Please find the below show interface result of Layer 3 switch Port. Currently loopback not set to this interface. Please let me know how can i set the loopback to this particualr interface since loopback command not shown under this interface
sh int gigabitEthernet 0/23
GigabitEthernet0/23 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is a40c.c398.4541 (bia a40c.c398.4541)
Internet address is 10.1.1.1/30
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 179/255, rxload 190/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:07:17, output 00:00:07, 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: fifo
Output queue: 0/40 (size/max)
5 minute input rate 74662000 bits/sec, 119491 packets/sec
5 minute output rate 70380000 bits/sec, 112017 packets/sec
287620166072 packets input, 22568453574431 bytes, 0 no buffer
Received 4601 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
274063186698 packets output, 21663572341938 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
ip address 10.1.1.1 255.255.255.252
SWITCH(config)#int gigabitEthernet 0/23
l2protocol-tunnel lacp link load-interval logging
The loopback command is used on WAN interfaces.
It is not suported on normal ethernet interfaces. There are some ethernet SPA modules supporting it
Really you are confusing us too......how could you configure loopback inside an Gig port.........
If you really want to configure loopback address then what about
SWITCH(config)#interface loopback 0
SWITCH(config-if)#ip add .............
If you mean to say anything else plz let me know....
Thanks for your replies.
Actually, I saw loopback commad is supported on router ethernet interfaces. As you can see the above configuration we are using this partlicular port as layer 3 therfefore i expect it should support the same command on it.
Per my understanding, Ethernet OAM needs to be supported inorder to perform CFM or any loopback testing on ethernet ports. I remember working on 7600 platforms.
What platform and IOS version are you trying it?.
I saw loopback command is shown under vlan interface but i need to set a particular Layer3 port.
SWITCH(config)#int vlan 1
link load-interval logging loopback
Also, I need to perform remote loopback since there is no engineer at colo side to perform the hard loop.
Here are the IOS details:
I guess you may facing some P2P link issue with ISP, loopback on CKT always going to use by your ISP, what they do, they set soft loop or hard loop at your last mile ISP provided device after that you will get "loopback set" on sh interface command which is not showing currently
post that you may try ping your own IP for checking purpose, this is troubleshooting process for checking error on CKT, please concern to your ISP and they will guide you accordingly.
I am looking for the same set of commands for a Cat 6500 switch
As I am no expert I was wondering if someone could explain to me what each type of loopback does
What I want is to run a test from the next hop component which in this case is a Genband MGW 4 port Gigabit Ethernet card to the Cisco 6500 switch and then back so that I can run a externalDataPath test on the Genband MediaGateway 15000 Passport.
| M |+-tx----rx-+|++ C |
| G | | | 6 |
| W |+-rx----tx-+|++ 5 |
+--+ | 0 |
| 0 |
Given my example above should I use
(config-if)# loopback internal
(config-if)# loopback mac
(config-if)# loopback driver
(config-if)# loopback external
Any help would be appreciated.