01-08-2013 06:03 AM - edited 03-04-2019 06:37 PM
Hello everyone and happy new year
This question is in some way related to https://supportforums.cisco.com/message/3806616
Imagine AS65200 anouncing block 10.10.0.0/22 to the internet.
Now for some reason we need to announce block 10.10.2.0/24 from AS65333.
How should routes from AS65200 be announced now?
Thanks all
Mario
10.10.10.0/22 (AS65200) |
10.10.10.0/23 (AS65200) |
10.10.2.0/24 (AS65333) |
10.10.3.0/24 (AS65200) |
01-08-2013 06:27 AM
As you stated, the /24 is more specific and traffic going to that subnet will use AS 65333
Other subnets from the /22 will use AS 65200
Regards,
01-08-2013 09:08 PM
Mario,
If you are peering with the same upstream, you can advertise the whole /22 via AS65200 and only advertise a /24 via AS65333. The /24 is more prefered at all times until your link goes down.
If you peer with more then one upstream, that you will need to make some fun changes...
01-10-2013 07:24 AM
Ahad,
We are from completely different upstream (different continents even) what are these fun changes?
Mario
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