ISP A asked me which 2 ARIN class C's I wanted to advertise. I told them
xxx.yyy.216.0 and xxx.yyy.217.0. Then they came back and said, did you want
us to announce the 2 /24's or the /23?
I thought, isn't this up to me? I'm the one who configures it on my end.
For example, I can use the aggregate command if I want to advertise the /23,
and I can leave out the aggregate command if I want to advertise the 2
/24's.
router bgp zzz
network xxx.yyy.216.0 {advertise the Class C address to the Internet}
network xxx.yyy.217.0 {advertise the Class C address to the Internet}
!
aggregate-address xxx.216.0.0 255.255.254.0 summary-only {send the summary
route/aggregate route vs. individual routes}
I figure it's best to use the aggregate command to keep the ISP/Internet
routing tables down. Is this good strategy to use the above config when I
do the multihoming/backup/load share thing (have another router configured
exactly the same way, but to ISP B?
Jennifer L. Mellone
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