The use of tunnel keys can also cause punted packets on 6k
On Mon, Mar 25, 2013 at 8:36 AM, Samir Abidali <[email protected]>wrote: > I am using Different source IP address, I will try user a loopback > interface as a change and see if that will work. > > Appreciate your help Simon > > Thank you > > Best Regards > Samir Abid Ali > Core Network Manager > Gorannet ISP > Mobile:07703-587-625 > Office:053 5111 000 ext. 1032 > > -----Original Message----- > From: Simon Lockhart [mailto:[email protected]] > Sent: Sunday, March 24, 2013 2:14 PM > To: Samir Abidali > Cc: [email protected] > Subject: Re: [c-nsp] High CPU utilization on sup720 with GRE > > On Sun Mar 24, 2013 at 02:06:09PM +0300, Samir Abidali wrote: > > Can you somebody help me in understanding whey GRE tunnel Cisco > > WS-SUP720-3BXL , with two GRE tunnel configured will spike the cpur to > 99% > > when the traffic goes beyond 30mbps. > > > > According to documentation, the GRE is hardware accelerated, please note > that > > the two tunnel interface has two different source interface ( SVI source > ip > > address ) > > It's important to use a different source interface for each Tunnel (we use > loopback interfaces per tunnel). > > I'm doing over 1Gbps of GRE spread over multiple tunnels, and my CPU is > running > at around 30%. > > I'd probably start by looking at MTU - is this box having to do a lot of > fragmentation? That will kill the CPU very quickly. > > Simon > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
