Alteon Application Switch Operating System Application Guide
Basic IP Routing
Document ID: RDWR-ALOS-V2900_AG1302
119
Gratuitous ARP (GARP) Command
Gratuitous ARP packets are used to force a next-hop router to learn an IP and MAC pair. For security
reasons, this command can only be used for an IP address belonging to a VIP, PIP, or interface.
Use the GARP command as follows:
Static Routes
Alteon has two basic mechanisms for learning networking routes:
•
Dynamic routes—The primary mechanism is through the use of routing protocols like the
Routing Information Protocol (RIP) and Open Shortest Path First (OSPF) protocol. Routes
learned in this manner are often referred to as dynamic routes because they are updated
periodically by the routing protocols to reflect the current conditions in the network. For more
information on these protocols and their use, see
Routing Information Protocol, page 121
and
Open Shortest Path First (OSPF), page 137
•
Static routes—Alteon also learns networking routes through static routes. Static routes are
manually entered into Alteon by an administrator. Although whole networks could be built upon
static routes, they do not have the capacity to change without user intervention and therefore
do not adequately represent the ever-changing reality of an enterprise network. It is because of
this that static routes have an important but limited role in the enterprise network. Typically,
static routes are used in situations when a protocol like RIP or OSPF cannot provide the
information necessary to create connectivity between two nodes.
For example, a node in a network that is running OSPF may need to know the route to a node in
a network that is not running OSPF. OSPF would not provide information about either network to
its counterpart. In this situation, a static route should be used to provide connectivity.
Alteon supports both IPv4 and IPv6 static routes through the Layer 3 Configuration menu. Up to
128 IPv4 and 128 IPv6 static routes are supported.
IPv4 Static Routes
IPv4 static routes are used to support static connectivity to an IPv4 network.
To add an IPv4 static route
Note:
When adding an IPv4 static route, in most cases you do not have to specify an interface
number. However, if you are using Firewall Load Balancing (FWLB) and you define two IP interfaces
on the same subnet, where one IP interface has a subnet of the host which is also included in the
subnet of the second interface, you must specify the interface.
>> Main#/oper/ip/garp <IP Address> <VLAN Number>
>> Main#/cfg/l3/route/ip4/add <destination> <mask> <gateway> [interface number]
