D-Link DWS-1008, Руководство по эксплуатации продукта

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D-Link DWS-1008 User Manual
Configuring and Managing IP Routes
The IP route table contains routes that MSS uses for determining the interfaces for a switch’s external
communications. When you add an IP interface to a VLAN that is up, MSS automatically adds
corresponding entries to the IP route table.
For destination routes that are not directly attached, you can add static routes. A static route specifies
the destination and the default router through which to forward traffic.You can add the following types
of static routes:
Explicit route - Forwarding path for traffic to a specific destination
Default route - Forwarding path for traffic to a destination without an explicit route in the route table
A destination can be a subnet or network. If two static routes specify a destination, the more specific
route is always chosen (longest prefix match). For example, if you have a static route with a destination
of 10.10.1.0/24, and another static route with a destination of 10.10.0.0/16, the first static route is
chosen to reach 10.10.1.15, because it has the longer prefix match.
If the IP route table contains an explicit route for a given destination, MSS uses the route. Otherwise,
MSS uses a default route. For example, if the route table does not have a route to host 192.168.1.10,
the switch uses the default route to forward a packet addressed to that host. D-Link recommends that
you configure at least one default route.
You can configure a maximum of four routes per destination. This includes default routes, which have
destination 0.0.0.0/0. Each route to a given destination must have a unique gateway address. When the
route table contains multiple default routes or multiple explicit routes to the same destination, MSS uses
the route with the lowest metric (cost for using the route). If two or more routes to the same destination
have the lowest cost, MSS selects the first route in the route table.
MSS can use a route only if the route is resolved by a direct route on one of the switch’s VLANs.
Note: Before you add a static route, use the show interface command to verify that the switch has
an IP interface in the same subnet as the route’s default router (gateway). MSS requires the routes for
the interface to resolve the static route. If the switch does not have an interface in the default router’s
subnet, the static route cannot be resolved and the VLAN:Interface field of the
show ip route command
output shows that the static route is down.