Cisco Catalyst 4500 Series Administration Guide

37-5
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
OL_28731-01
Chapter 37 Configuring IP Multicast
About IP Multicast
The integrated switching engine hardware supports interfaces for inter-VLAN routing and switch ports
for Layer 2 bridging. It also provides a physical Layer 3 interface that can be configured to connect with
a host, a switch, or a router.
Figure 37-2 shows a logical view of Layer 2 and Layer 3 forwarding in the integrated switching engine
hardware.
Figure 37-2 Logical View of Layer 2 and Layer 3 Forwarding in Hardware
This section contains the following subsections:
• Restrictions on IP Multicast, page 37-5
• CEF, MFIB, and Layer 2 Forwarding, page 37-6
• IP Multicast Tables, page 37-7
• Hardware and Software Forwarding, page 37-9
• Non-Reverse Path Forwarding Traffic, page 37-10
• Multicast Fast Drop, page 37-11
• Multicast Forwarding Information Base, page 37-12
• S/M, 224/4, page 37-13
• Multicast HA, page 37-13
Restrictions on IP Multicast
Restrictions on IP Multicast include the following:
• Starting with Release IOS XE 3.3.0SG and IOS 15.1(1)SG, the seven RP restriction was removed.
• IPv4 Bidirectional (Bidir) PIM is supported on the Catalyst 4500 series switch. IPv6 Bidir PIM is
not.
• For some multicast groups, when more than 8K mroutes are installed in a system, the network may
experience higher traffic losses upon switchover of the HA system. This is due to flushing the old
multicast forwarding entries before the new entries are updated. As the number of routes increase,
Integrated Switching Engine (ASIC)
L3 physical
interface
Logical Router
L3 logical
interfaces
L2 switchports
68402
VLAN1
Gig 1/1
VLAN2

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E