Restrictions On Ip Multicast - Cisco Catalyst 4500 series Administration Manual

Chapter 37 Configuring 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
hardware.
Figure 37-2
Integrated Switching Engine (ASIC)
L3 physical
interface
Gig 1/1
This section contains the following subsections:
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Restrictions on IP Multicast

Restrictions on IP Multicast include the following:
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OL_28731-01
shows a logical view of Layer 2 and Layer 3 forwarding in the integrated switching engine
Logical View of Layer 2 and Layer 3 Forwarding in Hardware
Logical Router
L3 logical
interfaces
VLAN1
L2 switchports
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
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,
VLAN2
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
About IP Multicast
37-5