Configure IP routing and forwarding Supported routes
Digi TransPort WR Routers User Guide 363
TransPort routing mode
When you enable the TransPort routing mode, CIDR routing is disabled. When the router receives an
IP packet to route, it uses the routing table to decide through which interface to send the packet.
Usually the destination IP address of the IP packet is compared with the IP Address and Mask of
each entry in the routing table in index order, regardless of the order in the routing table or length of
mask. There may be more than one match, and in this case, the index number of the route is taken
into account. The index number is simply the route number in the configuration. That is, Static
Route 0 or 1 is index 0 or 1.
The router checks static routes first, then dynamic routes, then default routes.
CLI command:
ip 0 cidr off
CIDR routing mode
When the router receives an IP packet to route, it uses the routing table to decide through which
interface to send the packet. Usually the destination IP address of the IP packet is compared with
the IP Address and Mask of each entry in the routing table. There may be more than one match and
in this case the router uses the most specific route to route the packet. For example, a the router
uses a matching /24 route before a matching /16 route.
If multiple routes match the destination and have the same prefix length, the router uses the index
number of the routes in the routing table to determine the route.
CLI command: ip 0 cidr on
Route metrics
You can set route metric settings to override the order in which the routes are searched. The router
always uses routes with lower metric numbers in preference to routes with higher metric numbers,
even if the routes with higher metric numbers appear first in the routing table.
To configure route metrics, use the following route parameters:
▪ Connected Metric
▪ Disconnected Metric
You can alter route metrics automatically according to various circumstances. This allows for
automatic backup connection paths.
You can put routes and interfaces out of service. Whenever an interface is out of service (OOS), any
route pointing at the interface is also out of service. Whenever a route is out of service, the metric
value is set to 16 in TransPort routing mode and 17 in CIDR mode.
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