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.
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
Enabling IPv4 multicast routing over a GRE tunnel
.
For an overview of multicast routing support over a GRE tunnel, refer to
Support for IPv4 multicast routing over GRE tunnels
on page
105. To view information about multicast protocols and GRE tunnel-specific information, refer to
Displaying multicast protocols and
NOTE
For the SX-FI624C, SX-FI624P, SX-FI624HF, and the SX-FI62XG modules, each PIM-enabled tunnel interface must have a
dedicated
tunnel loopback port. This differs from GRE tunnels that support unicast traffic only. For unicast traffic, multiple GRE
tunnels can use the same tunnel loopback port for traffic.
Enabling PIM-SM on a GRE tunnel
To enable PIM-SM on a GRE tunnel interface, enter commands such as the following:
device(config)# interface tunnel 10
device(config-tnif-10)# ip pim-sparse
Syntax:
[no] ip pim-sparse
Use the
no
form of the command to disable PIM-SM on the tunnel interface.
Enabling PIM-DM on a GRE tunnel interface
To enable PIM-DM on a GRE tunnel interface, enter commands such as the following:
device(config)# interface tunnel 10
device(config-tnif-10)# ip pim
Syntax:
[no] ip pim
Use the
no
form of the command to disable PIM-DM on the tunnel interface.
Example point-to-point GRE tunnel configuration
A GRE Tunnel is configured between FastIron A and device B. Traffic between networks 10.10.1.0/24 and 10.10.2.0/24 is
encapsulated in a GRE packet sent through the tunnel on the 10.10.3.0 network, and unpacked and sent to the destination network. A
static route is configured at each Layer 3 switch to go through the tunnel interface to the target network.
IPv4 point-to-point GRE tunnels
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