![cisco devices running vstack asr1001x cisco devices running vstack asr1001x](http://i.ytimg.com/vi/DZ0JouH0VDQ/hqdefault.jpg)
ISR 4000s are running IOS-XE and have introduced performance-based licensing with 3 tiers: ISR G2 Recommended Sizing Based on WAN Link Speed ISR 4000 It is also expected that the router will not be running at 99% CPU and will be dropping packets. Values are much smaller compared to normal IP forwarding.
Cisco devices running vstack asr1001x download#
For example, in the case of 10Mbps WAN with expected 9Mbps download and 3Mbps upload – calculation should be based on 12Mbps of the load.įor G2 platforms Cisco recommended WAN-link based sizing is as per the table below. On the other hand, to select a router for a specific WAN interface bandwidth utilization in each direction must be added. Cisco counts this is as a single packet, as it is seen by the forwarding engine. The real-world number will be significantly smaller.Īnother important thing to note is how a packet is counted, for example, it can be counted twice – as it enters an ingress interface and exits egress one. Values provided in Table 1 are based only on IP packet routing without any additional processing, such as QoS, encryption, or NAT, so it is a maximum performance that a platform can deliver. The average packet size in this case will be 340 bytes. For example, in a simple IMIX sample in every 12 packets transmitted – 7 will be 40 bytes long, 4 – 576, and 1 – 1500. What is IMIX? The traffic doesn’t consist of packets of the same size, many tests are using packets of different sizes (called Internet Mix (IMIX)). As the results can differ more than 20x times based on the size of the packets selected, the specification must provide average packet size that was used during the test. packet size in bytes x packets per second). The third column displays the value in bytes per second (i.e. So it is usually a more reliable metric that removes packet size from the equation. For a router’s CPU it takes the same amount of effort to route the 64-byte packet as it would take for 1500-byte one.
![cisco devices running vstack asr1001x cisco devices running vstack asr1001x](https://info.pivitglobal.com/hs-fs/hubfs/Cisco%20ASR%20Model%20picture.png)
The second column displays the number of packets per second that the platform can forward under maximum CPU utilization just before starting to drop the packets. Important: These are not real-world numbers.