Back-to-back frame-relay means that there is no frame switch and there is a direct connection between the two routers. (I believe this is only used in testing but would never be used in production)
No keepalives - disables LMI processing and is the only way an interface that is back-to-back will come up. DLCI need to be the same - this is because there is no frame switch and DLCI's are locally significant. Since they share the same wire they need to be the same if not then a frame switch needs to be configured to switch between the DLCIs and at this point it is no longer back-to-back Correct me if I am wrong From: Amer Mustafa [mailto:[email protected]] Sent: October-11-10 8:54 PM To: Jason Maynard Cc: [email protected] Subject: Re: [OSL | CCIE_RS] WB1 ==> LAB 11 ==> Task 11.4. Jason, It worked , but please can you explain this back-to-back frame-relay thing ? what does that mean technically ? R6(config-subif)#inter ser 0/2/0.32 R6(config-subif)#frame inter R6(config-subif)#frame interface-dlci 906 R6(config-fr-dlci)#exit R6(config-subif)# Oct 12 00:52:19.795: %OSPF-5-ADJCHG: Process 1, Nbr 200.0.0.9 on Serial0/2/0.32 from LOADING to FULL, Loading Done R6(config-subif)#do ping 150.50.69.6 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 150.50.69.6, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms R6(config-subif)# On Tue, Oct 12, 2010 at 3:48 AM, Jason Maynard <[email protected]> wrote: Is this back-to-back frame-relay If so have a look at the keepalives and ensure the DLCI's are the same on each end I have added an example on my blog http://packetsanalyzed.blogspot.com/2010/04/question-53.html From: [email protected] [mailto:[email protected]] On Behalf Of Amer Mustafa Sent: October-11-10 8:20 PM To: [email protected] Subject: [OSL | CCIE_RS] WB1 ==> LAB 11 ==> Task 11.4. WB1 ==> LAB 11 ==> Task 11.4. For some reaon R9 is showing the interface Serial 0/2/0.32 in down/down state, i have tried some show commands but no clue : ------------------------------------------------------------------- R9#show int ser 0/2/0 Serial0/2/0 is up, line protocol is up Hardware is GT96K Serial MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation FRAME-RELAY, loopback not set Keepalive set (10 sec) CRC checking enabled LMI enq sent 108, LMI stat recvd 109, LMI upd recvd 0, DTE LMI up LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0 LMI DLCI 1023 LMI type is CISCO frame relay DTE FR SVC disabled, LAPF state down Broadcast queue 0/64, broadcasts sent/dropped 3/0, interface broadcasts 0 Last input 00:00:07, output 00:00:07, output hang never Last clearing of "show interface" counters 00:19:15 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: weighted fair Output queue: 0/1000/64/0 (size/max total/threshold/drops) Conversations 0/1/256 (active/max active/max total) Reserved Conversations 0/0 (allocated/max allocated) Available Bandwidth 1158 kilobits/sec 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 130 packets input, 8510 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 115 packets output, 2444 bytes, 0 underruns 0 output errors, 0 collisions, 3 interface resets 18 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out 0 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up ---------------------------------------- R9#show int ser 0/2/0.32 Serial0/2/0.32 is down, line protocol is down Hardware is GT96K Serial Internet address is 150.50.69.9/25 MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation FRAME-RELAY CRC checking enabled Last clearing of "show interface" counters never ------------------------------------------- The R9 is connecting to R6 and here are the show commands results on R6 : R6#show int ser 0/2/0 Serial0/2/0 is up, line protocol is up Hardware is GT96K Serial MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation FRAME-RELAY, loopback not set Keepalive set (10 sec) CRC checking enabled LMI enq sent 0, LMI stat recvd 0, LMI upd recvd 0 LMI enq recvd 1107, LMI stat sent 1107, LMI upd sent 0, DCE LMI up LMI DLCI 1023 LMI type is CISCO frame relay DCE FR SVC disabled, LAPF state down Broadcast queue 0/64, broadcasts sent/dropped 195/1, interface broadcasts 0 Last input 00:00:02, output 00:00:02, output hang never Last clearing of "show interface" counters 03:08:12 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: weighted fair Output queue: 0/1000/64/0 (size/max total/threshold/drops) Conversations 0/1/256 (active/max active/max total) Reserved Conversations 0/0 (allocated/max allocated) Available Bandwidth 1158 kilobits/sec 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 1121 packets input, 15874 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 1308 packets output, 81164 bytes, 0 underruns 0 output errors, 0 collisions, 6 interface resets 0 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out 43 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up --------------------------------- R6#show int ser 0/2/0.32 Serial0/2/0.32 is up, line protocol is up Hardware is GT96K Serial Internet address is 150.50.69.6/25 MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation FRAME-RELAY CRC checking enabled Last clearing of "show interface" counters never
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