no area-password [password]
Password you assign.
To configure the IS-IS area authentication password, use the area-password command in router configuration mode. To disable the password, use the no form of this command.
By default, no area password is defined, and area password authentication is disabled.
Using the area-password command on all routers in an area will prevent unauthorized routers from injecting false routing information into the link-state database.
This password is exchanged as plain text and thus this feature provides only limited security.
This password is inserted in Level 1 (station router level) protocol data unit (PDU) link-state packets (LSPs), complete sequence number PDUs (CSNPs), and partial sequence number PDUs (PSNP).
The following example assigns an area authentication password:Router(config-router)# area-password angel
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