Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 70)

52 Brocade ICX 6650 Layer 3 Routing Configuration Guide
53-1002603-01
Configuring IP parameters – Layer 3 Switches
FIGURE 5 Standard and null static routes to the same destination network
Figure 6 shows another example of two static routes. In this example, a standard static route and
an interface-based static route are configured for destination network 192.168.6.0/24. The
interface-based static route has a lower metric than the standard static route. As a result, the Layer
3 Switch always prefers the interface-based route when the route is available. However, if the
interface-based route becomes unavailable, the Layer 3 Switch still forwards the traffic toward the
destination using an alternate route through gateway 192.168.8.11/24.
X
Two static routes to 192.168.7.0/24:
--Standard static route through
gateway 192.168.6.157, with metric 1
--Null route, with metric 2
Switch A
Switch A
Switch B
Switch B
192.168.6.188/24 192.168.6.157/24 192.168.7.7/24
192.168.7.69/24
When standard static route
is good, Switch A uses that
route.
192.168.6.188/24 192.168.6.157/24 192.168.7.7/24
192.168.7.69/24
If standard static route is
unavailable, Switch A uses
the null route (in effect dropping
instead of forwarding the packets).
Null