Backup interface for the frame-relay in R6

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R6#conf ter

Enter configuration commands, one per line. End with CNTL/Z.

R6(config)#int s0/0/1

R6(config-if)#ip add 122.1.56.6 255.255.255.0

R6(config-if)#no sh

R6(config-if)#exit

R6(config)#int s0/0/0

R6(config-if)#backup interface s0/0/1

R6(config-if)#^Z


To test the backup interface command use one of the follwing actions:

1. – Disconnect cable.

2. – In HDLC or PPP Encapsulation types, you must shutdown the side of the link that does not have the backup interface command configured. you can also change the encapsulation on only one side to create an encapsulation mismatch.

3. – on Frame-Relay Physical Interface you must shutdown the interface on Frame Relay switch that is connected to the router with the backup interface command configured. Or you can simple shutdown the sub interface on the side without backup command configured.

On Frame-relay is sub interfaces are configured once the DLCI goes inactive the sub interface will go into the down

state. if it is a multipoint sub interface and has more than one DLCI then all DLCIs have to go inactive.

Another alternative is to change the lmi type to simulate a down circuit and bring up the backup interface. 

R6#show int s0/0/1

Serial0/0/1 is standby mode, line protocol is down

Hardware is GT96K Serial

Internet address is 122.1.56.6/24

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input 00:09:05, output 00:09:07, output hang never

Last clearing of “show interface” counters never

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

564 packets input, 38535 bytes, 0 no buffer

Received 564 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

563 packets output, 38496 bytes, 0 underruns

0 output errors, 0 collisions, 8 interface resets

0 output buffer failures, 0 output buffers swapped out

7 carrier transitions

DCD=down DSR=down DTR=down RTS=down CTS=down

R6#show int s0/0/0

Serial0/0/0 is up, line protocol is up

Hardware is GT96K Serial

Internet address is 122.1.1.6/24

Backup interface Serial0/0/1, failure delay 0 sec, secondary disable delay 0 sec,

kickin load not set, kickout load not set

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation FRAME-RELAY, loopback not set

Keepalive set (10 sec)

LMI enq sent 265, LMI stat recvd 266, LMI upd recvd 0, DTE LMI up

LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0

LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE

FR SVC disabled, LAPF state down

Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of “show interface” counters 00:44:31

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

271 packets input, 6359 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

273 packets output, 4270 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

R6#show backup

Primary Interface Secondary Interface Status

—————– ——————- ——

Serial0/0/0 Serial0/0/1 normal operation

R6#conf ter

Enter configuration commands, one per line. End with CNTL/Z.

R6(config)#int s0/0/0

R6(config-if)#frame-relay lmi-type cisco

R6(config-if)#do show backup

Primary Interface Secondary Interface Status

—————– ——————- ——

Serial0/0/0 Serial0/0/1 normal operation

R6(config-if)#int s0/0/0

R6(config-if)#frame-relay lmi-type ansi

R6(config-if)#^Z

R6#

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