Series Router |
| FL-4330-BOOST-K9 (=) |
Booster Performance License for 4330 Series Router |
| FL-4350-BOOST-K9 (=) |
Booster Performance License for 4350 Series Router |
| FL-4430-BOOST-K9 (=) |
Booster Performance License for 4430 Series Router |
| FL-44-BOOST-K9 (=) |
Booster Performance License for 4450 Series Router |
| FL-4460-BOOST-K9 (=) |
Booster Performance License for 4460 Series Router |