Configuring The Number Of Equal-Cost Routing Paths - Cisco 3750G - Catalyst Integrated Wireless LAN Controller Configuration Manual

Configuring Protocol-Independent Features
detail privileged EXEC command can be useful to debug software-forwarded traffic. To enable CEF on
an interface for the software-forwarding path, use the ip route-cache cef interface configuration
command.
Caution Although the no ip route-cache cef interface configuration command to disable CEF on an interface is
visible in the CLI, we strongly recommend that you do not disable dCEF on interfaces except for
debugging purposes.
Beginning in privileged EXEC mode, follow these steps to enable dCEF globally and on an interface for
software-forwarded traffic if it has been disabled:
Command
Step 1 configure terminal
Step 2 ip cef distributed
Step 3
interface interface-id
Step 4
ip route-cache cef
Step 5 end
Step 6 show ip cef
Step 7
show cef linecard [slot-number] [detail]
Step 8
show cef interface [interface-id]
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. The term parallel path is another way to see occurrences of equal-cost
routes in a routing table. If a router has two or more equal-cost paths to a network, it can use them
concurrently. Parallel paths provide redundancy in case of a circuit failure and also enable a router to
load balance packets over the available paths for more efficient use of available bandwidth. Equal-cost
routes are supported across switches in a stack.
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:
Catalyst 3750 Switch Software Configuration Guide
35-76
Purpose
Enter global configuration mode.
Enable CEF operation.
Enter interface configuration mode, and specify the Layer 3
interface to configure.
Enable CEF on the interface for software-forwarded traffic.
Return to privileged EXEC mode.
Display the CEF status on all interfaces.
Display CEF-related interface information by stack member for
all switches in the stack or for the specified switch.
(Optional) For slot-number, enter the stack member switch
number.
Display detailed CEF information for all interfaces or the
specified interface.
Display CEF adjacency table information.
(Optional) Save your entries in the configuration file.
Chapter 35 Configuring IP Unicast Routing
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