TechLibrary

Navigation

Table of Contents

Guide That Contains This Content

[+] Expand All

[-] Collapse All

Verifying That Generic Routing Encapsulation Tunneling Is Working Correctly

Purpose

Verify that the generic routing encapsulation (GRE) interface is sending tunneled traffic.

Action

Display status information about the specified GRE interface with the command show interfaces (GRE).

user@switch> show interfaces gr-0/0/0

Physical interface: gr-0/0/0, Enabled, Physical link is Up
Interface index: 132, SNMP ifIndex: 26
  Type: GRE, Link-level type: GRE, MTU: Unlimited, Speed: 800mbps
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)

  Logical interface gr-0/0/0.0 (Index 68) (SNMP ifIndex 47) 
    Flags: Point-To-Point SNMP-Traps 16384
    IP-Header 1.1.1.2:1.1.1.1:47:df:64:0000000000000000 Encapsulation: GRE-NULL
  Input packets : 0 
  Output packets: 0
    Protocol inet, MTU: 1476
      Flags: None
      Addresses, Flags: Is-Primary
        Local: 1.10.1.1

Meaning

The output indicates that the GRE interface gr-0/0/0 is up. The output displays the name of the physical interface, and the traffic statistics on the interface: the number of and the rate at which input and output bytes and packets are received and transmitted on the physical interface.