multihoming BGP with load balancing (agreegation)

RouterOS Forwarding Protocols
1

Hi,

I have Internet Bandwidth from two providers ( 10Mbps & 4 Mbps). I have my own IP block of /21 which I want to advertise
using BGP. Also I want to do load balancing between this 2 links (so that I will get total 14 Mbps to use). My RouterOS is
2.9.27. I have implemented BGP peering successfully with both the providers, but couldn’t do load balancing between two links.
When I run traceroute my packets go from one link always.

Please suggest some solution.

2

I believe that BGP is not Load Balancing and will never be…is just the shortest route. I’m wrong?

3

Then what is the best solution to use my IP block over internet and do aggregation of links.

4

2.9.27 isn’t supported on the forums, you must upgrade if you want any help.

5

to help you, we need to know your networks.
however, in a similar scenario, i think to:

  • announce your /21 on 10 mbps peer
  • announce your /21 on 4 mbps peer prepending your AS# 1 time
  • set default local pref on 10 mbps peer
  • set a low local pref on 4 mbps peer
  • if supported from 4 mbps peer, set a default local pref on 4 mbps peer for BGP communities that belong to 4 mbps peer.

in this way:

  • you use 10 mbps for almost download
  • you use 4 mbps for backup download / as with a short path
  • you use 10 mbps for upload
  • you use 4 mbps peer for upload to 4 mbps peer classes and customer classes.

Another way can be to split the /21 into 4 /23 and:

  • announce on 10 mbps peer the aggregated /21 + the first 3 /23
  • announce on 4 mbps the aggregated /21 + the last one /23.

In this way backup capability is ok, (aggregated /21), but the first 3 /23 will download from 10 mbps, the last one from the 4 mbps.

Try to change empirically the subnet announced on 4 mbps peer to balance in a good way.

in this scenario the first solution is very simple, but the 4 mbps will be used only a bit.
the second scenario can fullfill the 4 mbps but if a customer or more then one need >4mbps you are fucked :frowning:

bye!

Michele Pietravalle

6

Mikrotik will not support pirated software versions.. eg: 2.9.27
If you can afford a 10mbps link and a 4mbps link you can also afford the incredibly cheap price for a router license.

7

I have taken licensed copy of routeros. But my harddisk got crashed and hence i’m using this version.

8

we trust you. anyway, 2.9.27 is old and unsupported version =)

9

(offtopic)
I have 2.9.24(l4) licensed version that is still working on a Pentium I 133Mhz beast :slight_smile:
(ontopic)
If you can setup OSPF with your providers it will be a lot easier to do load balancing based on bandwidth constants.

10

let me guess. providers WON’T setup OSPF for him