Hi all, need some advice please!
We recently upgraded our VirginMedia service from 152Mpbs to 350Mpbs (with static IPs and SLA). We go through a Cisco892 ISR, so we can use WAN failover (to an old ADSL line) and other features. I used to get 152Mbps fine with our old connection, but since the upgrade it's actually slower (100Mbps max download on speed-tests). When I connect directly to the Virgin router I get nearly 400Mbps, so clearly the problem is with our Cisco configuration. I found that by removing IPS from the WAN interface, it now maxes out at about 180Mbps, so nearly a 100% increase. I've determined that the general issue is that I'm maxing out the capability of the CPU on the Cisco router. Doing a "show processes cpu history" command in the CLI confirms that it is indeed struggling.
A few questions:
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Why is the relatively-expensive Cisco892 router so much slower than the relatively-cheap Virgin router? I assume this is because the Cisco box is doing everything through the processor and offering more services/inspection at the cost of performance?
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Is there a quick-fire solution to improving this speed, i.e. anything else I can disable on the router? The only things I'm using now that could be using CPU is the general firewall (access-group in) and the SLA for failover so I don't think there is...
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What would be a good upgrade for my situation? I want to stick with Cisco preferably. Something that's going to do 400Mbps without killing the CPU, but not too overkill!
Many thanks in advance!
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