GRE SDP tunnel fragmentation and reassembly allows those services for which fragmentation is typically not available to make use of IP layer fragmentation and reassembly of GRE SDP tunnels that carry those services. It enables services that require larger MTUs to be carried over network segments where the MTU is less than the MTU of their respective GRE SDP tunnel packets. As a result, GRE SDP tunnel packets that require fragmentation are either fragmented at the source node or within the MTU restricted network, and reassembled on the GRE SDP terminating node.
GRE SDP tunnel fragmentation is supported on the following platforms:
VSR-I
VSR-a