From 815d129e72bfe54568d53b47cfb1e89ca84b9275 Mon Sep 17 00:00:00 2001 From: Yuri Volchkov Date: Wed, 8 Nov 2017 19:01:02 +0100 Subject: [PATCH] bgp-contd: too early to check connectivity to r20 The first thing I did in this assignment is disabled connection R1-R20. And spend some time trying to understand how it is even supposed to work, before I scrolled down and read that it is not supposed actually. So let's not ask a person to check if he can reach ALL parts of the network, but only reasonable for now parts. Edit by Knorrie: * Explicitely mention what can be disabled now, so that we don't run into the situation above. :) --- bgp-contd/README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/bgp-contd/README.md b/bgp-contd/README.md index d6ef9c1..f271b60 100644 --- a/bgp-contd/README.md +++ b/bgp-contd/README.md @@ -202,7 +202,7 @@ Now, do the following things: 2001:db8:10::/48 via 2001:db8:10:4::10 on ebgp_r10 [ebgp_r10 2015-11-28] * (100) [AS65010i] * Check that you can reach every external network from every router in all of the three networks. You can use the script `bgp-contd/lxc/check_connectivity.sh` to check that every router can ping any other router. - * Try disabling some of the links between routers by using the `disable`/`enable` commands on the bird command line, and check if you still can reach all parts of the network. + * Try disabling the link between `R0` and `R11`, by using the `disable`/`enable` commands on the bird command line, from either side. Check if you still can reach all parts of the network. Do the same for the link between `R1` and `R10`. If this succeeds your iBGP configuration is correct. * Change `import` and `export` filters in the `protocol bgp ebgp_r*` sections in `bird6.conf` so that you end up with a situation where all traffic is forced into an asymmetric traffic pattern in which traffic from `AS65000` to `AS65010` has to leave via `R1` to `R10`, and traffic back flows over `R11` to `R0`. Verify the changes seen in bird `show route all` output when you change filters. ## A closer look at the BIRD configuration