IP Routing Commands
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propagation delays. LSAs have their age incremented by this amount
before transmission. This value must be the same for all routers attached
to an autonomous system. (Range: 1-3600 seconds; Default: 1 seconds)
•dead-interval seconds - Specifies the time that neighbor routers will wait
for a hello packet before they declare the router down. This value must be
the same for all routers attached to an autonomous system.
(Range: 1-65535 seconds; Default: 4 x hello interval, or 40 seconds)
•authentication-key key - Sets a plain text password (up to 8 characters)
that is used by neighboring routers on a virtual link to generate or verify the
authentication field in protocol message headers. A separate password can
be assigned to each network interface. However, this key mus t be the same
for all neighboring routers on the same network (i.e., autonomous syste m).
This key is only used when authentication is enabled for the backbone.
•message-digest-key key-id md5 key - Sets the key identifier and
password to be used to authenticate protocol messages passed between
neighboring routers and this router when using message digest (MD5)
authentication. The key-id is an integer from 1-255, and the key is an
alphanumeric string up to 16 characters long. If MD5 authentication is used
on a virtual link, then it must be enabled on all routers within an autonomous
system; and the key identifier and key must also be the sam e for all routers.
Command Mode
Router Configuration
Default Setting
area-id: None
router-id: None
hello-interval: 10 seconds
retransmit-interval: 5 seconds
transmit-delay: 1 second
dead-interval: 40 seconds
authentication-key: None
message-digest-key: None
Command Usage
• All areas must be connected to a backbone area (0.0.0.0) to maintain routing
connectivity throughout the autonomous system. If it not p ossible to physically
connect an area to the backbone, you can use a virtual link. A v irtual link can
provide a logical path to the backbone for an isolated area. You can specify
up to 32 virtual links on this router.
• Any area disconnected from the backbone must incl ude the transit area ID
and the router ID for a virtual link neighbor that is adjacent to the backbone.
• This router supports up 64 virtual links.