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How to Troubleshoot Multilink 2nd serial interface

Posted on 2008-10-15
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Last Modified: 2012-06-27
I have established a Multilink configuration between two T1 circuits, however, the second serial interface keeps going down. I have tested over and over with the carrier and the circuit is good. I have replaced cableing, replaced WIC Cards, and reviewed configuration. Any suggestions?

Cisco is sugestion RMA of the 3745
***************************************************************************************************
Cisco 2801 Config:
interface Multilink1
 ip address 10.100.30.1 255.255.255.0
 ppp multilink
 ppp multilink group 1
!
interface FastEthernet0/0
 description connected to Georgian residents & DR site
 ip address 10.10.10.1 255.255.255.0
 ip helper-address 10.10.31.15
 ip helper-address 10.10.31.55
 duplex auto
 speed auto
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/1/0
 description connection 1 to Corp 3745
 no ip address
 encapsulation ppp
 fair-queue
 ppp multilink
 ppp multilink group 1
!
interface Serial0/2/0
 description connection 2 to Corp3745
 no ip address
 encapsulation ppp
 fair-queue
 ppp multilink
 ppp multilink group 1
!
interface Serial0/3/0
 description connection 2 to Corp 3745
 no ip address
 encapsulation ppp
 shutdown
 no fair-queue
!
router eigrp 5
 network 10.0.0.0
 no auto-summary
 no eigrp log-neighbor-changes
!
**************************************************************************
Cisco 3745:
controller T1 0/1
 framing esf
 clock source internal
 linecode b8zs
 channel-group 0 timeslots 1-24 speed 64
!
controller T1 0/2
 framing esf
 clock source internal
 linecode b8zs
 channel-group 0 timeslots 1-24 speed 64
!
controller T1 0/3
 framing esf
 clock source internal
 linecode b8zs
 channel-group 0 timeslots 1-24 speed 64
!
controller T1 0/4
 framing esf
 clock source internal
 linecode b8zs
 channel-group 0 timeslots 1-24 speed 64
!
!
interface Multilink1
 ip address 10.100.30.2 255.255.255.0
 ppp multilink
 ppp multilink group 1
!
interface FastEthernet0/0
 ip address 10.10.2.1 255.255.255.0
 duplex auto
 speed auto
!
interface Serial0/0
 description connection 2 to Georgian
 no ip address
 encapsulation ppp
 fair-queue
 service-module t1 clock source internal
 ppp multilink
 ppp multilink group 1
!
interface FastEthernet0/1
 description connection to corp18-2621
 ip address 10.10.30.1 255.255.255.0
 ip helper-address 10.10.31.15
 ip helper-address 10.10.31.55
 speed auto
 full-duplex
!
interface Serial0/1:0
 description connection 1 to Georgian
 no ip address
 encapsulation ppp
 fair-queue
 ppp multilink
 ppp multilink group 1
!
interface Serial0/2:0
 description connected to MPWI1720
 ip address 10.100.50.1 255.255.255.0
 encapsulation ppp
!
interface Serial0/3:0
 description connect to M-NP
 ip address 10.100.70.1 255.255.255.0
 encapsulation ppp
!
interface Serial0/4:0
 description TM Sales Office
 ip address 10.100.90.2 255.255.255.0
 ip helper-address 10.10.31.15
 ip helper-address 10.10.31.55
 priority-group 4
!
interface FastEthernet1/0
 ip address 10.10.31.1 255.255.255.0
 ip helper-address 10.10.31.15
 ip helper-address 10.10.31.55
 duplex auto
 speed auto
!
interface Serial1/0
 description connected to MPAV1720
 ip address 10.100.40.1 255.255.255.0
 encapsulation ppp
 service-module t1 clock source internal
 service-module t1 remote-alarm-enable
!
interface FastEthernet1/1
 ip address 10.10.32.1 255.255.255.0
 duplex auto
 speed auto
!
interface Serial1/1
 no ip address
 shutdown
 no fair-queue
!
router eigrp 5
 redistribute static
 network 10.0.0.0
 no auto-summary
 no eigrp log-neighbor-changes

*******************************************************************************
Show int 2801:
Serial0/1/0 is up, line protocol is up
  Hardware is GT96K with integrated T1 CSU/DSU
  Description: connection 1 to Corp 3745
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 125/255, rxload 248/255
  Encapsulation PPP, LCP Open, multilink Open
  Link is a member of Multilink bundle Multilink1, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 19:39:51
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair  [suspended, using FIFO]
  FIFO output queue 1/40, 0 drops
  5 minute input rate 1504000 bits/sec, 231 packets/sec
  5 minute output rate 759000 bits/sec, 221 packets/sec
     15574213 packets input, 1097661186 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
     13839087 packets output, 1085983868 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up

