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- Routes are subsequently assigned a metric equal to the sum of all
metrics for each interface link in the route.
• Authentication Type – Specifies the authentication type used for an
interface. (Options: None, Simple password, MD5; Default: None)
- Use authentication to prevent routers from inadvertently joining
an unauthorized area. Configure routers in the same area with the
same password or key.
- When using simple password authentication, a password is
included in the packet. If it does not match the password
configured on the receiving router, the packet is discarded. This
method provides very little security as it is possible to learn the
authentication key by snooping on routing protocol packets.
- When using Message-Digest 5 (MD5) authentication, the router
uses the MD5 algorithm to verify data integrity by creating a
128-bit message digest from the authentication key. Without the
proper key and key-id, it is nearly impossible to produce any
message that matches the prespecified target message digest.
- The Authentication Key and Message Digest Key-id must be used
consistently throughout the autonomous system. (Note that the
Message Digest Key-id field is disabled when this authentication
type is selected.)
• Authentication Key – Assign a plain-text password used by
neighboring routers to verify the authenticity of routing protocol
messages. (Range: 1-8 characters for simple password or 1-16
characters for MD5 authentication; Default: no key)
- You can assign a unique password to each network (i.e.,
autonomous system) to improve the security of the routing
database. However, the password must be used consistently on all
neighboring routers throughout a network.
• Message Digest Key-id – Assigns a key-id used in conjunction with
the authentication key to verify the authenticity of routing protocol
messages sent to neighboring routers. (Range: 1-255; Default: none)