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ChanukaD
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Maximum amount of BGP routes in MikroTik routes

Mon Feb 17, 2020 6:31 am

Hi Guys,

Our ISP network is expanding to another region and we are planning to use MikroTik routers as route reflector servers. In our current setup we have a MikroTik CCR1072 which holds around 1.7 Million BGP routes. ( Two tables of full internet routing table ). Upon expansion of our network we will have new upstream partners and peering which will extend the amount of routes which needs to hold by MikroTik routers.

In current production we are using 2 Cisco ISR4451 as route reflectors with 16GB of memory each and it has 1.8 Million routes in its table. I have email to MikroTik support to know more about this and they have revert back with a documentation which contains some info about it.

https://wiki.mikrotik.com/wiki/Manual:B ... e_table.3F

As per the documentation to have 300,000 routes it requires 256 MB of RAM. According to this fact to have one copy of full internet routing now it requires 768 MB of RAM since amount of routes has exceeded 800,000. ( This is my calculation actually ). If this calculation is correct MikroTik 1036 and CCR 1072 should be able to hold 8.5 million and 17 million routes respectively.

I would to know your experience, thoughts and recommendations about this guys. Please share with me your comments.


Cheers.
Chanu.
 
savage
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Re: Maximum amount of BGP routes in MikroTik routes

Mon Feb 17, 2020 8:47 am

It will hold the routes with minimal memory - that's not the problem.

Changing the routes in the actual routing table, will take 5+ minutes however. It learns the routes via BGP fairly quickly, but it updates, -notoriously- slowly. Failing over a full table (880K+ routes) will take you 30 minutes, easy.
 
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Re: Maximum amount of BGP routes in MikroTik routes

Mon Feb 17, 2020 3:43 pm

The CCRs will be too slow until RouterOSv7 is out as a stable option with BGP. The example below is 17 minutes of convergence on CCRs.

Here are some examples of convergence time for CCR vs. CHR using Free Range Routing as the RR. The full presentation from MUM US 2019 is here:

PDF
https://mum.mikrotik.com/presentations/ ... 447941.pdf

Video
https://www.youtube.com/watch?v=tNjIgo8 ... =emb_title


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