Serial0/2/0 is up, line protocol is down
  Hardware is GT96K with integrated T1 CSU/DSU
  Description: connection 2 to Corp3745
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, LCP REQsent, multilink Closed, loopback not set
  Keepalive set (10 sec)
  Last input 01:35:40, output 00:00:01, output hang never
  Last clearing of "show interface" counters 19:39:52
  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  0/18/256 (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
     7721637 packets input, 3425316370 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 1 giants, 0 throttles
     4 input errors, 4 CRC, 3 frame, 2 overrun, 0 ignored, 3 abort
     6371639 packets output, 1800410312 bytes, 0 underruns
     0 output errors, 0 collisions, 2012 interface resets
     0 output buffer failures, 0 output buffers swapped out
     2 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up

Multilink1 is up, line protocol is up
  Hardware is multilink group interface
  Internet address is 10.100.30.1/24
  MTU 1500 bytes, BW 1544 Kbit, DLY 100000 usec,
     reliability 255/255, txload 125/255, rxload 248/255
  Encapsulation PPP, LCP Open, multilink Open
  Open: CDPCP, IPCP, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 2 seconds on reset
  Last input 00:00:00, output never, output hang never
  Last clearing of "show interface" counters 19:39:54
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 41307
  Queueing strategy: fifo
  Output queue: 11/40 (size/max)
  5 minute input rate 1503000 bits/sec, 232 packets/sec
  5 minute output rate 760000 bits/sec, 222 packets/sec
     16188763 packets input, 121624091 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
     15133084 packets output, 2886381072 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

**********************************************************************************************
Show int 3745:

Serial0/0 is down, line protocol is down
  Hardware is GT96K with integrated T1 CSU/DSU
  Description: connection 2 to Georgian
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, LCP Closed, multilink Closed, loopback not set
  Keepalive set (10 sec)
  Last input 01:37:05, output 01:37:07, output hang never
  Last clearing of "show interface" counters 16:57:10
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2
  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
     5849757 packets input, 1646271676 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     1 input errors, 1 CRC, 1 frame, 1 overrun, 0 ignored, 1 abort
     7209101 packets output, 3266285036 bytes, 0 underruns
     3 output errors, 0 collisions, 1013 interface resets
     0 output buffer failures, 0 output buffers swapped out
     7 carrier transitions
     DCD=down  DSR=up  DTR=up  RTS=up  CTS=down

Serial0/1:0 is up, line protocol is up
  Hardware is GT96K Serial
  Description: connection 1 to Georgian
  MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
     reliability 255/255, txload 250/255, rxload 127/255
  Encapsulation PPP, LCP Open, multilink Open, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:00, output 00:00:02, output hang never
  Last clearing of "show interface" counters 16:57:32
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair  [suspended, using FIFO]
  FIFO output queue 0/40, 0 drops
  5 minute input rate 771000 bits/sec, 224 packets/sec
  5 minute output rate 1506000 bits/sec, 238 packets/sec
     11635350 packets input, 123959025 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
     13301748 packets output, 3839599192 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
  Timeslot(s) Used:1-24, SCC: 2, Transmitter delay is 0 flags

Multilink1 is up, line protocol is up
  Hardware is multilink group interface
  Internet address is 10.100.30.2/24
  MTU 1500 bytes, BW 1536 Kbit, DLY 100000 usec,
     reliability 255/255, txload 250/255, rxload 130/255
  Encapsulation PPP, LCP Open, multilink Open
  Open: CDPCP, IPCP, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 2 seconds on reset
  Last input 00:00:01, output never, output hang never
  Last clearing of "show interface" counters 16:58:22
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 294662
  Queueing strategy: fifo
  Output queue: 39/40 (size/max)
  5 minute input rate 784000 bits/sec, 220 packets/sec
  5 minute output rate 1507000 bits/sec, 234 packets/sec
     12878716 packets input, 1695742308 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
     13874540 packets output, 2704796776 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
*************************************************************************************************
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Question by:csankovich1
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4 Comments
 
LVL 7

Expert Comment

by:willbaclimon
ID: 22723953
I perform circuit installs on a weekly basis..If you already completed the steps stated...I would has the LEC to re-terminate the jack. If its a extended dmark, re-terminate that aswell


Also if you switch the t-1 from interface Serial0/1/0 to interface Serial0/2/0 does it work>?
0
 

Author Comment

by:csankovich1
ID: 22724073
At the site with the Cisco 2801 there is a patch cable about 15' between the smartjack and the router. The cable has been replaced 3 times.

Yes, we have moved the T1 from serial0/3/0 to Serial0/2/0 (not exactly what you asked).

At the Cisco 3745 end, is a DS3 with an Adtran MX2800 that multiplexes the circuit. I though of having the carrier move the T1 to a different channel, but had tested the circuit with a spare router and it stayed up with no errors.

That is when Cisco said they would replace the 3745 router.
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LVL 7

Accepted Solution

by:
willbaclimon earned 2000 total points
ID: 22724200
Yes so if you swapped cables from each slot and got the same result on the same slot, then I would try a ios upgrade for kicks..and rma it
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Author Comment

by:csankovich1
ID: 22770935
RMA was for: CISCO3745-CHAS+MP
IOS upgrade not needed.
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