CLI Reference Guide

Configuring IP Services 227
For destination routes that are not directly attached, you can add static
routes. A static route specifies the destination and the gateway 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
If the IP routing table contains an explicit route for a given destination,
MSS uses the route. Otherwise, MSS uses a default route. For example, if
the routing table does not have a route to host 192.168.1.10, the WX
uses the default route to forward a packet addressed to that host. 3Com
recommends that you configure at least one default route.
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.
Creating Static Routes
You can configure a maximum of four routes per destination. This
includes default routes, which have a destination of 0.0.0.0/0. Each route
to a given destination must have a unique gateway address. When the
routing 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 routing table.
When you add multiple routes to the same destination, MSS groups the
routes together and orders them from lowest metric at the top of the
group to highest metric at the bottom of the group. If you add a new
route with the same destination and metric as a route already in the
table, MSS places the new route at the top of the group of routes with
the same metric.
MSS can use a route only if the route is resolved through an IP interface
on one of VLANs on the WX switch.