====== BGP Replay Tool ======


Used to test BGP Route Receiver that ships with Trisul.


===== 1. Download BRT =====
 

You can find it here http://caia.swin.edu.au/tools/bgp/brt/downloads.html


<note important>

**Error with mp_ methods** 

There seems to be an issue with the Net::BGP module.

We are getting the following error with version 0.2  ''Can't locate object method "mp_unreach_nlri" via package "Net::BGP::Update" at brt-0.2.pl line 263, <$fh> line 2.''

As a hack you can comment out the mp_unreach_nlri and mp_reach_nlri , you will lose the multipath updates.  


</note>



===== 2. Install the Perl Net::BGP module =====


<code>
sudo cpanm Net::BGP
</code>

===== 3. On router under test =====
 
Add the BRT as a peer say with AS 300

Lets say the router has an  AS 400

<code>
sh bgp neighbors
debug ip bgp all
conf t
router bgp 400
neighbor 192.168.3.100  remote-as 300

</code>


===== 4. Prepare a route update file =====
 

Download a route update file in MRT format. The easiest way is to download from a collector see http://archive.routeviews.org/


==== 4.1 Convert the MRT format update file to a format acceptable by brt using bgpdump ====


BRT tool needs a human readable BGP update file
''
 BGP update file in human readable with Unix format (bgpdump -m option)

''

Convert the file using bgpdump

<code>
bgpdump -m updates.20191101.0130  > updates.20191101.0130.bgpdump
</code>



===== 5. Now you can inject routes into the router table. =====


Run BRT , use the -v to keep an eye on errors. 

<code>
sudo perl brt-0.2.pl  -brtas 300 -brtip 192.168.3.33 -peeras 400 -peerip 192.168.3.200 -f ~/updates.20191101.0130.bgpdump -v
</code>


Use the following command on the router

<code>

sh ip route
sh bgp summ
sh bgp neighbors

</code>



BRT is a useful tool to test Trisul ISP (needs license)