[c-nsp] 7301 NPE-G1 gigabit overruns

[Tassos Chatzithomaoglou]

We had a similar case with microbursts and lots of small packets and after moving to NPE-G2, we're very happy with it.
Traffic goes up, CPU is blocked at 75%, still no sign of drops.

Regarding the pause frames, i'm too very confused about them being supported.
http://markmail.org/message/y7bjuudmbrfofp6z

--
Tassos

Lars Lystrup Christensen wrote on 11/02/2009 15:47:
> Hi John
> 
> We had the same issue a few years ago on a Cisco 7204VXR with the NPE-G1 processor. I believe we were told, that we had hit the max capacity of the router.
> 
> ______________________________________
> 
> Med venlig hilsen / Kind regards
> 
> Lars Lystrup Christensen 
> Director of Engineering, CCIE(tm) #20292
> 
> Danske Telecom A/S
> Sundkrogsgade 13, 4 
> 2100 K?benhavn ? 
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of john douglas
> Sent: 11. februar 2009 14:36
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] 7301 NPE-G1 gigabit overruns
> 
> 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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