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Cisco ASR throughput

Hi everyone!

Got a short question about the ASR 1001 and I'm sure somebody here can help me out :-)

For a lot of routers Cisco specifies the throughput in pps. They write that the 3925 non-E can do 833kpps which would be about 426 mbit in a worst case scenario (just regarding packetsize!!), for example. Regarding the ASR 1001 Cisco says 2.5 gbit or 5 gbit with an additional license. The additional license enables the remaining half of the cores (hardware), iirc. So does the 2.5 gbit limit mean that's for 64 byte packets or just throughput, no matter of the actual packetsize???? I'm wondering if 2.5 gbit (or 5 gbit) is the maximum that the ASR is able/willing to route or if it can go way beyond if there are not just 64 byte packets.

Big thanks for any help and have a nice weekend,


PS: Talking about plain routing without any fancy stuff :-)

2 Replies 2

Joseph W. Doherty
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Usually, when PPS is given, it's provided for minimum size Ethernet, but in some of the older Cisco performance documents, PPS didn't take into account L2.

I've attached one of Cisco later performance documents for the G2 ISRs.  (Sorry, I don't have similar for ASRs).  There you'll find the non-E 3925 can, for maximum size Ethernet, push up to 6.9 Gbps, but its only recommended for up to 100 Mbps (the latter accounts for duplex, mixed packets sizes, services and about a 25% CPU reserve).

I believe the ASR's bandwidth is also for minimum size Ethernet, but without services; also doesn't account for duplex.

The 2.5 Gbps should be good for a single gig duplex link (two gig interfaces), the 5 Gbps good for two gig duplex links (four gig interfaces).

On many platforms (especially software based routers), maximum PPS drops as packet size increases, but even with that drop, bandwidth throughput generally increases.

Thanks for the reply!

I'm pretty sure that the ASR 1001 could do more, but I'm still not aware of the licensing stuff :-)

Such a white paper for the ASR 1k series would be great.

I believe that the ASR 1001 will do 2.5 gbit with 64 byte packets as this would match with the other guides/performance sheets. The problem is that I don't have a possibility to test it and it would be bad if the ASR would just "drop" anything above 2.5 gbit (or 5 gbit), regardless of the packetsize. If this would be the case, than a 3945-E would scale higher (with large packets) than an ASR 1001 as with the 3945-E the CPU is the "bottleneck" and not some licensing stuff...

Thanks again and kind regards,


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