Does frame-relay encapsulation have to be the same at both

From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Sun Sep 02 2007 - 04:55:08 ART


Hi Group,

This may sound like a really really mundane question but I'd like to seek
clarification from the group.

R6 is the hub with two PVCs; one going to R2 and one to R5.

R6 Config
---------
!
interface Serial0/0/0
 no ip address
 encapsulation frame-relay IETF
 no frame-relay inverse-arp
 frame-relay lmi-type cisco
!
interface Serial0/0/0.2 multipoint
 ip address 172.16.25.6 255.255.255.0
 frame-relay map ip 172.16.25.2 601 broadcast CISCO
 frame-relay map ip 172.16.25.5 605 broadcast
 no frame-relay inverse-arp
!

R6#sh fram map
Serial0/0/0.2 (up): ip 172.16.25.2 dlci 601(0x259,0x9490), static,
              broadcast,
              CISCO, status defined, active
Serial0/0/0.2 (up): ip 172.16.25.5 dlci 605(0x25D,0x94D0), static,
              broadcast,
              IETF, status defined, active

R2 Config
---------
!
interface Serial0/0/0
 ip address 172.16.25.2 255.255.255.0
 encapsulation frame-relay IETF
 frame-relay map ip 172.16.25.6 106 broadcast
 no frame-relay inverse-arp
 frame-relay lmi-type cisco
!

R2#sh fram map
Serial0/0/0 (up): ip 172.16.25.6 dlci 106(0x6A,0x18A0), static,
              broadcast,
              IETF, status defined, active

I intentionally set CISCO encapsulation on R6 for DLCI 601 (going to R2). On
R2, DLCI 106 (going to R6) uses IETF encapsulation.

Both routers can still ping to each other. Isn't the connection supposed to
fail with the mismatch encapsulation?

Please advise.

Thank you.

B.Rgds,
Lim TS



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