[c-nsp] ip load-sharing per-packet and RPF

[Amol Sapkal]

To make sure I am not confusing you, here is an output:


core#sh int s11/1/0 | in rate
  Queueing strategy: weighted fair
  30 second input rate 248000 bits/sec, 79 packets/sec
  30 second output rate 102000 bits/sec, 93 packets/sec
core#sh int s11/1/1 | in rate
  Queueing strategy: weighted fair
  30 second input rate 252000 bits/sec, 78 packets/sec
  30 second output rate 111000 bits/sec, 91 packets/sec
core#sh int s11/1/2 | in rate
  Queueing strategy: fifo
  30 second input rate 244000 bits/sec, 78 packets/sec
  30 second output rate 114000 bits/sec, 92 packets/sec
core#


If you see the packets are load balanced, but the traffic is not.




On Wed, 13 Oct 2004 00:34:25 +0530, Amol Sapkal <amolsapkal at gmail.com> wrote:
> On Tue, 12 Oct 2004 13:12:41 -0400, Marr, Joe <jmarr at brodart.com> wrote:
> > Sure,
> >
> > I'm a little dense today.
> >
> > I have 2 AT&T T1s going to the same pop router; they have static's
> > pointing to the serial interfaces (which are on the same router on my
> > side)and I have 2 defaults pointing to my serials back to them.
> >
> 
> Though I am not sure, if I understood your setup and the problem, I
> think the best way to load balance is point the default route to a
> loopback on your provider's router and put 2 static routes to that IP,
> via your T1s.
> I have a similar setup. I have ip cef enabled globally, and ip
> load-sharing per-packet enabled on the 3 outgoing interfaces, but I
> still do not see equal outgoing load on the interfaces.
> 
> 
> 
> 
> > Based on the util. graphs, the look almost mirrored (and yes, they are
> > reading different snmp interface IDs).
> >
> > I've never used CEF to control my traffic in this manner before, so
> > maybe it's my lack of understanding.
> >
> > So it could be asymmetrical, but I had thought that that using the "ip
> > load-sharing per-packet" resolved some if not all of that.
> >
> > Is the load sharing doing roundrobin or something. If that's the case
> > then why does several Cisco resources say that RPF supports per-packet
> > load sharing.
> >
> > Joe Marr
> >
> >
> >
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net
> > [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Rey Martin
> > Sent: Tuesday, October 12, 2004 12:44 PM
> > To: cisco-nsp at puck.nether.net
> > Subject: Re: [c-nsp] ip load-sharing per-packet and RPF
> >
> > I think it's because your network  has asymmetrical routing (2T1 and
> > load
> > balanced?)
> >
> > rey
> >
> > ----- Original Message -----
> > From: "Marr, Joe" <jmarr at brodart.com>
> > To: <cisco-nsp at puck.nether.net>
> > Sent: Tuesday, October 12, 2004 10:32 PM
> > Subject: [c-nsp] ip load-sharing per-packet and RPF
> >
> > > Is it possible to run "ip load-sharing per-packet" and "ip verify
> > > unicast reverse-path" on the same interfaces?
> > >
> > >
> > >
> > > I have 2 T1s that are load-balanced with my provider using "ip
> > > load-sharing per-packet". When I set "ip verify unicast reverse-path"
> > I
> > > begin to lose every other packet. I had thought Unicast RPF was
> > > compatible with CEF's per-packet and per-destination load sharing.
> > >
> > >
> > >
> > > Thanks in advance,
> > >
> > >
> > >
> > > Joe Marr
> > >
> > >
> > >
> > > _______________________________________________
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> >
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> >
> >
> >
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> >
> 
> 
> --
> Warm Regds,
> 
> Amol Sapkal
> 
> --------------------------------------------------------------------
> An eye for an eye makes the whole world blind
> - Mahatma Gandhi
> --------------------------------------------------------------------
> 


-- 
Warm Regds,

Amol Sapkal

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An eye for an eye makes the whole world blind 
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