[j-nsp] JUNOSe and ECMP

Nitin Vig nitinvig at juniper.net
Mon Jan 28 10:17:19 EST 2008


If this is about JUNOSe, there is no specific knob for this it should
work by default. You may find this useful:

http://www.juniper.net/kb/viewka.jsp?txtKANumber=18702

Regards,
Nitin
-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Andy
Sent: Monday, January 28, 2008 8:08 PM
To: Sven Juergensen (KielNET)
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] JUNOSe and ECMP

To enable ECMP load balancing:

routing-options {
   forwarding-table {
       export load-balancing-policy;
   }
}

policy-options {
   policy-statement load-balancing-policy {
       then {
           load-balance per-packet;
       }
   }

On Jan 28, 2008 8:54 AM, Sven Juergensen (KielNET)
<s.juergensen at kielnet.de> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi list,
>
> warming up the topic once again ;)
>
> Scenario: two routers connected
> using 2x GIGE. Both of them having
> a loopback interface. Now, either
> router has two static routes for
> the loopback interface of the opposite
> router.
>
> I understand that the default hashed
> mode is distributing the sessions
> roughly even across both links.
>
> Perhaps my way of judging on this
> lacks something but when I'm pinging
> the far end loopback across the
> router with the other loopback from
> a firewall, the traffic always picks
> the next hop which is listed first
> in the routing table, even when using
> multiple pings from different source
> adresses.
>
> This also happens when announcing
> the loopback interface via OSPF w/
> a maximum-paths of 4.
>
> Am I missing something? Is there
> a switch that enables ECMP globally
> for static routing or in general?
>
> Does the implementation of ECMP
> consider ICMP as something else?
>
> Thanks and best regards,
>
> sven03
>
> Mit freundlichen Gruessen
>
> i. A. Sven Juergensen
>
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