Hello,
AshvinO wrote:Hi,
I believe altering AS-PATH pre-pend for 203.223.191.0/24 could also achieve this
Not always - i.e. may not work for traffic coming from within ISP-1 itself.
For instance, if You read the NTT peering policy, they give customers LP==120 by default - it means AS_PATH prepending won't work for traffic coming from other NTT customers UNLESS ISP-2 is also NTT!
Deaggregation is the only reliable way barring LP decrease by way of community.
HTH
Thx
Alex