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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 38 Configuring IP Unicast Routing
Configuring Protocol-Independent Features
Even though the router automatically learns about and configures equal-cost routes, 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 hardware will never use more than
16 paths per route.
Beginning in privileged EXEC mode, follow these steps to change the maximum number of parallel
paths installed in a routing table from the default:
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 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:
Use the no ip route prefix mask {address | interface} global configuration command to remove a static
route.
The switch retains static routes until you remove them. However, you can override static routes with
dynamic routing information by assigning administrative distance values. Each dynamic routing
protocol has a default administrative distance, as listed in Table 38-14. If you want a static route to be
overridden by information from a dynamic routing protocol, set the administrative distance of the static
route higher than that of the dynamic protocol.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
router {bgp | rip | ospf | eigrp} Enter router configuration mode.
Step 3
maximum-paths maximum 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.
Step 4
end Return to privileged EXEC mode.
Step 5
show ip protocols Verify the setting in the Maximum path field.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip route prefix mask {address | interface} [distance] Establish a static route.
Step 3
end Return to privileged EXEC mode.
Step 4
show ip route Display the current state of the routing table to verify
the configuration.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.