CCNP - t1 connection

Author

t1 connection

gindir

2001-05-21, 1:04 pm

ti connection
circuits is up
7000 router on one side
4000 router on other side
connecting by larscom multiplexer

can not make it to work

config t
int s0
ip address
no shut

please help

thanks

gindir

2001-05-21, 2:07 pm

can any one reply, does my question makes sense

g

strikeattack

2001-05-21, 6:53 pm

Is there a reason the IP address line is blank?
Also, what about layer 2 encapsulation?

Trouble Man

2001-05-22, 12:24 am

You didn't give us much to go on. If you didn't specify any encapsulation then you're using HDLC. What type of Larscom multiplexor are you using. I was looking through their site, and it looks like some were specifically designed for either frame-relay or ATM. If so, then HDLC might not work (it might though!!). I'm guessing that you have an ISDN PRI since it's T1. If that's so, the ISDN switch type must be configured on both ends.

For anybody to help you we need more info. Tell us exactly what type of routers and multiplexor you have. You know if configuring a WAN link were as simple as turning on the int and giving it an IP address, they wouldn't have or need Cisco certs.

gindir

2001-05-22, 7:22 am

Thanks Trouble Man
its mega T inverse multiplexer,can have 4 t1 lines for more bandw, encap. hdlc

vr2zjw

2001-05-22, 7:52 am

Is the line up? Is the protocol up? Show us the show interface command. Call the telco. company to check, it cost you nothing. Ask them to do local and remote loopback and show interface to see whether you see the loopback status. Is all the led normal, any red, orange, green light? Have you check the physical cable, will it be loose? Are you see the right port? Is the CSU/DSU power up? There are thousand ways that something don't work, this is where the troubleshooting skill come in to play!

gindir

2001-05-22, 7:58 am

all the connections are up and up, router interfaces stays up for few seconds and then go down, circuits are up, loopback test are done, running EIGRP on routers, after few seconds, line stays up protocol goes down. when interface is up , can not ping the interface from a local ( same ) router

Thanks for all the help

g r

Detour

2001-05-22, 9:53 am

If you won't take the time to print up configurations, why should anyone take the time to help you?

I see this on every cisco board i frequent, someone posts a "i have router. Have problem. Need help" and expect people to immediately give a solution.

gindir

2001-05-23, 9:24 am

Sorry , Detour

This is router 4700

Serial0 is up, line protocol is down
Hardware is HD64570
Description: T1 Connection Primary)
Internet address is 10.200.5.2/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 128/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input never, output 00:00:08, output hang never
Last clearing of "show interface" counters 20:41:47
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 0/3/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
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 runts, 0 giants, 0 throttles
27968 input errors, 22882 CRC, 7156 frame, 12 overrun, 152 ignored, 4546 ab
ort
7443 packets output, 185855 bytes, 0 underruns
0 output errors, 0 collisions, 2499 interface resets

This is router 7000

Serial1/3 is up, line protocol is up (looped)
Hardware is cxBus Serial
Description: T-1 Connection to 000
Internet address is 10.200.5.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input 00:00:01, output 00:00:01, output hang never
Last clearing of "show interface" counters 1y32w
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
37346 packets input, 2166867 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 114 giants, 0 throttles
2244515 input errors, 2240476 CRC, 1131 frame, 0 overrun, 0 ignored, 2794 a
bort
65417 packets output, 4790144 bytes, 0 underruns
0 output errors, 0 collisions, 14724 interface resets
0 output buffer failures, 0 output buffers swapped out
729 carrier transitions
RTS up, CTS up, DTR up, DCD up, DSR up

MadChef

2001-05-23, 1:37 pm

If your line is up/down, you're not getting keepalives on the circuit. The 4700 see's carrier, but it's not seeing anything on the other end of the circuit. Is the 7000 looped for a reason? Did you copy that output while the telco was looping towards you? The 4700 certainly isn't going to go up/up with the 7000 looped.
You also need to clear the counters on your interfaces and see if the CRCs and framing errors keep climbing. Not unexpected to see lots of errors when the counter's haven't been cleared in a year and a half.

MadChef

kerrow

2001-05-23, 1:48 pm

I agree, I think my first step would be clear the counters and see if the err's that are on your int are incrementing.

gindir

2001-05-25, 7:36 am

Thanks to every one who contributed t1 is working fine, there was one seeting on Larscom box which has to be changed.

Thanks

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