In this test case, we will deploy two machines: 10.0.3.114 for exabgp (it announces/32 prefix for blackholing on the core router side) and 10.0.3.115 (it emulates the core router). We will do this work on Debian 8 Jessie.
Install exabgp:
pip install exabgp
Create ExaBGP configuration:
vim /etc/exabgp_blackhole.conf
Here you can find an example for exabgp configuration:
group Core_v4 {
hold-time 180;
local-as 65001;
peer-as 1234;
router-id 10.0.3.114;
graceful-restart 1200;
static {
route 10.10.10.1/32 next-hop 10.0.3.114 community 65001:666;
}
neighbor 10.0.3.115 {
local-address 10.0.3.114;
description "Quagga";
}
}
We specify the current machine IP as the next hop because without it, Quagga ignores it: 10.0.3.114 rcvd UPDATE about 10.10.10.1/32 — DENIED due to: martian next-hop;
Start exabgp:
env exabgp.daemon.user=root exabgp.daemon.daemonize=true exabgp.daemon.pid=/var/run/exabgp.pid exabgp.log.destination=/var/log/exabgp.log exabgp /etc/exabgp_blackhole.conf
We recommend opening the log file and looking at it:
tail -f /var/log/exabgp.log exabgp
Now we will install Quagga.
Install package:
apt-get install -y quagga
Enable BGP daemon in Quagga:
vim /etc/quagga/daemons
And change the following lines:
zebra=yes bgpd=yes
Then you should create config files and fix permissions for them:
touch /etc/quagga/zebra.conf touch /etc/quagga/bgpd.conf touch /etc/quagga/quagga.conf chown quagga:quagga /etc/quagga/bgpd.conf chown quagga:quagga /etc/quagga/zebra.conf chown quagga:quagga /etc/quagga/quagga.conf
Create BGP configuration:
vi /etc/quagga/bgpd.conf
Example for configuration (please be aware! It’s not suitable for production):
hostname SoftBGP password zebra987 enable password zebra987 log file /var/log/quagga/bgpd.log debug bgp events debug bgp filters debug bgp fsm debug bgp keepalives debug bgp updates router bgp 1234 bgp router-id 10.0.3.115 bgp log-neighbor-changes neighbor 10.0.3.114 remote-as 65001
Apply configuration:
/etc/init.d/quagga restart
Success! We see this announce in Quagga:
/usr/bin/vtysh -d bgpd -c "show ip bgp summary" BGP router identifier 10.0.3.115, local AS number 1234 RIB entries 1, using 112 bytes of memory Peers 1, using 4568 bytes of memory Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.0.3.114 4 65001 12 18 0 0 0 00:01:12 1 Total number of neighbors 1
Check announced subnets from exabgp:
/usr/bin/vtysh -d bgpd -c "show ip bgp"
BGP table version is 0, local router ID is 10.0.3.115
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.10.10.1/32 10.0.3.114 0 65001 i
Total number of prefixes 1
This guide was prepared from a more detailed and complex article: https://www.m00nie.com/2014/01/bgp-rtbh-setup-using-exabgp/