Re: "Dynamic Load balancing or 802.1AX" in Juniper, something

Totally offtopic, but fun ;-)

It could be referring to the lack of default load balancing in Junos, which
can be enabled through policy-options for individual routes.

For example, with the following configuration:

interfaces {
    fe-0/0/0 {
        vlan-tagging;
        unit 1 {
            vlan-id 1;
            family inet {
                address 192.168.1.1/24;
            }
        }
        unit 2 {
            vlan-id 2;
            family inet {
                address 192.168.2.1/24;
            }
        }
    }
}
routing-options {
    static {
        route 0.0.0.0/0 next-hop [ 192.168.1.254 192.168.2.254 ];
    }
}

We'll end-up having only one default route in the routing table:

------------------------------8<------------------------------
ipexpert_at_Pod401-R1# run show route 0.0.0.0/0 exact detail

inet.0: 5 destinations, 5 routes (5 active, 0 holddown, 0 hidden)
0.0.0.0/0 (1 entry, 1 announced)
        *Static Preference: 5
                Next hop type: Router
                Address: 0x1695010
                Next-hop reference count: 1
                Next hop: 192.168.1.254 via fe-0/0/0.1
                Next hop: 192.168.2.254 via fe-0/0/0.2, selected <------
see here
                State: <Active Int Ext>
                Age: 2:59
                Task: RT
                Announcement bits (1): 0-KRT
                AS path: I

ipexpert_at_Pod401-R1# run show route forwarding-table
Routing table: default.inet
Internet:
Destination Type RtRef Next hop Type Index NhRef Netif
default user 0 78:fe:3d:d4:86:80 ucst 553 4
fe-0/0/0.2 <------ see here
[...]
------------------------------8<------------------------------

However, I can add a policy to enable load balancing using policy-options:

policy-options {
    policy-statement Enable-ECMP {
        from {
            protocol static;
            route-filter 0.0.0.0/0 exact;
        }
        then {
            load-balance per-packet;
        }
    }
}
routing-options {
    forwarding-table {
        export Enable-ECMP;
    }
}

I get a little bit different result:

------------------------------8<------------------------------
ipexpert_at_Pod401-R1# ...show route forwarding-table destination 0.0.0.0/0
Routing table: default.inet
Internet:
Destination Type RtRef Next hop Type Index NhRef Netif
default user 0 ulst 262142 2
                              78:fe:3d:d4:86:80 ucst 552 3 fe-0/0/0.1
                              78:fe:3d:d4:86:80 ucst 553 3 fe-0/0/0.2
------------------------------8<------------------------------

Strange new world, eh? ;-)

--
Marko Milivojevic - CCIE #18427 (SP R&S)
Senior CCIE Instructor - IPexpert
On Thu, Apr 5, 2012 at 07:21, Group Study <gs_at_netengineer.org> wrote:
> Ohhh... that terminology is for NIC teaming on the server side...
> gotcha.. but I thought this term was used by Juniper as well?
>
> Yep, LACP and PaGP for Cisco but thought there was some thing specific
> to "Dynamic Load Balancing" from Juniper?
>
>
>
>
> On Thu, Apr 5, 2012 at 9:53 AM, Ryan West <rwest_at_zyedge.com> wrote:
> > On Thu, Apr 05, 2012 at 09:36:38, Group Study wrote:
> >> Subject: OT: "Dynamic Load balancing or 802.1AX" in Juniper, something
> >> similar in Cisco?
> >>
> >> Hi Guys,
> >>
> >> Any one know where on Cisco's site I can get more info on "Dynamic
> >> Load Balacing" or 802.1AX? I guess the feature in quotes is something
> >> related to Juniper and want to find out if Cisco has something
> comparable.
> >>
> >>
> >
> > Yes, Cisco supports LACP.  Dynamic Load Balancing is a terminology that
> HP teaming software will use as well, they all basically mean
> 802.3AD/802.1AX.
> >
> > -ryan
>
>
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