Routing Policy Specification Language
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The Routing Policy Specification Language (RPSL) is a language used by ISPs to describe their routing policies. RPSL is used by various whois databases including the RIPE Whois Database. Using tools such as RtConfig it is possible to automatically generate router configuration files from RPSL registry entries.
RPSL is described in RFC 2622 and replaces RIPE-181.
RPSL has been extended with RPSL-NG (RPSL-Next Generation) effort to support IPv6 routing policies and multicast routing policies. RPSL-NG is defined in RFC 4012.