Configuring The Number Of Equal-Cost Routing Paths; Configuring Static Unicast Routes - Cisco WS-CBS3032-DEL Software Configuration Manual

Chapter 39 Configuring IP Unicast Routing
Command
Step 9
show adjacency
Step 10
copy running-config startup-config

Configuring the Number of Equal-Cost Routing Paths

When a router has two or more routes to the same network with the same metrics, these routes can be
thought of as having an equal cost. A parallel path provides another way to see occurrences of equal-cost
routes in an IP routing table. A router with two or more equal-cost paths to a network can use them
concurrently. Parallel paths provide redundancy in case of a circuit failure and also enable a router to
load balance packets for more efficient use of available bandwidth. Equal-cost routes are supported
across switches in a stack.
The router automatically learns about and configures equal-cost routes, but you can control the
maximum number of parallel paths supported by an IP routing protocol in its routing table. Although the
switch software allows a maximum of 32 equal-cost routes, the switch never uses more than 16 paths per
route.
Beginning in privileged EXEC mode, follow these steps to change the maximum number of parallel
paths in a routing table from the default:
Command
Step 1 configure terminal
Step 2 router {bgp | rip | ospf | eigrp}
Step 3
maximum-paths maximum
Step 4 end
Step 5
show ip protocols
Step 6 copy running-config startup-config
Use the no maximum-paths router configuration command to restore the default value.

Configuring Static Unicast Routes

Static unicast routes are user-defined routes that cause packets moving between a source and a
destination to take a specified path. Static routes can be important if the router cannot dynamically build
a route to a particular destination and are useful for specifying a gateway of last resort to which all
unroutable packets are sent.
Beginning in privileged EXEC mode, follow these steps to configure a static route:
Command
Step 1 configure terminal
Step 2
ip route prefix mask {address | interface} [distance]
OL-13270-06
Purpose
Display CEF adjacency table information.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enter router configuration mode.
A switch running the IP base feature set supports only the rip keyword.
Set the maximum number of parallel paths for the protocol routing
table. The range is from 1 to 16; the default is 4 for most IP routing
protocols, but only 1 for BGP.
Return to privileged EXEC mode.
Verify the setting in the Maximum path field.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Establish a static route.
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
Configuring Protocol-Independent Features
39-97