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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).
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 127 GRE tunnel interfaces.
IP Encapsulation within IP
IPIP tunneling is a method by which an IP packet is encapsulated within another IP packet. The Source
Address and Destination Address of the outer IP header identifies the endpoints of tunnel. Whereas Source
Address and Destination Address of the inner IP header identifies the original sender and recipient of the
packet, respectively.
Consider the following when configuring the IPIP tunnel interfaces:
•
A switch can support up to 127 IPIP tunnel interfaces.
•
IPIP tunnel interfaces are included in the maximum number of IP interfaces that are supported on the
switch.
page 1134
OmniSwitch AOS Release 7 Network Configuration Guide
March 2011
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