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Configuring MLS
This chapter describes how to configure Multilayer Switching (MLS) for the Catalyst 6500 series
switches. MLS provides IP and Internetwork Packet Exchange (IPX) unicast Layer 3 switching and IP
multicast Layer 3 switching with Supervisor Engine 1, the Policy Feature Card (PFC), and the
Multilayer Switch Feature Card (MSFC) or MSFC2.
Note
For complete information on the syntax and usage information for the supervisor engine commands that
are used in this chapter, refer to the Catalyst 6500 Series Switch Command Reference publication.
This chapter consists of these sections:
•
•
•
•
Supervisor Engine 720 with PFC3A/PFC3B/PFC3BXL and MSFC3 and Supervisor Engine 32 with
Note
PFC3B/PFC3BXL and MSFC2A provide Layer 3 switching with Cisco Express Forwarding for PFC3
(CEF for PFC3). See
Supervisor Engine 2, PFC2, and MSFC2 provide Layer 3 switching with Cisco Express Forwarding for
Note
PFC2 (CEF for PFC2). See
Understanding How Layer 3 Switching Works
Layer 3 switching allows the switch, instead of a router, to forward IP and IPX unicast traffic and IP
multicast traffic between VLANs. Layer 3 switching is implemented in the hardware and provides
wire-speed interVLAN forwarding on the switch, rather than on the MSFC. Layer 3 switching requires
minimal support from the MSFC. The MSFC routes any traffic that cannot be Layer 3 switched.
Layer 3 switching supports the routing protocols that are configured on the MSFC. Layer 3 switching
Note
does not replace the routing protocols that are configured on the MSFC. Layer 3 switching uses IP
Protocol Independent Multicast (IP PIM) for multicast route determination.
OL-8978-04
Understanding How Layer 3 Switching Works, page 14-1
Default MLS Configuration, page 14-12
Configuration Guidelines and Restrictions, page 14-13
Configuring MLS, page 14-16
Chapter 13, "Configuring CEF for PFC2 and PFC3A,"
Chapter 13, "Configuring CEF for PFC2 and PFC3A,"
C H A P T E R
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
14
for more information.
for more information.
14-1
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Troubleshooting
