Monitoring Dynamic GRE Tunnels

Purpose

Display information about a dynamic GRE tunnel or a list of dynamic GRE tunnels. You can specify the detail keyword to view detailed information about tunnels. You can specify the state keyword and the state of the tunnel (disabled, down, enabled, lower-down, not-present, up) to view the number of tunnels in a specific state. To view the state of a specific tunnel, specify a tunnel name. To view the number of tunnels associated with an IP address, specify an IP address. You can specify an IP address with the virtual-router keyword and the name of the virtual router to view the number of tunnels associated with an IP address on the virtual router.

Action

To display three dynamic GRE tunnels:

host1:vr11#show gre tunnel
GRE tunnel mobileIp-dynamic-1 is Up
GRE tunnel mvpn-dynamic-2 is Up
GRE tunnel mvpn-dynamic-3 is Down

3 GRE tunnels found
3 tunnels were created dynamic

To display the detail of a dynamically created GRE tunnel for the data MDT application:

host1:vr11#show dvmrp tunnel detail mvpn-dynamic-1
GRE tunnel mvpn-dynamic-1 is Up
tunnel is dynamic
Application is MVPN
Tunnel operational configuration
  Tunnel mtu is '5000'
  Tunnel source address is '1.1.1.1'
  Tunnel destination address is '2.2.2.2'
  Tunnel transport virtual router is vr1
  Tunnel mdt is disabled
  Tunnel checksum option is disabled
  Tunnel sequence number option is disabled
  Tunnel up/down trap is enabled
  Tunnel-server location is 4/0
  Tunnel administrative state is Up
Statistics    packets              octets               discards   errors
  Data rx     0                    0                    0          0
  Data tx     0                    0                    0          0

1 GRE tunnel found 
1 tunnel was created dynamically

To display the detail of a dynamically created GRE tunnel for the Mobile IP application:

host1:vr12#show gre tunnel detail mobileIp-dynamic-1
GRE tunnel mobileIp-dynamic-1 is Up 
tunnel is dynamic
Application is Mobile-IP
Tunnel operational configuration
  Tunnel mtu is '5000'
  Tunnel source address is '6.6.6.6'
  Tunnel destination address is '3.3.3.3'
  Tunnel transport virtual router is vr1
  Tunnel mdt is disabled
  Tunnel checksum option is disabled
  Tunnel sequence number option is disabled
  Tunnel key is disabled
  Tunnel up/down trap is enabled
  Tunnel-server location is 6/0
  Tunnel administrative state is Up
Statistics    packets              octets               discards   errors
  Data rx     0                    0                    0          0
  Data tx     0                    0                    0          0

To display a summary of information about dynamic GRE tunnels:

host1#show gre tunnel summary
Administrative status    enabled    disabled
                         3          0
Operational status       up         down       not-present
                         3          0          0

Meaning

Table 29 lists the show gre tunnel command output fields.

Table 29: show gre tunnel Output Fields

Field Name	Field Description
GRE tunnel	Name and state of the dynamic GRE tunnel: Up—Tunnel is operational Down—Tunnel is not operational not-present—Tunnel is not operational, because the hardware (such as a line module) supporting the tunnel is inaccessible
Application	Name of the application that created the tunnel
Tunnel mtu	Value of the maximum transmission unit for the tunnel
Tunnel source address	IP address of the source of the tunnel
Tunnel destination address	IP address of the destination of the tunnel
Tunnel transport virtual router	Name of the virtual router associated with the tunnel
Tunnel mdt	State of the tunnel MDT
Tunnel checksum option	State of the checksum feature: enabled or disabled
Tunnel sequence number option	State of the sequence number feature; enabled or disabled
Tunnel up/down trap	Indicates whether or not the E Series router sends traps to SNMP when the operational state of the tunnels changes, enabled or disabled
Tunnel server location	Location of the tunnel server in slot/port format (ERX7xx models, ERX14xx models, and the ERX310 router) or slot/adapter/port format (E120 and E320 routers).
Tunnel is secured by ipsec transport interface	IPsec interface that secures the tunnel
Tunnel administrative state	Configured state of the tunnel: up or down
Statistics	Details of packets received or transmitted by the tunnel
packets	Number of packets received or transmitted by the tunnel
octets	Number of octets received or transmitted by the tunnel
discards	Number of packets not accepted by the tunnel
Errors	Number of packets with errors received or transmitted by the tunnel
Data rx	Received data
Data tx	Transmitted data
Tunnels found	Total number of GRE tunnels found
Tunnels were created dynamic	Number of tunnels created dynamically
Administrative status	Administrative status: enabled—Tunnel is available for use disabled—Tunnel is not available for use
Operational status	Operational status: up—Tunnel is operational down—Tunnel is not operational not-present—Tunnel is not operational, because the hardware (such as a line module) supporting the tunnel is inaccessible

Monitoring Dynamic GRE Tunnels

Purpose

Action

Meaning

Related Documentation