Guidelines and limitations, Enabling multicast routing – Cisco ASA 5505 User Manual

Page 495

Advertising
background image

26-3

Cisco ASA 5500 Series Configuration Guide using the CLI

Chapter 26 Configuring Multicast Routing

Guidelines and Limitations

Guidelines and Limitations

This section includes the guidelines and limitations for this feature.

Context Mode Guidelines

Supported in single context mode. In multiple context mode, unshared interfaces and shared interfaces
are not supported.

Firewall Mode Guidelines

Supported only in routed firewall mode. Transparent firewall mode is not supported.

IPv6 Guidelines

Does not support IPv6.

Enabling Multicast Routing

Enabling multicast routing lets you enable multicast routing on the ASA. Enabling multicast routing
enables IGMP and PIM on all interfaces by default. IGMP is used to learn whether members of a group
are present on directly attached subnets. Hosts join multicast groups by sending IGMP report messages.
PIM is used to maintain forwarding tables to forward multicast datagrams.

Note

Only the UDP transport layer is supported for multicast routing.

To enable multicast routing, enter the following command:

Table 26-1

lists the maximum number of entries for specific multicast tables based on the amount of

RAM on the ASA. Once these limits are reached, any new entries are discarded.

Command

Purpose

multicast-routing

Example:

hostname(config)# multicast-routing

Enables multicast routing.

The number of entries in the multicast routing tables are limited by the
amount of RAM on the ASA.

Table 26-1

Entry Limits for Multicast Tables

Table

16 MB 128 MB 128+ MB

MFIB

1000

3000

5000

IGMP
Groups

1000

3000

5000

PIM Routes 3000

7000

12000

Advertising