See VPRN services command reference for CLI syntax to configure VPRN parameters.
*A:ALA-1>config>service# info
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...
vprn 1 customer 1 create
vrf-import "vrfImpPolCust1"
vrf-export "vrfExpPolCust1"
autonomous-system 10000
route-distinguisher 10001:1
exit
no shutdown
exit
...
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*A:ALA-1>config>service#