[c-nsp] 7301 NPE-G1 gigabit overruns

[Rodney Dunn]

Whenver you reference load it's always best to specify both
bps and pps because it's the pps that drives the switching
capacity of the box to it's limits the fastest. It has to do
the work on every packet.

It's software forwarding only.

You would be better off with an ASR1000.

I forget the PAUSE frame scneario with it.

Rodney

On Wed, Feb 11, 2009 at 11:36:14PM +1000, john douglas wrote:
> Hi All,
> 
> I am hoping someone may have some guidance.
> 
> We have some 7301 NPE-G1 running 12.2(33)SRC3 connected to Catalyst
> 3560 switch, dot1q trunking with a few Vlans. I find on the 7301
> router whenever I try to drive a given gigabit sub interface beyond
> about 200mbps I begin to see Input Errors (Overruns) incrementing on
> the physical interface and begin exhibiting packet loss. Under the
> show controller information I see rx_overrun and rx_int_drop
> incrementing - all other Rx error values under "Statistics" section
> are zero. On the switch I see pause input incrementing, but no errors.
> Cpu is 40%.
> 
> I have read other postings about this being attributed to microburst
> of traffic but I am still a little unclear I am trying to work out
> 
> 1) Does the G1 correctly support pause frames?
> 
> 2) Are there any knobs we can tweak - or we simply hitting the limits
> of the silicon?
> 
> The short term solution has been to spread the vlan sub interfaces
> over the 3 gig interfaces however this leaves me in a situation where
> I cannot really use EEM to migrate sub interface config from one
> gigabit interface to another should there be a failure, as the target
> interface will being exhibiting overruns and loss.
> 
> Any advice appreciated,
> 
> Kind regards,
> 
> John
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