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Digi TransPort OSPF configuration file syntax 

DESCRIPTION
     OSPF on TransPort routers implements the Open Shortest Path First protocol
     version 2 as described in RFC 2328.  The following text is from the OpenBSD
     man page for ospfd.conf.  The SarOS operating system implementation of OSPF 
     is almost identical to the OpenBSD version but some of the features described 
     may not be supported.

SECTIONS
     The OSPF config file is divided into three main sections.

     Macros
           User-defined variables may be defined and used later, simplifying
           the configuration file.

     Global Configuration
           Global settings for OSPF.  A number of global settings can be
           overruled in specific areas or interfaces.

     Areas
           An OSPF router must be a member of at least one area.  Areas are
           used to group interfaces, simplifying configuration.

MACROS
     Macros can be defined that will later be expanded in context.  Macro
     names must start with a letter, digit, or underscore, and may contain any
     of those characters.  Macro names may not be reserved words (for example,
     area, interface, or hello-interval).  Macros are not expanded inside
     quotes.

     For example:

           hi="5"
           area 0.0.0.0 {
                   interface tun0 {
                           hello-interval $hi
                   }
           }

     The same can be accomplished by specifying the hello-interval globally or
     within the area declaration.

GLOBAL CONFIGURATION
     All interface related settings can be configured globally, per area and
     per interface.  The only settings that can be set globally and not
     overruled are listed below.

     fib-update (yes|no)
             If set to no, do not update the Forwarding Information Base,
             a.k.a. the kernel routing table.  The default is yes.  Setting
             fib-update to no will implicitly set the stub router option to
             ensure that no traffic tries to transit via this router.

     rdomain tableid
             Specifies the routing table OSPF should modify.  Table 0 is
             the default table.

     [no] redistribute (static|connected|default) [set ...]
     [no] redistribute prefix [set ...]
     [no] redistribute rtlabel label [set ...]
             If set to connected, routes to directly attached networks will be
             announced over OSPF.  If set to static, static routes will be
             announced over OSPF.  If set to default, a default route pointing
             to this router will be announced over OSPF.  It is possible to
             specify a network range with prefix; networks need to be part of
             that range to be redistributed.  Additionally it is possible to
             redistribute based on route labels using the rtlabel keyword.  By
             default no additional routes will be announced over OSPF.

             redistribute statements are evaluated in sequential order, from
             first to last.  The first matching rule decides if a route should
             be redistributed or not.  Matching rules starting with no will
             force the route to be not announced.  The only exception is
             default, which will be set no matter what, and additionally no
             cannot be used together with it.

             It is possible to set the route metric and type for each
             redistribute rule.  type is either 1 or 2.  The default value for
             type is 1 and for metric is 100.  Setting more than one option
             needs curly brackets:

                   redistribute static set { metric 300 type 2 }

     rfc1583compat (yes|no)
             If set to yes, decisions regarding AS-external routes are
             evaluated according to RFC 2328.  The default is no.

     router-id address
             Set the router ID; if not specified, the numerically lowest IP
             address of the router will be used.

     rtlabel label external-tag number
             Map route labels to external route tags and vice versa.  The
             external route tag is a non-negative 32-bit number attached to
             AS-external OSPF LSAs.

     spf-delay (seconds|msec milliseconds)
             Set the SPF delay.  The delay between receiving an update to the
             link state database and starting the shortest path first
             calculation.  The default value is 1 second; valid range is 10
             milliseconds-10 seconds.

     spf-holdtime (seconds|msec milliseconds)
             Set the SPF holdtime.  The minimum time between two consecutive
             shortest path first calculations.  The default value is 5
             seconds; the valid range is 10 milliseconds-5 seconds.

     stub router (yes|no)
             If set to yes, all interfaces with active neighbors will have a
             metric of infinity.  This ensures that the other routers prefer
             routes around this router while still being able to reach
             directly connected IP prefixes. 

AREAS
     Areas are used for grouping interfaces.  All interface-specific
     parameters can be configured per area, overruling the global settings.

     area address
             Specify an area section, grouping one or more interfaces.

                   area 0.0.0.0 {
                           interface tun0
                           interface tun1 {
                                   metric 10
                           }
                   }

     Area specific parameters are listed below.

     demote group [count]
             Increase the demotion counter by [count] on the given
             interface group, when no neighbor in the area is in
             an active state.  The demotion counter will be decreased when one
             neighbor in that area is in an active state.  The default value
             for count is 1.

     stub [redistribute default] [set ...]
             Mark the area as stub.  Stub areas will not be flooded by as-ext
             LSA, resulting in smaller routing tables.  Area border routers
             should redistribute a default network LSA; this can be enabled by
             specifying the default redistribute option.  A default summary
             LSA will only be redistributed if the router has an active
             connection to the backbone area 0.0.0.0.

INTERFACES
     Each interface can have several parameters configured individually,
     otherwise they are inherited.  An interface is specified by its name.  If
     multiple networks are configured an additional IP address can be
     supplied.  By default the first IP address is used.

           interface tun0 {
                   auth-type crypt
                   auth-md 1 "yotVoo_Heypp"
                   auth-md-keyid 1
           }
           interface eth0:192.168.1.3

     Interface-specific parameters are listed below.

     auth-key key
             Set the authentication key for simple authentication.  Up to 8
             characters can be specified.

     auth-md key-id key
             Set the authentication key-id and key for crypt authentication.
             The valid range for key-id is 0-255.  Up to 16 characters can be
             specified for key.  Multiple keys may be specified.

     auth-md-keyid key-id
             Configure the key-id to use for crypt authentication.  The valid
             range for key-id is 0-255.  The default key-id is 1.  While key-
             id 0 is valid, it is unavailable on various other
             implementations.

     auth-type (none|simple|crypt)
             Set the authentication type.  The default is none.  Simple
             authentication uses a plaintext password, up to 8 characters.
             Crypt authentication uses an MD5 hash.

     demote group
             Increase the demotion counter by 1 on the given interface
             group, when the interface state is going down.  The
             demotion counter will be decreased when the interface state is
             active again.

     fast-hello-interval msec milliseconds
             If the interface is configured to use router-dead-time minimal,
             hello packets will be sent using this timer.  The default value
             is 333; valid range is 50-333 milliseconds.

     hello-interval seconds
             Set the hello interval.  The default value is 10; valid range is
             1-65535 seconds.

     metric cost
             Set the interface metric a.k.a. cost.  The default value is 10;
             valid range is 1-65535.

     passive
             Prevent transmission and reception of OSPF packets on this
             interface.  The specified interface will be announced as a stub
             network.

     retransmit-interval seconds
             Set retransmit interval.  The default value is 5 seconds; valid
             range is 5-3600 seconds.

     router-dead-time (seconds|minimal)
             Set the router dead time, a.k.a. neighbor inactivity timer.  The
             default value is 40 seconds; valid range is 2-2147483647 seconds.
             If the router dead time has been set to minimal, the timer is set
             to 1 second and hello packets are sent using the interval
             specified by fast-hello-interval.  When a neighbor has been
             inactive for router-dead-time its state is set to DOWN.
             Neighbors that have been inactive for more than 24 hours are
             completely removed.

     router-priority priority
             Set the router priority.  The default value is 1; valid range is
             0-255.  If set to 0 the router is not eligible as a Designated
             Router or Backup Designated Router.

     transmit-delay seconds
             Set the transmit delay.  The default value is 1; valid range is
             1-3600 seconds.

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