[c-nsp] Per packet Load balancing

[Amol Sapkal]

Hi,

The routes are IP based. The one *not* showing as point2point is a
multipoint interface.
Thanks for the explanation of the command.
Actually, I have Internet connecting to R2 too, but I cannot load
balance on the network entry points, hence all the reroute.

Thanks Rodney and all!

On Tue, 7 Sep 2004 15:36:38 -0400, Rodney Dunn <rodunn at cisco.com> wrote:
> >
> > my_router#sh ip cef 2.2.2.134 int
> > 2.2.2.128/28, version 446, per-packet sharing
> > 0 packets, 0 bytes
> >   Flow: AS 0, mask 28
> >   tag information set
> >     local tag: 4
> >   via 2.2.2.2, 0 dependencies, recursive
> >     traffic share 1, current path
> >     next hop 2.2.2.2, Serial9/1/5.3 via 2.2.2.0/30
> >     valid adjacency
> >   via 1.1.1.1, 0 dependencies, recursive
> >     traffic share 1
> >     next hop 1.1.1.1, Serial9/1/3.100 via 1.1.1.1/32
> >     valid adjacency
> >
> >   0 packets, 0 bytes switched through the prefix
> >   tmstats: external 0 packets, 0 bytes
> >            internal 0 packets, 0 bytes
> >   Load distribution: 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 (refcount 1)
> >
> >   Hash  OK  Interface                 Address         Packets  Tags imposed
> >   1     Y   Serial9/1/5.3             point2point        6437    none
> >   2     Y   Serial9/1/3.100           1.1.1.1    6438    none
> >   3     Y   Serial9/1/5.3             point2point        6438    none
> >   4     Y   Serial9/1/3.100           1.1.1.1    6438    none
> >   5     Y   Serial9/1/5.3             point2point        6438    none
> >   6     Y   Serial9/1/3.100           1.1.1.1    6438    none
> >   7     Y   Serial9/1/5.3             point2point        6438    none
> >   8     Y   Serial9/1/3.100           1.1.1.1    6438    none
> >   9     Y   Serial9/1/5.3             point2point        6438    none
> >   10    Y   Serial9/1/3.100           1.1.1.1    6435    none
> >   11    Y   Serial9/1/5.3             point2point        6437    none
> >   12    Y   Serial9/1/3.100           1.1.1.1    6437    none
> >   13    Y   Serial9/1/5.3             point2point        6437    none
> >   14    Y   Serial9/1/3.100           1.1.1.1    6436    none
> >   15    Y   Serial9/1/5.3             point2point        6437    none
> >   16    Y   Serial9/1/3.100           1.1.1.1    6437    none
> > my_router#
> 
> Make sure you always point the static route at the next hop and not
> at the interface.  I'm not sure if that's why one shows the next hop
> and one shows point2point.
> 
> The routes are different in some way:
> 
> >   via 2.2.2.2, 0 dependencies, recursive
> >     traffic share 1, current path
> >     next hop 2.2.2.2, Serial9/1/5.3 via 2.2.2.0/30
> >     valid adjacency
> >   via 1.1.1.1, 0 dependencies, recursive
> >     traffic share 1
> >     next hop 1.1.1.1, Serial9/1/3.100 via 1.1.1.1/32
> >     valid adjacency
> 
> There are 16 buckets and with two paths the has will be 8 for each.
> 
> It is exactly equal for the two paths:
> 
> Look at the packet counters for each "6438, etc...".
> 
> If you are looking at 'sh int' for the rate it's an average so it
> takes time to catch up.
> 
> 
> 
> >
> >
> > >
> > > >
> > > > Thanks - Amol
> > > >
> > > >
> > > > >
> > > > >
> > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > On Tue, 7 Sep 2004 22:04:49 +0530, Amol Sapkal <amolsapkal at gmail.com> wrote:
> > > > > > > Thanks!
> > > > > > > On Tue, 7 Sep 2004 12:20:59 -0400, Rodney Dunn <rodunn at cisco.com> wrote:
> > > > > > > > You shouldn't do it that way.
> > > > > > > >
> > > > > > > > You can configure CEF to do per-packet load
> > > > > > > > balancing.
> > > > > > > >
> > > > > > > > Turn on CEF globally and then on the inbound
> > > > > > > > interface feeding the downstream equal cost paths
> > > > > > > > do "ip load-sharing per-packet".
> > > > > > > >
> > > > > > > > Don't leave it like you have it now.  You are process
> > > > > > > > switching all the traffic.
> > > > > > >
> > > > > > >
> > > > > > > This works, I checked on the client router interface. The incoming
> > > > > > > traffic is load balanced.
> > > > > > >
> > > > > > > Apologies for asking it here (and not reading it myself), what does
> > > > > > > 'ip load-sharing per-packet' actually do?
> > > > > > >
> > > > > > > >
> > > > > > > > Rodney
> > > > > > >
> >
> >
> >
> > --
> > 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 
- Mahatma Gandhi
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