show interfaces tunnel

Displays tunnel interface information.
Syntax
show interfaces tunnel tunnel-number
Parameters
tunnel-number
Specifies the tunnel number. Valid values range from 1 through 72.
Modes

Privileged EXEC mode

The show interfaces tunnel command displays the following information:

Field

Definition

Hardware is Tunnel

The interface is a tunnel interface.

Tunnel source

The source address for the tunnel.

Tunnel destination

The destination address for the tunnel.

Tunnel mode

The tunnel mode. The gre specifies that the tunnel will use GRE encapsulation (IP protocol 47).

Interface bandwidth

The configured bandwidth on a tunnel interface for routing metric purposes only.

Port name

The port name (if applicable).

Internet address

The internet address.

MTU

The configured path maximum transmission unit.

encapsulation GRE

GRE encapsulation is enabled on the port.

Keepalive

Indicates whether or not GRE link keepalive is enabled.

Path MTU Discovery

Indicates whether or not PMTUD is enabled. If PMTUD is enabled, the MTU value is also displayed.

Path MTU

The PMTU that is dynamically learned.

Age-timer

Indicates the pmtd aging timer configuration in minutes.The default is 10. The range is from 10 - 30.

Path MTU will expire

Indicates the time after which the learned PMTU expires. This line is displayed only when a PMTU is dynamically learned.

Examples

This example displays the GRE tunnel configuration and the pmtd aging timer information.. 

show interfaces tunnel 10
Tunnel10 is up, line protocol is up 
  Hardware is Tunnel
  Tunnel source  10.1.41.10
  Tunnel destination is 10.1.14.10
  Tunnel mode gre ip
  Port name is GRE_10_to_VR1_on_ICX_STACK
  Internet address is 10.11.1.1/31, MTU 1476 bytes, encapsulation GRE
  Keepalive is not Enabled
  Path MTU Discovery: Enabled, MTU is 1428 bytes, age-timer: 10 minutes 
  Path MTU will expire in 0 minutes 50 secs

This example shows information for the configured interface bandwidth value on a tunnel interface. 

device# show interfaces tunnel 2

Tunnel2 is up, line protocol is up
  Hardware is Tunnel
  Tunnel source  10.70.15.1
  Tunnel destination is 10.70.15.2
  Tunnel mode gre ip
  Interface bandwidth is 2000 kbps 
  No port name
  Internet address is: 10.0.0.1/24
  Tunnel TOS 0, Tunnel TTL 255, Tunnel MTU 1476 bytes
  Keepalive is not Enabled

  Tunnel Packet Statistics:
                                 Unicast Packets                    Multicast Packets
        In-Port(s)         [Rcv-from-tnnl    Xmit-to-tnnl]     [Rcv-from-tnnl    Xmit-to-tnnl]
        e1/1/1 - e1/1/24   2224              0                 0                 0
History
Release version Command history
08.0.30 This command was modified to include configured bandwidth status.
Parent topic: Show Commands