Consider if BGP is the way to go with redundancy - maybe <cough> DNS is a better way to steer traffic as you can, using a bunch of services out there, do live-ness testing of end points etc.
On Tue, 2 May 2023 at 08:35, Steven Waite <[email protected]> wrote: > Thank you for everyone's replies as this has given me a solution. Love the > Ausnog community:) > > I will try again and reach out to our up stream carriers. Basically we > are multi-homed with our primary site active with the second site as > secondary to carry selective traffic and redundancy. This was manly to get > around slow routing changes and also eliminating a risk of asymmetrical > routing due to session based firewalls been in the mix. > > > On 2 May 2023, at 8:50 am, Matthew Moyle-Croft <[email protected]> wrote: > > > Have to remember some BGP basics: > > 1) longest prefix (eg. /24 in your case) will always win. > 2) localpref will always win when comparing identical prefixes. > 3) A network will always use localpref to prefer directly connected > customer routes. > 4) ASPath length is not going to overcome the above. > > What does "failover" mean to you? When there's a failure, look at what > Vocus and TPG have in their route tables and the timing. Also check, are > you actually withdrawing the routes during failure? > > MMC > > On Mon, 1 May 2023 at 18:09, Steven Waite <[email protected]> wrote: > >> Good evening >> >> I hope everyone is well. We have a /23 block broken up between TPG /24 >> and Vocus /24 with the /23 advertise to both Vocus and TPG for failover. >> This worked will until recently as we noticed increasing failover times >> during maintenance and now takes around 10-15 minutes. Today I decided to >> try AS path prepending away from smallest prefix wins type of approach. I >> think Vocus and TPG ignores prepending as these are local routes thus the >> local route is preferred even with a lot of prepends. I would love to >> achieve the same thing via communities if it’s possible. Is someone able to >> share communities numbers that I should be using for Vocus/TPG please to >> advertise the primary route for a prefix? >> >> Many thanks Steve >> _______________________________________________ >> AusNOG mailing list >> [email protected] >> https://lists.ausnog.net/mailman/listinfo/ausnog >> >
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