Configure Gre Tunnel - Nortel Optical Multiservice Edge 6130 Planning Manual

10-18 Appendix A: Data communications planning

Configure GRE tunnel

TCP/IP Generic routing encapsulation (GRE) is a standard transport layer
encapsulation protocol which provides a standard method for transporting one
arbitrary network layer protocol over another arbitrary network layer protocol
(tunneling). A tunnel is effectively a point-to-point connection which allows
packets to be enclosed/encapsulated within another packet.
GRE tunnel
Two GRE types are supported:
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Static GRE tunnel
OME6130 supports only one instance of static GRE tunnel per network
element. The user creates a static tunnel by specifying a protocol (IP) and a
tunnel termination point (OSI address). The static GRE supports only IP over
OSI tunneling.
Optical Multiservice Edge 6130
Static GRE tunnel : Static tunnels are user defined point-to-point tunnels
used to pass packets from one node to another. Static tunnels are ideal for
bridging sections of a network which do not support a protocol (for
example, routing IP packets through an OSI network). The user creates a
static tunnel by specifying a protocol (OSI or IP) and a tunnel termination
point (MAC address).
Note: Creating a static tunnel to a specific destination only allows packets
to be sent to that destination. You must configure a tunnel in the opposite
direction for packets to be returned.
Auto GRE tunnel: Auto-tunnels are dynamically created and removed as
required by a dual router. Auto-tunnels do not require user intervention but
only operate between iISIS capable nodes where OSI communications can
be reached between the nodes. Auto-tunnels configure multiple tunnels to
multiple destinations depending upon the best route through
multi-protocol networks that support iISIS.
Note: Static GRE and Auto GRE tunnels support only IP over OSI
tunnelling.
Note 1: The static GRE tunnel is user provisionable. For optimal
performance the static GRE tunnel should be provisioned provided there is
a LAPD or PPP interface on which iISIS is enabled. If there is no interface
with iISIS enabled then all packets into static GRE shall be dropped.
Note 2: Creating a static tunnel to a specific destination only allows
packets to be sent to that destination. You must configure a tunnel in the
opposite direction for packets to be returned.
Note 3: The OME6130 supports enabling of OSPF routing protocol on a
static GRE tunnel interface. When enabled, OSPF exchanges packets over
the GRE interface and treats the NE of the other end of the GRE tunnel as
its neighbor.
NT6Q92MA Rel 1.0 Iss 1 Standard September 2006