UC540 Throughput speeds

Unanswered Question
May 25th, 2012

Recently installed a UC540 and I've noticed that the UC540 is severely capping our broadband speeds.

We have a 100MB connection here presented by a virgin modem.

When connected via the UC540, the best speeds we see (with inspection & ACL's disabled) is 30MB.

Has anyone else experienced this?

Official UC support told me it's a hardware limitation on the UC540. 

I have this problem too.
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David Trad Fri, 05/25/2012 - 19:13

Hi Pete,

The UC-540/560 WAN ports do not seem to have the same throughput speeds as does the original UC-520... I don't know why this is as I have never bothered to see if the hardware is actually different.

However what I can tell you is that you should be able to get about 75-80Mbps on the WAN port, then you have to factor in other stuff that the IOS does with the routing as the UC's are not hardware based routing, and you take off a further 20-30Mbps throughput.

So I would pin the maximum throughput on the UC's at about 60Mbps if you were lucky, I have personally put this to test on well over a 100 deployments, pretty much gave up measuring this after the speeds were consistent.

My advice if you want to achieve full 100Mbps is to get a proper WAN router (Ethernet based) like the new SRP-500 series which can achieve almost the full 100Mbps (Not quite average speed throughput was about 96Mbps). Then you plug it into the trunk port of a decent Cisco switch and set the smartport role as a router using CCA.

Now I must warn you of something, and I have never spoken out about this before, but recently I have been forced to look into older jobs I have done last year before I took a Hiatus from working on Cisco appliances, and discovered that the new Sx300 series switches are just not cut out and fall short desperately of the quality that the ESW switches had, the amount of complaints I have received in the last 5 months regarding these switches is mind blowing, I do not know why as this is not something I have seen before with Cisco in probably over 6-7 years, and I am not sure what other alternative Cisco SMB switch can be used - Maybe they will address some of the issues seen in future firmware updates, I truly hope so.

Good Luck




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Posted May 25, 2012 at 8:54 AM
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