While we are on ECMP topic... In L3VPN, when I've learned say, 3 different routes all using different MPLS tags to the 3 remote PE's, is there a way to ECMP hash across all of the paths to load balance? Aaron
On May 16, 2018, at 6:32 PM, Thomas Bellman <bellman@nsc.liu.se> wrote:
On 2018-05-16 15:22, Adam Kajtar wrote:
I wasn't using per-packet load balancing. I believe juniper default is per IP.
The Juniper default is to not do ECMP at all. Only a single route is programmed into the FIB for each prefix in your RIB. If you e.g. have routes to 198.51.100.0/24 pointing to ten different ports, all traffic to that entire /24 will go out over a single port, unless you have explicitly enabled ECMP.
To enable ECMP, you need this:
policy-options { policy-statement ecmp { then { load-balance per-packet; } } } routing-options { forwarding-table { export ecmp; } }
in your configuration. Note also that "per-packet" is a mis-nomer; it is really "per flow", based on a hash of the L3/L4 headers.
'show route forwarding-table destination 198.51.100.0/24' shows if you actually have multiple routes in your FIB.
/Bellman