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diff --git a/content/en/blog/news/20200216-ecmp.md b/content/en/blog/news/20200216-ecmp.md deleted file mode 100644 index ce632c9..0000000 --- a/content/en/blog/news/20200216-ecmp.md +++ /dev/null @@ -1,118 +0,0 @@ ---- -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 |