When configuring Frame Relay on Cisco routers, you need to specify it as an encapsulation on serial interfaces. As I said earlier, you can’t use HDLC or PPP with Frame Relay. When you configure Frame Relay, you specify an encapsulation of Frame Relay (as shown in the following output).But unlike HDLC or PPP, with Frame Relay, there are two encapsulation types: Cisco and IETF (Internet Engineering Task Force). The following router output shows these two different encapsulation methods when Frame Relay is chosen on your Cisco router:
RouterA(config)#int s0
RouterA(config-if)#encapsulation frame-relay ?
ietf Use RFC1490 encapsulation
<cr>
The default encapsulation is Cisco unless you manually type in ietf, and Cisco is the type to use when connecting two Cisco devices. You’d opt for the IETF-type encapsulation if you needed to connect a Cisco device to a non-Cisco device with Frame Relay. Whichever you choose, make sure that the Frame Relay encapsulation is the same on both ends.
RouterA(config)#int s0
RouterA(config-if)#encapsulation frame-relay ?
ietf Use RFC1490 encapsulation
<cr>
The default encapsulation is Cisco unless you manually type in ietf, and Cisco is the type to use when connecting two Cisco devices. You’d opt for the IETF-type encapsulation if you needed to connect a Cisco device to a non-Cisco device with Frame Relay. Whichever you choose, make sure that the Frame Relay encapsulation is the same on both ends.
No comments:
Post a Comment