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----
-date: 2020-02-16
-title: "Equal-Cost Multipath (ECMP) routing"
-linkTitle: "Equal-Cost multipath (ECMP) example"
-description: "A very quick example of ECMP"
-author: Dimitri Staessens
----
-
-As promised, I added equal cost multipath routing to the Ouroboros
-unicast IPCP. I will add some more explanations later when it's fully
-tested and merge into the master branch, but you can already try it.
-You will need to pull the _be_ branch. You will also need to have
-_fuse_ installed to monitor the flows from _/tmp/ouroboros/_. The
-following script will bootstrap a 4-node unicast network on your
-machine that routes using ECMP:
-
-```bash
-#!/bin/bash
-
-# create a local IPCP. This emulates the "Internet"
-irm i b t local n local l local
-
-#create the first unicast IPCP with ecmp
-irm i b t unicast n uni.a l net routing ecmp
-
-#bind the unicast IPCP to the names net and uni.a
-irm b i uni.a n net
-irm b i uni.a n uni.a
-
-#register these 2 names in the local IPCP
-irm n r net l local
-irm n r uni.a l local
-
-#create 3 more unicast IPCPs, and enroll them with the first
-irm i e t unicast n uni.b l net
-irm b i uni.b n net
-irm b i uni.b n uni.b
-irm n r uni.b l local
-
-irm i e t unicast n uni.c l net
-irm b i uni.c n net
-irm b i uni.c n uni.c
-irm n r uni.c l local
-
-irm i e t unicast n uni.d l net
-irm b i uni.d n net
-irm b i uni.d n uni.d
-irm n r uni.d l local
-
-#connect uni.b to uni.a this creates a DT flow and a mgmt flow
-irm i conn name uni.b dst uni.a
-
-#now do the same for the others, creating a square
-irm i conn name uni.c dst uni.b
-irm i conn name uni.d dst uni.c
-irm i conn name uni.d dst uni.a
-
-#register the oping application at 4 different locations
-#this allows us to check the multipath implementation
-irm n r oping.a i uni.a
-irm n r oping.b i uni.b
-irm n r oping.c i uni.c
-irm n r oping.d i uni.d
-
-#bind oping program to oping names
-irm b prog oping n oping.a
-irm b prog oping n oping.b
-irm b prog oping n oping.c
-irm b prog oping n oping.d
-
-#good to go!
-```
-
-In order to test the setup, start an irmd (preferably in a terminal so
-you can see what's going on). In another terminal, run the above
-script and then start an oping server:
-
-```bash
-$ ./ecmpscript
-$ oping -l
-Ouroboros ping server started.
-```
-
-This single server program will accept all flows for oping from any of
-the unicast IPCPs. Ouroboros _multi-homing_ in action.
-
-Open another terminal, and type the following command:
-
-```bash
-$ watch -n 1 'grep "sent (packets)" /tmp/ouroboros/uni.a/dt.*/6* | sed -n -e 1p -e 7p'
-```
-
-This will show you the packet statistics from the 2 data transfer
-flows from the first IPCP (uni.a).
-
-On my machine it looks like this:
-
-```
-Every 1,0s: grep "sent (packets)" /tmp/ouroboros/uni.a/dt.*/6* | sed -n -e 1p -e 7p
-
-/tmp/ouroboros/uni.a/dt.1896199821/65: sent (packets):                            10
-/tmp/ouroboros/uni.a/dt.1896199821/67: sent (packets):                             6
-```
-
-Now, from yet another terminal, run connect an oping client to oping.c
-(the client should attach to the first IPCP, so oping.c should be the
-one with 2 equal cost paths) and watch both counters increase:
-
-```bash
-oping -n oping.c -i 100ms
-```
-
-When you do this to the other destinations (oping.b and oping.d) you
-should see only one of the flow counters increasing.
-
-Hope you enjoyed this little demo!
-
-Dimitri