[c-nsp] Cisco 7301 limitation ?

Arie Vayner ariev at vayner.net
Thu Apr 20 16:07:39 EDT 2017


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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