Enabling ipv4 multicast routing over a gre tunnel – Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 User Manual

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Brocade ICX 6650 Layer 3 Routing Configuration Guide

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IPv4 point-to-point GRE tunnels

This command configures the device to wait for 20 minutes before resetting the path MTU to its
original value.

Syntax: [no] tunnel path-mtu-discovery age-timer minutes | infinite

For minutes, enter a value from 10 to 30.

Enter infinite to disable the timer.

Clearing the PMTUD dynamic value

To reset a dynamically-configured MTU on a tunnel Interface back to the configured value, enter the
following command.

Brocade(config)# clear ip tunnel pmtud 1

Syntax: clear ip tunnel pmtud tunnel-ID

The tunnel-ID variable is a valid tunnel number or name.

Viewing PMTUD configuration details

Use the show interface tunnel command to view the PMTUD configuration and to determine
whether PMTUD has reduced the size of the MTU. For details about the show interface tunnel
command, refer to

“Displaying GRE tunneling information”

on page 108.

Enabling IPv4 multicast routing over a GRE tunnel

This section describes how to enable IPv4 multicast protocols, PIM Sparse (PIM-SM) and PIM
Dense (PIM-DM), on a GRE tunnel. Perform the procedures in this section after completing the
required tasks in

Table 13

on page 100.

For an overview of multicast routing support over a GRE tunnel, refer to

“Support for IPv4 multicast

routing over GRE tunnels”

on page 97. To view information about multicast protocols and GRE

tunnel-specific information, refer to

“Displaying multicast protocols and GRE tunneling information”

on page 110.

Enabling PIM-SM on a GRE tunnel

To enable PIM-SM on a GRE tunnel interface, enter commands such as the following:

Brocade(config)# interface tunnel 10