Introduction; Static Route; Default Route - 3Com MSR 50 Series Configuration Manual

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Introduction

Static Route

Default Route

S R
TATIC OUTING
When configuring a static route, go to the following sections for information you
are interested in:
"Introduction" on page 1007
■
"Configuring a Static Route" on page 1008
■
"Detecting Reachability of the Static Route's Nexthop" on page 1009
■
"Displaying and Maintaining Static Routes" on page 1010
■
"Configuration Example" on page 1010
■
A static route is a special route that is manually configured by the network
administrator. If a network's topology is simple, you only need to configure static
routes for network interconnection. The proper configuration and usage of static
routes can improve network performance and ensure bandwidth for important
network applications.
The disadvantage of using static routes is that they cannot adapt to network
topology changes. If a fault or a topological change occurs to the network, the
routes will be unavailable and the network breaks. In this case, the network
administrator has to modify the static routes manually.
A router selects the default route only when it cannot find any matching entry in
the routing table.
If the destination address of a packet fails to match any entry in the routing
■
table, the router selects the default route to forward the packet.
If there is no default route and the destination address of the packet fails to
■
match any entry in the routing table, the packet will be discarded and an ICMP
packet will be sent to the source to report that the destination or the network
is unreachable.
You can create the default route with both destination and mask being 0.0.0.0,
and some dynamic routing protocols, such as OSPF, RIP and IS-IS, can also
generate the default route.
C
ONFIGURATION