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Chapter 7
Troubleshooting Serial Line and Frame Relay Connectivity
Let's highlight the relevant Frame Relay terms:
Encapsulation Cisco routers support two types of Frame Relay: Cisco
and IETF.
LMI enq sent This is the number of LMI enquiries sent.
LMI stat recvd This is the number of LMI status packets received.
LMI upd recvd This is the number of LMI updates received.
DTE LMI This is the status of the DTE Local Management Interface.
LMI enq recvd This is the number of LMI enquiries received.
LMI stat sent This is the number of LMI status packets sent.
LMI upd sent This is the number of LMI updates sent.
LMI DLCI This is the DLCI number used for LMI. Cisco LMI type uses
DLCI 1023. When ANSI is used, the LMI DLCI is 0.
LMI type This is the LMI type used by the interface. Default is Cisco. The
other two types are ANSI and ITU-T. The LMI type must match on the router
and the Frame Relay switch. Simply put, LMI type must match on the DTE and
DCE equipment.
show frame-relay lmi
The show frame-relay lmi command displays LMI-relevant information.
The output contains the LMI type, enquiry, update, and status information:
Router_B#show frame-relay lmi
LMI Statistics for interface Serial0 (Frame Relay DTE) LMI
TYPE = CISCO
Invalid Unnumbered info 0 Invalid Prot Disc 0
Invalid dummy Call Ref 0 Invalid Msg Type 0
Invalid Status Message 0 Invalid Lock Shift 0
Invalid Information ID 0 Invalid Report IE Len 0
Invalid Report Request 0 Invalid Keep IE Len 0
Num Status Enq. Sent 823406 Num Status msgs Rcvd
823403
Num Update Status Rcvd 507 Num Status Timeouts 3
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