Enabling Path Mtu Discovery; Assigning Vrf Membership To A Tunnel Interface - Cisco 7206 - VXR Router Configuration Manual

Configuring IP Tunnels
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m
DETAILED STEPS
Command
Step 1
configure terminal
Example:
switch# configure terminal
switch(config)#
Step 2
interface tunnel number
Example:
switch(config)# interface tunnel 1
switch(config-if)#
Step 3
tunnel mode gre ip
Example:
switch(config-if)# tunnel mode gre ip
Step 4
show interfaces tunnel number
Example:
switch(config-if)# show interfaces
tunnel 1
Step 5
copy running-config startup-config
Example:
switch(config-if)# copy running-config
startup-config
This example shows how to configure the tunnel interface to GRE and set the GRE tunnel keepalives:
switch# configure terminal
switch(config)# interface tunnel 1
switch(config-if)# tunnel mode gre ip
switch(config-if)# copy running-config startup-config

Enabling Path MTU Discovery

Use the tunnel path-mtu discovery command to enable path MTU discovery on a tunnel.
Command
tunnel path-mtu-discovery [age-timer min]
[min-mtu bytes]
Example:
switch(config-if)# tunnel
path-mtu-discovery 25 1500

Assigning VRF Membership to a Tunnel Interface

You can add a tunnel interface to a VRF.
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
8-8
Chapter 8
Purpose
Enters configuration mode.
Enters a tunnel interface configuration mode.
Sets this tunnel mode to GRE
(Optional) Displays the tunnel interface statistics.
(Optional) Saves this configuration change.
Purpose
Enables Path MTU Discovery (PMTUD) on a
tunnel interface. The parameters are as follows:
mins—Number of minutes. The range is from
•
10 to 30. The default is 10.
mtu-bytes—Minimum MTU recognized. The
•
range is from 92 to 65535. The default is 92.
Configuring IP Tunnels
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