Displaying GRE Tunneling Information

This section describes the show commands that display the GRE tunnels configuration, the link status of the GRE tunnels, and the routes that use GRE tunnels. For field definitions of the following commands, refer to the RUCKUS FastIron Command Reference.

To display GRE tunneling Information, use the following commands:

• show ip interface
• show ip route
• show ip interface tunnel
• show ip tunnel traffic
• show interface tunnel
• show statistics tunnel

To view basic information about GRE tunnels, use the show ip interface command.

device# show ip interface

Interface  IP-Address  OK?  Method  Status  Protocol VRF           
Tunnel 1   101.1.1.1   YES  NVRAM   up 	    up       red             
Tunnel 3   89.1.1.1    YES  NVRAM   up 	    up       default-vrf

To display routes that are pointing to a GRE tunnel, use the show ip route command.

device# show ip route

Total number of IP routes: 3, avail: 79996 (out of max 80000)
B:BGP D:Connected  R:RIP  S:Static  O:OSPF *:Candidate default
     Destination     NetMask         Gateway        Port       Cost   Type
1    10.1.1.0        255.255.255.0   0.0.0.0         7          1      D
2    10.1.2.0        255.255.255.0   10.1.1.3        7          1      S
3    10.34.3.0       255.255.255.0   0.0.0.0         tn3        1      D

To display the link status and IP address configuration for an IP tunnel interface, use the show ip interface tunnel command.

device# show ip interface tunnel 64

Interface Tunnel 64
  port enabled
  port state: UP
  ip address: 223.224.64.0/31 
  Port belongs to VRF: default-vrf
  encapsulation: GRE, mtu: 1476, metric: 1
  directed-broadcast-forwarding: disabled
  proxy-arp: disabled
  ip arp-age:  10 minutes
  No Helper Addresses are configured.
  No inbound ip access-list is set
  No outgoing ip access-list is set

To display the GRE tunnel configuration and the Path MTU aging timer information, use the show interface tunnel command.

device# show interface tunnel 10

Tunnel10 is up, line protocol is up 
  Hardware is Tunnel
  Tunnel source  1.1.41.10
  Tunnel destination is 1.1.14.10
  Tunnel mode gre ip
  Port name is GRE_10_to_VR1_on_ICX_STACK
  Internet address is 223.223.1.1/31, 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

To display the link status of the tunnel and the number of keepalive packets received and sent on the tunnel, use the show ip tunnel traffic command.

device# show ip tunnel traffic

IP GRE Tunnels
      Tunnel Status  Packet Received  Packet Sent  KA recv  KA sent
  1   up/up          362              0            362      362
  3   up/up          0                0            0        0
  10  down/down      0                0            0        0

To display GRE tunnel statistics for a specifc tunnel ID number, use the show statistics tunnel command with a number for the specific tunnel ID.

device(config-tnif-10)# show statistics tunnel 1

IP GRE Tunnels
      Tunnel Status  Packet Received  Packet Sent  KA recv  KA sent
  1   up/up          87120            43943        43208    43855

RFC 2784 supports GRE tunnel ports. The show statistics tunnel command output now includes information from the hardware counters for each tunnel.

IP GRE Tunnel 1 HW Counters:
      InOctets                      0           OutOctets                0
      InPkts                        0           OutPkts                  0