CCNA Cisco Certified Network Associate Study Guide - FTP Server

Frame Relay 495
out the same interface they received the route update on. This can cause a
problem on a meshed Frame Relay network. However, by using subinterfaces,
routing protocols that receive route updates on one subinterface can
send out the same route update on another subinterface.
FIGURE 10.5 Partial meshed network examples
Creating Subinterfaces
You define subinterfaces with the int s0.subinterface number command
as shown below. You first set the encapsulation on the serial interface,
then you can define the subinterfaces.
RouterA(config)#int s0
RouterA(config)#encapsulation frame-relay