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Hi Andrew,
There's a pretty good explanation of the behaviour on Juniper's
website. Just go to http://www.juniper.net/ and put "per packet load
balancing" in the search pane.
The Generic Routing Config pdf has a good explanation at
http://www.juniper.net/techpubs/software/junos50/swconfig50-routing/do
wnload/routing-generic-config.pdf
In short, the behaviour differs based on whether you use an IP I or
an IP II.
With an IP I, you get what I would consider true per packet load
sharing... i.e. packets are placed onto each path in a round-robin
basis.
With an IP II, you get something more like per-flow load sharing...
i.e. each new flow is randomly associated with a next-hop and, until
there is a routing update, it persists with that next-hop.
Regards,
Guy
> -----Original Message-----
> From: Andrew Smith [mailto:as160@yahoo.com]
> Sent: Tuesday, October 23, 2001 8:16 AM
> To: juniper-nsp@puck.nether.net
> Subject: Per packet load balancing -- 2nd try
>
>
> Hi, all
>
> I will try to ask this questions again and hope some
> get some expert advice on this topic.
>
> What I have is the following, all boxes have IP2. I
> have per-packet load balancing configured.
>
> ----
> M40 ---- M20 (advertising 1.0.0.0/24
> ---- 1.0.1.0/24
> ---- 1.0.2.0/24
> 1.0.3.0/24)
>
> 4 paths between M40 and M20 are equal cost. M20 is
> advertising 4 destinations via OSPF to M40. What I've
> seen on M40's routing table is:
>
> 1.0.0.0/24 via path 1
> via path 2
> via path 3
> >via path 4
>
> 1.0.0.0/24 via path 1
> via path 2
> via path 3
> >via path 4
>
> 1.0.0.0/24 via path 1
> via path 2
> >via path 3
> via path 4
>
> 1.0.0.0/24 via path 1
> via path 2
> >via path 3
> via path 4
>
> So, how is the next-hop selected? randomly? In this
> case, why are the other 2 paths not being utilized?
> I turned on trace options for OSPF, but couldn't
> really extract the info I need.
>
> TIA for any pointers.
> ---andrew
>
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