Tunneling Configuring IP
page 18-32 OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008
Tracing an IP Route
The traceroute command is used to find the path taken by an IP packet from the local switch to a speci-
fied destination. This command displays the individual hops to the destination as well as some timing
information. When using this command, you must enter the name of the destination as part of the
command line (either the IP address or host name). Use the optional max-hop parameter to set a maxi-
mum hop count to the destination. If the trace reaches this maximum hop count without reaching the desti-
nation, the trace stops.
For example, to perform a traceroute to a device with an IP address of 172.22.2.115 with a maximum hop
count of 10 you would enter:
-> traceroute 172.22.2.115 max-hop 10
Displaying TCP Information
Use the show tcp statistics command to display TCP statistics. Use the show tcp ports command to
display TCP port information.
Displaying UDP Information
UDP is a secondary transport-layer protocol that uses IP for delivery. UDP is not connection-oriented and
does not provide reliable end-to-end delivery of datagrams. But some applications can safely use UDP to
send datagrams that do not require the extra overhead added by TCP. Use the show udp statistics
command to display UDP statistics. Use the show udp ports command to display UDP port information.
Tunneling
Tunneling is a mechanism that can encapsulate a wide variety of protocol packet types and route them
through the configured tunnels. Tunneling is used to create a virtual point-to-point link between routers at
remote points in a network. This feature supports the creation, administration, and deletion of IP inter-
faces whose underlying virtual device is a tunnel. The Alcatel-Lucent implementation provides support for
two tunneling protocols: Generic Routing Encapsulation (GRE) and IP encapsulation within IP(IPIP).
Note. The tunneling feature is supported by OmniSwitch 6850 and OmniSwitch 9000.
Generic Routing Encapsulation
GRE encapsulates a packet that needs to be carried over the GRE tunnel with a GRE header. The resulting
packet is then encapsulated with an outer header by the delivery protocol and forwarded to the other end of
the GRE tunnel. The destination IP address field in the outer header of the GRE packet contains the IP
address of the router at the remote end of the tunnel. The router at the receiving end of the GRE tunnel
extracts the original payload and routes it to the destination address specified in the payload’s IP header.
Consider the following when configuring the GRE tunnel interfaces:
• A switch can support up to 8 GRE tunnel interfaces.
• The features such as Multinetting, Egress ACL, NAT, QoS, and VRRP are not supported on the GRE
tunnel interfaces.
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