02-13-2009 07:29 AM - edited 03-04-2019 03:33 AM
interface Serial0/2:0
bandwidth 1544
ip address x.x.x.x
encapsulation ppp
ip ospf network point-to-point
ip ospf cost 9999
ip ospf hello-interval 15
no fair-queue
can I do a loopback on the interface to trblsht the T1 line w/ out having telco involved ?
02-13-2009 07:42 AM
Sure, under controller T1 you can set loopbacks as required. Note, usually that is not necessary, because 99.9% of the times, you will find that the router works, but the circuit doesn't.
Unrelated, you don't need any of the OSPF commands you have, neither disabling fair-queuing is a good thing.
02-13-2009 07:47 AM
Hello Ocporbust,
the interface is derived from a controller T1.
you can verify if the controller T1 supports a loopback command in controller config mode.
Otherwise you need to build a loopback plug for T1/E1 over RJ45.
see
http://www.stayonline.com/detail.aspx?ID=205
and
http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a00800a754b.shtml#csudsu_hw
Hope to help
Giuseppe
02-13-2009 09:41 AM
r1#show int se0/1:0
Serial0/1:0 is up, line protocol is down
r1#w#config t
Enter configuration commands, one per line. End with CNTL/Z.
r1#(config)#inter Serial0/1:0
r1#(config-if)#loopback
Loopback is a traffic-affecting operation
r1#(config-if)#do ping x.x.x.x
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to x.x.x., timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
x.x.x.x is the Ip of the interface.. s0/1:0
Now I was told to chng the encap to HDLC ..I did that still times out..
02-13-2009 09:48 AM
Hello Octorbust,
as Paolo and I have noted these interfaces are not independent when you see serx/y:0 means they are generated by configuring an unframed channel group under
controller t1 0/x
so the loopback command with several options available has to be given in controller context.
I would suggest you to try in this way.
Hope to help
Giuseppe
02-13-2009 09:59 AM
Giuseppe and Paolo hello again
I have int 0/0 is up/up
there are other interfaces let say 0/4:0 and 0/3:0 that are up /up
this is 3750 router and it is in production.. can you please provid me w/ the steps on how to do that .. I do not want to cause any issue w/ network..
Thanks
02-13-2009 10:08 AM
Hello Ocporbust,
each interface ser0/x:0 comes from a different T1 controller (unless you have a DS3 channelized interface) so you can configure
controller t1 0/0
loopback
without disturbing the other T1 controllers unless they derive their clock from it
post
sh ver
sh network-clocks
Hope to help
Giuseppe
02-13-2009 10:29 AM
#show network-clocks
Network Clock Configuration
---------------------------
Priority Clock Source Clock State Clock Type
10 Backplane GOOD PLL
Current Primary Clock Source
---------------------------
Priority Clock Source Clock State Clock Type
10 Backplane GOOD PLL
==================================
show service-module
Interface Serial0/0
Module type is T1/fractional
====================================
02-13-2009 10:08 AM
Hi,
as mentioned above, it's likely a fault in the circuit, and you cannot do anything about it. Alert SP and have it fixed.
02-13-2009 10:26 AM
P--
you know how the isp are , I'v been working on this since yestrday and all they are saying is that they test from smartjack to smartjack and all looks good . now I am in the postion where I need to show them that its indeed a ckt ... I do not have lot of knowlege about T1 and networking.. I have enough to do little ..
02-13-2009 10:33 AM
I know how they are - unable to diagnose in most cases. Invite them on premises again and watch the test with your eyes.
This happens thousand of times everyday,do not worry.
02-13-2009 10:38 AM
I am still looking for the steps that will help me set up a loopback LOL..
Thanks
02-13-2009 11:24 AM
conf t
controller t1 x/y
shutdown
loopback local
no shutdown
If your circuit is faulty, you will not "see" the loopback on the other side.
02-16-2009 11:54 AM
I had to do it different
config t
router ospf1
passive-interface serial0/1:0
=========================
router ospf 1
router-id x.x.x.x
log-adjacency-changes
limit retransmissions non-dc 255
passive-interface Serial0/1:0
then go to inter serial0/1:0 and no encp ppp.
now I am only working w/ inter-s0/1:0 with out effecting the trafic on s0/0 since this intface is on passive mode
Then I can go and set the loopback
Thanks for teaching me what you know
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