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File Extensions

Table 17 describes the file extensions that the ERX routers use for digital certificates that are created by the offline process.

During the online digital certificate process, the certificate files are kept in NVS in hidden areas and are not visible to users (the files do not appear when you enter a dir shell command). Use the show commands to display information for the online certificate files. The router's private keys are similarly hidden from users.

Table 17: File Extensions (Offline Configuration)

File Extension	Description
.crq	Used for certificate request files that are generated on the ERX router and taken to CAs for obtaining a certificate.
.cer	Used for public certificate files. The public certificates for root CAs and the router public certificates are copied to the ERX router. They are automatically recognized as belonging to the ERX router or CA by certificate subject name and issuer name (in a CA they are the same). The ERX router supports multiple CAs.
.crl	Used for certificate revocation lists that are obtained offline from CAs and copied to the ERX router. CRLs indicate which certificates from a particular CA are revoked.

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