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The following is an example configuration file for a BIRD route server (http://bird.network.cz/) courtesy of Mike Barnard from the Uganda Internet eXchange Point (http://www.uixp.co.ug). This configuration includes support for selective policies by way of BGP Communities. For more information, including an example of a participant/peer client-side route configuration file, see here: http://uixp.co.ug/route-servers

### Begin Example Configuration

log "/var/log/bird.log" all;
log syslog all;

router id 123.124.125.126;
define myas = 12345;

protocol device { }

### The following function excludes weird networks such as
### rfc1918, class D, class E, and too long or too short prefixes

function avoid_martians()
prefix set martians;
{
martians = [ 169.254.0.0/16+, 172.16.0.0/12+, 192.168.0.0/16+, 10.0.0.0/8+,
224.0.0.0/4+, 240.0.0.0/4+, 0.0.0.0/32-, 0.0.0.0/0{25,32}, 0.0.0.0/0{0,7} ];

### Avoid RFC1918 and similar networks
if net ~ martians then return false;
return true;
}

function avoid_crappy_prefixes()
{
if net.len < 8 then return false;
if net.len > 24 then return false;
return true;
}

### Protocol Template

template bgp PEERS {
local as myas;
import all;
export all;
route limit 10000;
rs client;
}

### Generic Input Filter

filter bgp_in {
if avoid_martians() && avoid_crappy_prefixes() then accept;
else reject;
}

### BGP output filter (based on communities)

function bgp_out(int peeras)
{
if ! (source = RTS_BGP ) then return false;
if peeras > 65535 then return true; ### communities do not support AS32
if (0,peeras) ~ bgp_community then return false;
if (myas,peeras) ~ bgp_community then return true;
if (0, myas) ~ bgp_community then return false;
return true;
}

protocol bgp R_87654 from PEERS {
description "R_87654 - peer 1";
neighbor 123.124.125.200 as 87654;
import filter bgp_in;
export where bgp_out(87654);
}

protocol bgp R_76543 from PEERS {
description "R_76543 - peer 2";
neighbor 123.124.125.201 as 76543;
import filter bgp_in;
export where bgp_out(76543);
}

protocol bgp R_65432 from PEERS {
description "R_65432 - peer 3";
neighbor 123.124.125.202 as 65432;
import filter bgp_in;
export where bgp_out(65432);
}

protocol bgp R_54321 from PEERS {
description "R_54321 - peer 4";
neighbor 123.124.125.203 as 54321;
import filter bgp_in;
export where bgp_out(54321);
}

A Memorandum of Understanding is a key document for any Internet exchange point. It establishes a clear set of rules and guidelines which exchange participants can follow in order to ensure they remain in good standing. This document can also (optionally) include payment related terms and conditions.

This document template originates from the Tanzania Internet eXchange (TIX) and Uganda Internet eXchange Point (UIXP). We hope it serves as a useful reference for IXPs who have not yet implemented a Memorandum of Understanding or would like to compare and update their existing Memorandum of Understanding.