11-28-2007 03:11 AM - edited 03-03-2019 07:42 PM
Hello NetPros,
As anyone come across issues where a serial connection (say s0/1) going down, tend to bring down another serial connection.
The scenerio is that, say RouterA has 2 serial interfaces s0/1 and s0/2. s0/1 is a ppp connection via a V100 satellite link, and s0/2 is a frame-relay connection with several subinterfaces ... Say s0/2.1,s0/2.2,s0/2.3,s0/2.4,s0/2.5 etc.
The problem is, whenever s0/1 goes down, it takes s0/2 main interface down with it, which in turn take down all the sub-interfaces with it.
Is there any reason why this should be, I'm guessing hardware related fault on the Hub Router, or a software bug ... Anyone come across this, please let me know.
!
interface Serial0/1
bandwidth 512
ip address A.B.C.D W.X.Y.Z
encapsulation ppp
ip route-cache flow
no fair-queue
no cdp enable
!
!
interface Serial0/2
bandwidth 2048
no ip address
encapsulation frame-relay IETF
ip route-cache flow
no ip route-cache cef
frame-relay traffic-shaping
frame-relay lmi-type ansi
frame-relay interface-queue priority 10 20 30 40
!
interface Serial0/2.1 point-to-point
bandwidth 128
ip address B.B.C.D W.X.Y.Z
no cdp enable
frame-relay interface-dlci 1
class 64k_cir_128k_bc
!
interface Serial0/2.2 point-to-point
bandwidth 128
ip address B.B.C.E W.X.Y.Z
no cdp enable
frame-relay interface-dlci 2
class 64k_cir_128k_bc
!
interface Serial0/2.3 point-to-point
bandwidth 128
ip address B.B.C.F W.X.Y.Z
no cdp enable
frame-relay interface-dlci 3
class 64k_cir_128k_bc
!
!
interface Serial0/2.4 point-to-point
bandwidth 128
ip address B.B.C.G W.X.Y.Z
no cdp enable
frame-relay interface-dlci 4
class 64k_cir_128k_bc
!
interface Serial0/2.5 point-to-point
bandwidth 128
ip address B.B.C.H W.X.Y.Z
shutdown
no cdp enable
frame-relay interface-dlci 5
class 64k_cir_128k_bc
!
interface Serial0/2.6 point-to-point
bandwidth 256
ip address B.B.C.I W.X.Y.Z
no cdp enable
frame-relay interface-dlci 6
class 128k_cir_256k_bc
!
interface Serial0/2.7 point-to-point
bandwidth 128
ip address B.B.C.J W.X.Y.Z no cdp enable
frame-relay de-group 1 7
frame-relay interface-dlci 7 IETF
class 64k_cir_128k_bc_inc_2_voice
vofr data 4 call-control 5
frame-relay payload-compression FRF9 stac
!
interface Serial0/2.8 point-to-point
bandwidth 32
no cdp enable
frame-relay interface-dlci 8
class 56k_cir_7k_bc_2_voice
vofr data 5 call-control 4
!
Many Thanks
Yemi Salau
11-28-2007 03:50 AM
Yemi
Some additional information would be helpful. What platform is this running on? Are both serial interfaces on the same card (from the interface addressing I would assume so)? What kind of card is it? Does it happen all the time that if serial0/1 goes down that serial0/2 also goes down or is it sometimes?
HTH
Rick
11-28-2007 04:01 AM
Thanks Rick,
Here is a sh ver:
Cisco IOS Software, 3700 Software (C3745-JSX-M), Version 12.3(7)T, RELEASE SOFTW
ARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2004 by Cisco Systems, Inc.
Compiled Sat 21-Feb-04 05:53 by eaarmas
ROM: System Bootstrap, Version 12.2(8r)T2, RELEASE SOFTWARE (fc1)
RouterA uptime is 6 weeks, 17 hours, 32 minutes
System returned to ROM by reload at 19:32:39 bst Tue Oct 16 2007
System restarted at 19:35:03 bst Tue Oct 16 2007
System image file is "flash:c3745-jsx-mz.123-7.T.bin"
Cisco 3745 (R7000) processor (revision 2.0) with 116736K/14336K bytes of memory.
Processor board ID JHY0753K01M
R7000 CPU at 350MHz, Implementation 39, Rev 3.3, 256KB L2, 2048KB L3 Cache
2 FastEthernet interfaces
6 Serial(sync/async) interfaces
1 ATM interface
8 Voice FXO interfaces
DRAM configuration is 64 bits wide with parity disabled.
151K bytes of NVRAM.
31744K bytes of ATA System CompactFlash (Read/Write)
Configuration register is 0x2102
***************************************************
1. Yes, Both Serial interfaces are on the same module. Hardware is GT96K Serial WIC
2. This happen all the time if s0/1 goes down due to various reasons like weather(since it's a satellite V100 link), then s0/2 will go down as well.
Cheers
Yemi
11-28-2007 04:13 AM
Yemi
Thank you for the additional information. I find it very unusual that the second interface always goes down if the first one goes down, especially for reasons such as weather affecting satellite. If serial0/2 goes down does it take down serial0/1?
I would be inclined to open a case with TAC if there is a maintenance contract on this router. If a TAC case is not possible I would try upgrading the software on the possibility that it might be a software issue.
HTH
Rick
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