Dell BigIron RX Series, Руководство по настройке

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BigIron RX Series Configuration Guide 199
53-1002253-01
Configuring forwarding parameters
7
Static route types
You can configure the following types of static IP routes:
•
Standard – the static route consists of the destination network address and network mask,
and the IP address of the next-hop gateway. You can configure multiple standard static routes
with the same metric for load sharing or with different metrics to provide a primary route and
backup routes.
•
Interface-based – the static route consists of the destination network address and network
mask, and the device interface through which you want the device to send traffic for the route.
Typically, this type of static route is for directly attached destination networks.
•
Null – the static route consists of the destination network address and network mask, and the
“null0” parameter. Typically, the null route is configured as a backup route for discarding traffic
if the primary route is unavailable.
Static IP route parameters
When you configure a static IP route, you must specify the following parameters:
•
The IP address and network mask for the route’s destination network.
•
The route’s path, which can be one of the following:
•
The IP address of a next-hop gateway
•
An Ethernet port
•
A virtual interface (a routing interface used by VLANs for routing Layer 3 protocol traffic
among one another)
•
A “null” interface. The device drops traffic forwarded to the null interface.
The following parameters are optional:
•
The route’s metric – The value the device uses when comparing this route to other routes in
the IP route table to the same destination. The metric applies only to routes that the device has
already placed in the IP route table. The default metric for static IP routes is 1.
•
The route’s administrative distance – The value that the device uses to compare this route with
routes from other route sources to the same destination before placing a route in the IP route
table. This parameter does not apply to routes that are already in the IP route table. The default
administrative distance for static IP routes is 1.
The default metric and administrative distance values ensure that the device always prefers static
IP routes over routes from other sources to the same destination.
Multiple static routes to the same destination provide load sharing
and redundancy
You can add multiple static routes for the same destination network to provide one or more of the
following benefits:
•
IP load balancing – When you add multiple IP static routes for the same destination to different
next-hop gateways, and the routes each have the same metric and administrative distance, the
device can load balance traffic to the routes’ destination. For information about IP load
balancing, refer to
“Configuring IP load sharing” on page 209.