or you can do tis: / routing filter
add action=accept chain=isp1-out prefix=192.168.48.0/20 add action=accept chain=isp1-out prefix=192.168.50.0/23 set-bgp-prepend=5 add action=accept chain=isp1-out prefix=192.168.52.0/23 set-bgp-prepend=5 add action=discard chain=isp1-out prefix=0.0.0.0/0 prefix-lenght=0-32 On 27/12/2013 19:45, Keith Barber wrote:
Those will only announce just those 3 subnets. If you have smaller subnets that you're advertising, you can use the 'prefix-length' field. Adjust the length depending on how large or small your advertisements are. /routing filter add action=accept chain=isp1-out prefix=192.168.50.0/23 set-bgp-prepend=5 add action=accept chain=isp1-out prefix=192.168.52.0/23 set-bgp-prepend=5 add action=accept chain=isp1-out prefix=192.168.48.0/20 prefix-length=20-23 add chain=isp1-out action=discard -Keith- ----- Original Message ----- From: "Terri Kelley" <net...@farm-market.net> To: "Mikrotik discussions" <Mikrotik@mail.butchevans.com> Sent: Friday, December 27, 2013 5:25:12 PM Subject: [Mikrotik] bgp prepend Been too long since I've done any of this and haven't in RouterOS. I'm wanting to load balance incoming traffic to my bgp edge from two fiber connections. So my thought was to prepend the subnets of my /20 that I want to come in from the other upstream, say ISP2. ISP1 is always heavier use. Seems in cisco that you could advertise the whole /20 and then just put the couple of prepended subnets that you wanted rather than having to break down all of it. Is that correct? If that is the case it would look something like this in RouterOS… /routing filter add action=accept chain=isp1-out prefix=192.168.48.0/20 add action=accept chain=isp1-out prefix=192.168.50.0/23 set-bgp-prepend=5 add action=accept chain=isp1-out prefix=192.168.52.0/23 set-bgp-prepend=5 add chain=isp1-out action=discard add action=accept chain=isp2-out prefix=192.168.48.0/20 add chain=isp2-out discard That should put the 50.0/23 and 52.0/23 over on isp2 and allow everything else to choose which side. Or do I have to list all of the subnets prepended and not? Terri Kelley Network Engineer 254-697-6710 Farm to Market Broadband -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.butchevans.com/pipermail/mikrotik/attachments/20131227/b9084a4b/attachment.html> _______________________________________________ Mikrotik mailing list Mikrotik@mail.butchevans.com http://mail.butchevans.com/mailman/listinfo/mikrotik Visit http://blog.butchevans.com/ for tutorials related to Mikrotik RouterOS _______________________________________________ Mikrotik mailing list Mikrotik@mail.butchevans.com http://mail.butchevans.com/mailman/listinfo/mikrotik Visit http://blog.butchevans.com/ for tutorials related to Mikrotik RouterOS
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