Name: Cisco 7609
Brand: Cisco
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17-5

Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E

78-14064-04

Chapter 17 Configuring IP Unicast Layer 3 Switching on Supervisor Engine 2

Configuring Hardware Layer 3 Switching

Note For information on configuring unicast routing on the MSFC2, see Chapter 12, “Configuring Layer 3

Interfaces.”

Hardware Layer 3 switching is permanently enabled on Supervisor Engine 2 with PFC2, MSFC2, and

Distributed Feature Card (DFC). No configuration is required.

To display information about Layer 3-switched traffic, perform this task:

This example shows how to display information about hardware Layer 3-switched traffic on Fast

Ethernet port 3/3:

Router# show interface fastethernet 3/3 | begin L3

L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 12 pkt, 778 bytes mcast

L3 out Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes

4046399 packets input, 349370039 bytes, 0 no buffer

Received 3795255 broadcasts, 2 runts, 0 giants, 0 throttles

<...output truncated...>

Router#

Note The Layer 3 switching packet count is updated approximately every five seconds.

Cisco IOS CEF and dCEF are permanently enabled on the MSFC2. No configuration is required to

support hardware Layer 3 switching.

The Cisco IOS CEF ip load-sharing per-packet, ip cef accounting per-prefix, and ip cef accounting

non-recursive commands on the MSFC2 apply only to traffic that is CEF-switched in software on the

MSFC2. The commands do not affect traffic that is hardware Layer 3 switched on the PFC2 or on

DFC-equipped switching modules.

For information about Cisco IOS CEF and dCEF on the MSFC2, refer to these publications:

• The “Cisco Express Forwarding” section at this URL:

http//www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/switch_c/xcprt2/index.

htm

• The Cisco IOS Switching Services Command Reference publication at this URL:

http//www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/switch_r/index.htm

Command Purpose

Router# show interface {{type

slot/port} |

{port-channel number}} | begin L3

1. type = ethernet, fastethernet, gigabitethernet, or tengigabitethernet

Displays a summary of Layer 3-switched traffic.

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