In switching mode, the uPIM appears in the list of interfaces
as a single interface, which is the first interface on the uPIM—for
example, ge-2/0/0. You can optionally configure each uPIM
port only for autonegotiation, speed, and duplex mode. A uPIM in switching
mode can perform the following functions:
Layer 3 forwarding—Routes traffic destined for WAN
interfaces and other PIMs present on the chassis.
Layer 2 forwarding—Switches intra-LAN traffic from
one host on the LAN to another LAN host (one port of uPIM to another
port of same uPIM).
