On 3/28/2011 9:14 PM, Frank Bulk wrote:
We have two 3845's as border routers, each with three GigE interfaces (one
facing upstream, the other downstream, the third facing the other 3845).
The first 3845 has a typical packet-size mix (residential/business Internet)
is consistently maxing out at 400 Mbps (predominately ingress because of
asymmetric routing) running at about 43 kpps and 40% CPU. It's flat-lines
very evenly, uncannily so. We checked and double-checked transport and it's
set much higher, the same as the second 3845.
The second 3845, which has a mix of both ingress and egress traffic at a
combined 82 kpps (35 kpps ingress/50 kpps egress) but lower combined 360
Mbps operates at a higher CPU (presumably because there's also egress
traffic) with no flatlining.
The ACLs are BCP 38-oriented with eBGP; no rate-limiting. We're running
124-11.XW2.
Any ideas? The numbers are well below Cisco's router spec sheet.
Frank
The first idea is pretty obvious: different packet sizes. Why so? The
second idea would be to make sure you are staying in the CEF path as
much as possible. Verify that yet?
tv
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