[j-nsp] Configuring Per-Packet Load Balancing

[Pablo Varela]

I think that you could also apply the load-balance per-packet knob to
only some prefixes, since it's a regular policy action.

According to JunOS documentation: "To configure the load-balance
per-packet action, include the load-balance per-packet action in a then
statement or a route-filter option in a from statement in a routing
policy."

The you can tag or somehow identify the networks you want to
load-balance and have something like:

policy-options policy-statement picky-load-balance {
    term tagged-routes {
        from tag 1;
        then {
            load-balance per-packet;
        }
    }
    term anything-else {
        then accept;
    }
}

I'm not sure taht the last term is needed but just to be on the safe
side.
Then you apply this policy to export the routing table to the forwarding
table.

Pablo


On Tue, 11 Oct 2005 16:44:38 +0200, "Hannes Gredler"
<hannes at juniper.net> said:
> 
> 
> Mesut Mutlu wrote:
> > Hi,
> > 
> >  First of all thanks for your help. 
> >  I think If I made this configuration it will be
> > generally used by the router. I need to explain that I
> > just want to configure load-balance per-packet
> > configuration only for a specific peer not for all
> > other peers with who I have option to make this kind
> > of configuration. 
> 
> correct - below configuration will enable hash-based load-balancing
> for all IGP equal cost routes in the master routing tables;
> note that the keyword(s) here is "IGP equal cost" -
> if you have e.g. _two_ eBGP peerings to your neighbor AS
> then this will not help much (as only one next-hop)
> per eBGP session is available in that scenario ...
> 
> it will work however if you have _one_ EBGP session between
> your loopbacks and a static route to the remote-loopback
> holding equal-cost next-hops.
> 
> so in other words even if you apply the lbpp policy globaly
> to inet.0 it may have no impact unless you supply equal-cost
> forwarding next-hops.
> 
>  > I know routes which are advertised
> > by this peer to me using BGP. Is it possible a
> > specific configuration to be made only for a specific
> > peer by using routes advertised by him or by using
> > something else known about this peer. 
> >  Thanks again.
> >  Yours Sincerely,
> >    Mesut MUTLU
> 
> 
> > --- Hannes Gredler <hannes at juniper.net> wrote:
> > 
> > 
> >>make sure you have the following config:
> >>
> >>routing-options {
> >>     forwarding-table {
> >>         export lbpp;
> >>     }
> >>}
> >>policy-options {
> >>     policy-statement lbpp {
> >>         then {
> >>             load-balance per-packet;
> >>         }
> >>     }
> >>}
> >>
> >>then the router should install more than one [upto
> >>16]
> >>forwarding nexthops;
> >>
> >>--
> >>
> >>you can check if load-balancing is working using
> >>a "show route forwarding-table" and check
> >>if the route in question has a
> >>"ulst" (=unilist) entry attached;
> >>
> >>HTH,
> >>
> >>/hannes
> >>
> >>Mesut Mutlu wrote:
> >>
> >>>Hi all,
> >>>
> >>> I have a bit trouble configuring per-packet
> >>>load-balancing, for that reason I need your help
> >>
> >>about
> >>
> >>>some topics. 
> >>> How a per-packet load-balancing can be configured
> >>
> >>>for packets which will be sent to a directly
> >>
> >>connected
> >>
> >>>peer router knowing routes advertised by and which
> >>>belongs to this peer.
> >>> In [policy-options policy-statement] using "from
> >>>statement" is it posible with giving routes of the
> >>>peer router to configure per-packet load balancing
> >>
> >>or
> >>
> >>>is there any other way to manage configuration.
> >>
> >>Please
> >>
> >>>send me configuration examples and explanation
> >>
> >>about
> >>
> >>>this topic if you have.
> >>> Thanks a lot for you help. 
> >>>Have a nice day.
> >>> 
> >>>
> >>>
> >>>	
> >>>		
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> >>>http://mail.yahoo.com
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> >>
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> >>
> > 
> > 
> > 
> > 
> > 		
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