ETR
Egress Tunnel Router
Router that de-encapsulates LISP packets coming from sites outside the LISP site and destined for the LISP site
ITR
Ingress Tunnel Router
Router that LISP encapsulates packets coming from EIDs that are destined outside the LISP Site.
xTR
Tunnel Router
Performs both Ingress and Egress tunnel functions.
UDP 500
IKE/ISAKMP
TCP 49
TACACS+
UDP 1645
UDP 1646
RADIUS- Cisco
Authentication
Accounting
UDP 1812
UDP 1813
RADIUS- Industry
Authentication
Accounting