[c-nsp] Cisco 7301 limitation ?

[Arie Vayner]

Even though it is a software router, there's a difference if packets are
forwarded on the fast path or slow path (punt).

Arie

On Thu, Apr 20, 2017 at 2:49 PM Bill Blackford <bblackford at gmail.com> wrote:

> It is a software router. I've had these fall over from too many small
> packets.
>
> Sent from my iPhone
>
> > On Apr 20, 2017, at 13:07, Arie Vayner <ariev at vayner.net> wrote:
> >
> > I would check for MTU and fragmentation issues... If the router is
> > fragmenting, it would bring the CPU up...
> >
> > On Thu, Apr 20, 2017 at 10:41 AM Olivier CALVANO <o.calvano at gmail.com>
> > wrote:
> >
> >> Hi
> >>
> >> i have a problems with a cisco 7301 IOS:
> >>
> >> Cisco IOS Software, 7301 Software (C7301-ADVENTERPRISEK9-M), Version
> >> 12.2(33)SRD5, RELEASE SOFTWARE (fc2)
> >>
> >> No special config on C7301, no qos, no access list, no filter ... only
> IP
> >> Route
> >>
> >>
> >>
> >> On this router, i have two ports used:
> >>    GigabitEthernet0/0
> >>    GigabitEthernet0/1
> >>
> >> Port 0/0 it's a 1 Gbits link
> >> Port 0/1 it's a 1 Gbits link but i two vlan each vlan is a fiber remote
> >> link, one of 20Mbits and the second 500 Mbits
> >>
> >>
> >> When i start a upload from a pc behind the 500 Mbits vlan link, no
> >> problems, i have 500 Mbits and cpu is good:
> >> CPU utilization for five seconds: 33%/22%
> >>
> >>
> >>
> >> but when i download, i am limited to 266 Mbits and the CPU of the C7301
> are
> >> high:
> >>
> >> CPU utilization for five seconds: 98%/43%
> >>
> >>
> >> anyone know this problems ?
> >>
> >> It's possible because the cisco don't know that the vlan is limited at
> 500
> >> mbits and he want sent at 1 gbits ?
> >>
> >> regards
> >> Olivier
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