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Figure 20: Transport and Tunnel Networks Using Different Routing Protocols
Creating Multicast VPNs Using GRE Tunnels
For information about configuring multicast VPNs using GRE tunnels, see Configuring
PIM for IPv4 Multicast in JUNOSe Multicast Routing Configuration Guide.
Monitoring IP Tunnels
You can monitor DVMRP and GRE tunnels by using the following commands.
show dvmrp tunnel
Use to display information about DVMRP tunnels.
To view detailed information about tunnels, specify the detail keyword.
To view the number of tunnels in a specific state, specify the state keyword and
the state of the tunnel (disabled, down, enabled, lower-down, not-present, up).
To view the state of a specific tunnel, specify a tunnel name.
To view the number of tunnels associated with that IP address, specify an IP
address.
To view the number of tunnels associated with an IP address on the virtual router,
specify an IP address with the virtual-router keyword and the name of the virtual
router.
Field descriptions
Tunnel 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
Tunnel name Name of the tunnel
Tunnel mtu Value of the maximum transmission unit for the tunnel
Tunnel source address IP address of the source of the tunnel
Chapter 9: Configuring IP Tunnels
253
Monitoring IP Tunnels
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