IETF and CISCO at end of MAP Statements

itgl72

Here is a frame relay config I'm trying to understand:

HQ
==


interface Serial0/0/0
description Link to Frame Relay Full Mesh
ip address 10.0.0.1 255.255.255.248
encapsulation frame-relay
frame-relay map ip 10.0.0.2 102 broadcast
frame-relay map ip 10.0.0.3 103 broadcast
frame-relay map ip 10.0.0.4 104 broadcast ietf
frame-relay lmi-type ansi






WEST
====


interface Serial0/0/0
description Link to Frame Relay Full Mesh
ip address 10.0.0.2 255.255.255.248
encapsulation frame-relay
frame-relay map ip 10.0.0.1 201 broadcast
frame-relay map ip 10.0.0.3 203 broadcast
frame-relay map ip 10.0.0.4 204 broadcast ietf
frame-relay lmi-type ansi




SOUTH
=====


interface Serial0/0/0
description Link to Frame Relay Full Mesh
ip address 10.0.0.3 255.255.255.248
encapsulation frame-relay
frame-relay map ip 10.0.0.1 301 broadcast
frame-relay map ip 10.0.0.2 302 broadcast
frame-relay map ip 10.0.0.4 304 broadcast ietf
frame-relay lmi-type ansi




EAST
====


interface Serial0/0/0
description Link to Frame Relay Full Mesh
ip address 10.0.0.4 255.255.255.248
encapsulation frame-relay ietf
frame-relay map ip 10.0.0.1 401 broadcast cisco
frame-relay map ip 10.0.0.2 402 broadcast cisco
frame-relay map ip 10.0.0.3 403 broadcast cisco
frame-relay lmi-type ansi


The EAST router (10.0.0.4) has an encapsulation of IETF. All the other router other than EAST that map to EAST have "broadcast ietf" at the end. What I originally setup on EAST was map commands that ended in "broadcast ietf" but packet tracer scored that as wrong. So I added "broadcast cisco" to the end of the EAST config's map statements. and it scored it right. All pings to all routers work.

My question is why? If EAST's encapsulation is IETF, and the other router's map statements to EAST have "broadcast ietf" at the end, seeing that EAST is IETF why would it not be right to put "broadcast ietf" at the end of its map statements instead of "broadcast cisco" which doesnt make sense to me at this moment?

TESTING:

I am able to ping all routers from EAST whether I use, and vice-versa:

frame-relay map ip 10.0.0.1 401 broadcast cisco
frame-relay map ip 10.0.0.2 402 broadcast cisco
frame-relay map ip 10.0.0.3 403 broadcast cisco

or

frame-relay map ip 10.0.0.1 401 broadcast ietf
frame-relay map ip 10.0.0.2 402 broadcast ietf
frame-relay map ip 10.0.0.3 403 broadcast ietf