line protocol down

[Tareq Emad Al Asfoor]

hello all ... when i check the interface in Router ASR 1006 .. i see the line protocol down .... and the interface down ... what mean that ????

[Tareq Emad Al Asfoor]

please any answer ??????

[Tareq Emad Al Asfoor]

please  .. can u tell my how i can open TAC case please ??????

[Peter Paluch]

Tariq,

If you have a support contract with Cisco then you can open the TAC case directly from this thread - see the 'Actions' box on the top of page. If you do not have any support contract with Cisco then you cannot open TAC incidents and you are up to yourself and/or your Cisco partner.

Best regards,

Peter

[Giuseppe Larosa]

Hello Tariq,

as noted by Dan you have installed a special SFP on this router.

This special SFP uses only one fiber (instead of the usual fiber pair for TX and RX)  and it needs to be matched with a complementary type on the other end of the cable.

However, the router ASR 1000 may not support it.

for example the compatibility matrix for GE transceivers here

http://www.cisco.com/en/US/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6981.html#wp131775

does not provide the GLC-BX-U that should be the part numbet of this SFP for ASR 1000, but it does provide it listed in several LAN switches models.

I'm afraid you have some options:

a) you use the SFP GLC-BX-U on the Linksys that supports it and you connect the ASR 1000 with a different SFP to another port of the LAN switch.

Both ports have to be in same Vlan

b)

you contact the service provider and you try to see what they can do about this. They likely will suggest you option a)

Hope to help

Giuseppe

[Tareq Emad Al Asfoor]

dear ... i use SFP to make loop . to test the port just ... i mean i use one SFP and one fiber cable and make loop in the same port in the same SFP .... in this case i must see the line protocol and the interface up .. isn't it ???? i make loop to test only ... but when i do that the line protocol and interface still down

[Peter Paluch]

Tariq,

Doing what you did is not a particularly good idea. Assuming that your SFP has two optical jacks (Tx and Rx), you can indeed "loop" them but especially SMF modules have quite a powerful laser emittor and without an attenuator, the detector can be overloaded and possibly permanently damaged.

In addition, the Cisco switch will detect that the port is self-looped and put it into err-disabled state. You will then have to reenable it explicitly using the shutdown and no shutdown commands. It may therefore appear to you as being "down". This does not seem to be the case here, though, because an err-disabled port would be described in that way in the show interfaces output.

Best regards,

Peter

[Giuseppe Larosa]

Hello Tariq,

again this specific SFP type may be not supported in your device.

Note:

It is used in some special cases and for sure this type of SFP cannot be tested by looping the fiber because it uses a single fiber to transmit and receive

Example:

BX-U   TX  at f1  RX at f2

BX-D   RX at f1 and TX at f2

it uses two different frequencies/ or wavelengths so looping is meaningless here because the device listen at f2 and no signal is present at f2

I hope it is more clear now

not all SFPs are equal and this is really a special case

Hope to help

Giuseppe

[Tareq Emad Al Asfoor]

dear Giuseppe ...the SFP  model GIPC 1000base SX ... it have two jacks (TX, RX)

[Dan-Ciprian Cicioiu]

Hi ,

From your output :

tariqemad wrote:
GigabitEthernet2/1/0 is down, line protocol is down   Hardware is 
SPA-10X1GE-V2, address is b414.8904.1a90 (bia b414.8904.1a90)   MTU 1500
 bytes, BW 1000000 Kbit/sec, DLY 10 usec,      reliability 255/255, 
txload 1/255, rxload 1/255   Encapsulation ARPA, loopback not set   
Keepalive not supported   Full Duplex, 1000Mbps, link type is auto, 
media type is 1000BaseBX10U 

From cisco.com :

A 1000BASE-BX10-D device is always connected to a 
1000BASE-BX10-U device with a single strand of standard SMF with an 
operating transmission range up to 10 km.

On the other end what type of SPF do you use ?

Later edit : Also the 1000BaseBX SFP it's WDM.

Dan

[Tareq Emad Al Asfoor]

dear Dan .. i use one SFP to make loop for the same fiber cable to test the port ... but the line protocol and interface still down !!!!!

[Dan-Ciprian Cicioiu]

What kind of SPF modules did you used for the test ?

What equipment did you use for the test , the ASR router ?

tariqemad wrote:
dear dan ... i also try that but that not effected .. i test the fiber cable and the SFB to another Switch  Cisco linksys it work fine .... so where the problem u think ???

Other then this test ?

Dan

[Tareq Emad Al Asfoor]

dear dan .. the model GIPC 1000base SX .. it have two jacks (TX,RX )

i use ASR 1000 type 1006

[Dan-Ciprian Cicioiu]

So you had two SFPs SX , in the same

SPA module , and the TX and RX of the fiber were reversed on one end ?

When you first tested the fiber patch , who did find that the patch is ok ?

Also the SFP module.

Dan

[Tareq Emad Al Asfoor]

yeah ... i have two SFPs SX , in the same SPA module , and the TX and RX of the fiber were reversed on one end .. when i show the interface this appear to me ...........GigabitEthernet2/1/0 is down, line protocol is down   Hardware is SPA-10X1GE-V2, address is b414.8904.1a90 (bia b414.8904.1a90)   MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,      reliability 255/255, txload 1/255, rxload 1/255   Encapsulation ARPA, loopback not set   Keepalive not supported   Full Duplex, 1000Mbps, link type is auto, media type is 1000BaseBX10U   output flow-control is on, input flow-control is on   ARP type: ARPA, ARP Timeout 04:00:00   Last input never, output never, output hang never   Last clearing of "show interface" counters never   Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0   Queueing strategy: fifo   Output queue: 0/40 (size/max)   5 minute input rate 0 bits/sec, 0 packets/sec   5 minute output rate 0 bits/sec, 0 packets/sec      0 packets input, 0 bytes, 0 no buffer      Received 0 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 packets output, 0 bytes, 0 underruns      0 output errors, 0 collisions, 1 interface resets      0 unknown protocol drops      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    so where the problem ????

[Dan-Ciprian Cicioiu]

1000BaseBX10U Is not the same with 1000BaseSX

Read : A 1000BASE-BX10-D device is always connected to a  1000BASE-BX10-U device with a single strand of standard SMF with an  operating transmission range up to 10 km.

Dan