- Bronze, 100 points or more
Network Design: We are using BGP with two ISP peers, and we are using AS Path prepending to somewhat control how traffic comes into our network.
Problem: For the most part AS path prepending is working as intended, but in some cases some networks ingress from the non-preferred ISP. There is one network in particular that we would really like to ingress through a particular ISP.
Proposed Solution: I am thinking of advertising this network to both ISPs, but with different subnet masks. Right now we are advertising the network with 24 bit mask to both ISPs. And I would like to advertise this network to the "non preferred" ISP with a 23 bit mask.
Any advise or suggestions?
you should be fine if the whole /23 block is under your control (if the company owns it as a whole).
Clearly ip addresses will be only on the most specific /24 space.
A /24 should be seen in the internet and as most specific route should be preferred
Hope to help