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Multicast

The multicast commands are used to set interface-specific options such as time-to-live (TTL) thresholds and administratively scoped boundaries.

Related Topics

clear ip mroute

ip multicast boundary

ip multicast ttl-threshold

show ip mroute

show ip multicast boundary

show ip multicast ttl-threshold

clear ip mroute

Name

clear ip mroute - clears routes in the multicast routing table

Syntax

clear ip mroute gr_address? sr_address?

Mode

User Execution

Parameters

gr_address - optionally specify a valid IPv4 multicast group address that you want removed from the multicast routing table

sr_address - optionally specify a valid IPv4 multicast source address that you want removed from the multicast routing table

Description

Use the clear ip mroute command to remove routes from the multicast routing table. If this command is issued without arguments, then all group and source information will be cleared. Similarly, you can specify to clear a specific group and/or source multicast address.

Command History

NGC 2.2 - This command was introduced.

Examples

The following example clears group/source 226.1.1.1/192.168.0.1 from the multicast routing table.

> clear ip mroute 226.1.1.1 192.168.0.1

ip multicast boundary

Name

ip multicast boundary - specifies an administratively scoped boundary for a single multicast group on the associated interfaces.

Syntax

ip multicast boundary group group-address masklen length

no ip multicast boundary group group-address masklen length

Mode

Interface Configuration

Parameters

group group-address - specify a valid IPv4 address to denote the group address

masklen length - the length of the mask associated with the group prefix, specified as an integer

Description

ip multicast boundary is used to configure administratively scoped group boundaries on the indicated interface(s).

Default

The ip multicast boundary command is not explicitly configured by default.

Command History

NGC 2.2 - This command was introduced.

Examples

In the following example, an administratively scoped boundary for multicast group 224.5.5.5 is configured.

(config-if)# ip multicast boundary group 224.5.5.5
masklen 24

ip multicast ttl-threshold

Name

ip multicast ttl-threshold - specifies the minimum time-to-live that a multicast data packet can have and still be forwarded over the associated interface

Syntax

ip multicast ttl-threshold ttl

no ip multicast ttl-threshold [ ttl ]?

Mode

Interface Configuration

Parameters

ttl - an integer from 0 to 255, inclusive

Description

The ip multicast ttl-threshold command specifies the minimum time-to-live plus1 that a multicast data packet can have and still be forwarded over the associated interface. A value of 0 indicates that no multicast data packets should be forwarded over the associated interface(s).

Default

If ip multicast ttl-threshold is not configured, it is the same as if the user had specified the following:
(config-if)# ip multicast ttl-threshold 0

Command History

NGC 2.2 - This command was introduced.

Examples

The following example configures a threshold of 20 on interface fxp1.

(config)# interface fxp1

(config-if)# ip multicast ttl-threshold 20

show ip mroute

Name

show ip mroute - displays the contents of the Multicast Routing Table

Syntax

show ip mroute

Mode

User Execution

Parameters

none

Description

The output of the show ip mroute query displays the content of the Multicast routing table.

Command History

NGC 2.2 - This command was introduced.

Examples

The following example shows a response to the show ip mroute query.

> show ip mroute

IP Multicasting Routing Table

(*, 224.1.1.1), uptime 0:01:20
Incoming interface: fxp0, RPF neighbor 10.2.11.31
Outgoing interface list:
fxp1

(192.168.101.100, 224.2.2.2), uptime 0:01:20
Incoming interface: fxp1, RPF neighbor 10.2.12.32
Outgoing interface list:
fxp1

Field Descriptions

The following table describes the fields that appear in the Multicast MRT Query.

Table 11‑1 Multicast MRT Query Fields

Field

Description

(*, 224.1.1.1), (192.168.101.100, 224.2.2.2)

The entries in the IP multicast routing table.

Uptime

The length of time that the (*,G) or (S,G) entry has been created in hours:minutes:seconds.

Incoming interface

The expected interface for a multicast packet from the source.

RPF neighbor

The IP address of the upstream router to the source.

Outgoing interface list

The interfaces through which packets will be forwarded.

show ip multicast boundary

Name

show ip multicast boundary - displays all boundaries within all interfaces

Syntax

show ip multicast boundary

Mode

User Execution

Parameters

none

Description

Use the show ip multicast boundary query to obtain summarized information for all boundaries within all interfaces.

Command History

NGC 2.2 - This command was introduced.

Examples

The following example shows a response to the show ip multicast boundary query.

> show ip multicast boundary

[1]fxp0, 224.5.5.0/24

[2]fxp0, 224.5.10.0/24

[3]fxp1, 239.5.0.0/16

show ip multicast ttl-threshold

Name

show ip multicast ttl-threshold - displays information about the multicast TTL threshold

Syntax

show ip multicast ttl-threshold

Mode

User Execution

Parameters

none

Description

The output of the show ip multicast ttl-threshold query displays information about the multicast TTL threshold.

Command History

NGC 2.2 - This command was introduced.

Examples

The following example shows the output of a show ip multicast ttl-threshold query.

> show ip multicast ttl-threshold
fxp0, 1
fxp2, 5

Field Descriptions

The following table describes the fields that appear in the Multicast TTL Threshold Query.

Table 11‑1 Multicast TTL Threshold Query Fields

Field

Description

fxp0, 1 and fxp1, 5

Shows the ttl-threshold value for each interface.

 
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