Enables or disables simple text authentication
or HMAC MD5 authentication of IS-IS level 2 CSNP packets or PSNP packets.
The no version restores the default behavior,
in which authentication of IS-IS level 2 CSNPs and PSNPs is disabled.
Options
csnp—Enables authentication of IS-IS level 2 complete
sequence number PDUs (CSNPs)
psnp—Enables authentication of IS-IS level 2 partial
sequence number PDUs (PSNPs)