Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 118)

100 Brocade ICX 6650 Layer 3 Routing Configuration Guide
53-1002603-01
IPv4 point-to-point GRE tunnels
Configuration tasks for GRE tunnels
Brocade recommends that you perform the configuration tasks in the order listed in Table 13.
The following features are also supported on GRE tunnel interfaces:
• Naming the tunnel interface (CLI command port-name) – for configuration details, refer to the
section “Assigning a port name” in the Brocade ICX 6650 Administration Guide.
• Changing the Maximum Transmission Unit (MTU) (CLI command ip mtu) – for configuration
details, refer to
“Changing the MTU on an individual port” on page 30.
• Increasing the cost of routes learned on the port (CLI command ip metric) – for configuration
details, refer to
“Changing the cost of routes learned on a port” on page 144.
After performing the configuration steps listed in Table 13, you can view the GRE configuration and
observe the routes that use GRE tunnels. For details, refer to
“Displaying GRE tunneling
information” on page 108.
TABLE 13 Configuration tasks for GRE tunnels
Configuration tasks Default behavior For more information
Required tasks
1 Create a tunnel interface Not assigned “Creating a tunnel interface” on
page 101
2 Configure the source address or source
interface for the tunnel interface Not assigned “Configuring the source address or
source interface for a tunnel
interface”
on page 101
3 Configure the destination address of the
tunnel interface Not assigned “Configuring the destination address
for a tunnel interface”
on page 102
4 Enable GRE encapsulation on the tunnel
interface Disabled “Enabling GRE encapsulation on a
tunnel interface”
on page 102
5 Configure an IP address for the tunnel
interface Not assigned “Configuring an IP address for a
tunnel interface”
on page 103
6 If a route to the tunnel destination
(configured in Step 3) does not already
exist, create a static route to the tunnel
destination. Not assigned “Configuring a static route to a tunnel
destination”
on page 103
Optional tasks
1 Change the maximum transmission unit
(MTU) value for the tunnel interface 1476 bytes or
10194 bytes (jumbo
mode) “Changing the MTU value for a tunnel
interface”
on page 104
2 Change the number of GRE tunnels
supported on the device Support for 32 GRE
tunnels “Changing the maximum number of
tunnels supported”
on page 104
3 Enable and configure GRE link keepalive
on the tunnel interface Disabled “Configuring GRE link keepalive” on
page 104
4 Change the Path MTU Discovery (PMTUD)
configuration on the GRE tunnel interface Enabled “Configuring Path MTU Discovery” on
page 105
5 Enable support for IPv4 multicast routing Disabled “Enabling IPv4 multicast routing over
a GRE tunnel”
on page 106