Thanks.
I did read this. However, this doesn't really answer
my original question.
I guess I like to understand the algorithm.
--- Stephen Gill <gillsr@yahoo.com> wrote:
> This excerpt from the manual should answer your
> question:
>
> JUNOS Routing and Routing Protocols v5 Manual, page
> 126
>
> ... snip snip ...
>
> On routers with the Internet Processor II ASIC, when
> per-packet load
> balancing is configured, traffic between routers
> with multiple paths is
> divided into individual traffic flows (up to a
> maximum of 16 equal-cost
> load-balanced paths). Packets for each individual
> flow are kept on
> a single interface. To recognize individual flows in
> the transit
> traffic, the router examines each of the following:
> ! Source IP address
> ! Destination IP address
> ! Protocol
> ! Source port number
> ! Destination port number
> ! Interface through which the packet entered the
> router
>
> ... snip snip ...
>
> The new tag offered in JUNOS 5.0 called
> "load-balance per-flow" simply
> allows you to modify the behavior already enabled
> with the "per-packet"
> tag. More specifically, it allows you to determine
> what defines a flow:
> layer 3 information (IP) or layer 4 information
> (TCP/UDP).
>
> As a side note, the manual does not state what the
> *actual* algorithm is
> for path selection. If anyone knows it would be
> nice to hear.
> Predicting which interface a flow will pass through
> could come in handy.
> (something like XOR of all variables listed above
> and the # of equal
> cost paths?)
>
> -- steve
>
> -----Original Message-----
> From: Andrew Smith [mailto:as160@yahoo.com]
> Sent: Thursday, October 18, 2001 12:45 AM
> To: juniper-nsp@puck.nether.net
> Subject: Per packet load balancing
>
> Hi, all
>
> I have a question regarding this.
>
> If I've enabled per-packet load balancing for all
> routes. Assuming IP2 in this case. As stated on the
> doc:
>
> "
> user@host# set policy-options policy-statement
> load-balancing-policy then load-balance per-packet
>
> user@host# set routing-options forwarding-table
> export
> load-balancing-policy"
>
> Assume I have 4 equal cost links for 8 destinations.
>
> With the above config, will each link carry the same
> number of destinations? (i.e. 2 destinations per
> link)
>
> What determines which destination is assigned to
> which
> link?
>
> I know you could achieve this by using filtering,
> however, I like to know what is the default behavior
> is.
>
> TIA
> ---andrew
>
>
>
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This archive was generated by hypermail 2b29 : Mon Aug 05 2002 - 10:42:37 EDT