# Relationship of Bandwidth and Packet Per Second (PPS) Explanation (Cisco Router Performance)

I'm currently searching the performance of a Cisco router model ASR-1001-X. I know that the max throughput/backplane speed is 20G. I'm confuse of the Packet Per Second performance measurement from Cisco. Could anyone help to explain and how to find this? Does it depend on bandwidth? I see in some doc:

ASR1000-ESP20 PPS (Packet Per Second): 25,430,000 <=> 13,020.16 Mbps

thank you in advance for help.

• This router type will forward not more than max. 16Mpps OR 20Gbps depending on what will be exceeded first. When you know your packet size, you can do some math like: 16.000 packets per second * 1500 bytes per packet = 24.000.000 bytes per second * 8 = 192.000.000 bps = ~180Mbps. That means in theory, with 1500 byte packets, you will only exceed max packets per second. – Markus Dec 4 '18 at 14:29
• @Markus, I think Cisco's specifications for pps are using 64 byte packets. You can usually find that somewhere in the fine print. Most vendors use small packets for the pps rating. – Ron Maupin Dec 4 '18 at 16:21
• Thank you all, @Markus taking the small packet as 64 bytes. I do the math and I find : 25430000 packets per second * 64 bytes * 8 = 13020160000bps =~ 13 Gbps (witch match the value above see somewhere in doc) – Mamitiana Ra Dec 5 '18 at 14:08
• Is it "Up to 200-Gbps system throughput and up to 130 millions of packets per second (mpps) to address WAN aggregation needs" Note there are variant models with modules for 20 to 200 Gbit/sec throughput. cisco.com/c/en/us/products/collateral/routers/… – jonathanjo Dec 5 '18 at 15:09
• @jonathanjo , In my case, it's a model with max of 20Gbit/sec throughput. thank you for the datasheet – Mamitiana Ra Dec 6 '18 at 6:05