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Make note of Ben's extra aggregation trick

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Job Snijders
2021-08-19 16:02:03 +00:00
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Ben Maddison taught me another aggregation trick:
route-set: AS37271:RS-EXAMPLE
mp-members: 192.0.2.0/27
mp-members: 192.0.2.32/27
mp-members: 192.0.2.64/27
mp-members: 192.0.2.96/27
mp-members: 192.0.2.128/26
mp-members: 192.0.2.128/27
mp-members: 192.0.2.160/27
mp-members: 192.0.2.192/27
mp-members: 192.0.2.224/27
descr: Example route-set
mnt-by: MAINT-AS37271
changed: benm@workonline.africa 20210819
source: RADB
BGPQ4 produces the following:
$ bgpq4 -A AS37271:RS-EXAMPLE
no ip prefix-list NN
ip prefix-list NN permit 192.0.2.0/25 ge 27 le 27
ip prefix-list NN permit 192.0.2.128/26 le 27
ip prefix-list NN permit 192.0.2.192/26 ge 27 le 27
But the following aggregation also is valid, and shorter:
ip prefix-list NN permit 192.0.2.0/24 ge 27 le 27
ip prefix-list NN permit 192.0.2.128/26