Cisco router issue

TofuMofu

TofuMofu

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Hi all

Have any of you encountered an issue where the Broadband connection (Broadlink Wireless in this case) drops frequently even if a different Cisco router is used?

It has to be a Cisco issue though as we swapped the Cisco out with a Fortigate 60D and it works, but the problem is we need to figure out what the issue is with the Cisco's. Could it be firmware?

I'm stumped by this.

Thanks
 
can you post the config of the cisco so that we can maybe identify the issue?
 
I would've upgraded the firmware first before asking :D
 
Agreed, post config.
What logs do you get when the connection drops?
Does the interface flap, mac flap etc
 
We had a similar issue on a Broadlink wireless link, they changed their MTU size on their router and that solved it, but ja, maybe post config, could be something else in your case
 
envo said:
I would've upgraded the firmware first before asking :D
Click to expand...

Very sensitive customer and we only found the issue to be on the Cisco yesterday after replacing it.

Don't want to disconnect them to test if not a little sure :p
 
syntax said:
Agreed, post config.
What logs do you get when the connection drops?
Does the interface flap, mac flap etc
Click to expand...

It doesn't. The connection stays up, but no traffic can pass over it, that is why at first we thought it's a transmission issue.
 
Method said:
Very sensitive customer and we only found the issue to be on the Cisco yesterday after replacing it.

Don't want to disconnect them to test if not a little sure :p
Click to expand...

At least check what version they are on then you can see if they are up to date, or how many versions behind.
 
Right, firmware was updated to the latest available and the connection still dropped.

I also simplified the config to make sure there's nothing weird in it.

current config:

Building configuration...

Current configuration : 2443 bytes
!
! Last configuration change at 10:32:33 UTC Tue May 12 2015
!
version 15.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname host
!
boot-start-marker
boot system flash0:c1900-universalk9-mz.SPA.154-3.M2.bin
boot-end-marker
!
!
enable secret 5
!
no aaa new-model
memory-size iomem 15
!
!
!
!
!
!
!
!
!
!
!
!
!
!


!
ip dhcp excluded-address 172.30.154.33
ip dhcp excluded-address 172.30.154.35
ip dhcp excluded-address 172.30.154.43
ip dhcp excluded-address 172.30.154.34
!
ip dhcp pool IP-POOL
network 172.30.154.32 255.255.255.224
default-router 172.30.154.33
dns-server 172.30.152.55 172.30.152.95
lease 8
!
!
!
ip cef
no ipv6 cef
multilink bundle-name authenticated
!
!
chat-script gsm "" "atdt*98*1#" TIMEOUT 180 "CONNECT"
cts logging verbose
!
!
license udi pid CISCO1941/K9 sn FCZ162870LN
license boot module c1900 technology-package datak9
!
!
!
redundancy
!
!
controller Cellular 0/0
!
!
class-map match-any MPLS
match access-group name MPLS
!
policy-map MPLS
class MPLS
set precedence 3
class class-default
set precedence 0
!
!
!
!
!
interface Embedded-Service-Engine0/0
no ip address
shutdown
!
interface GigabitEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface GigabitEthernet0/0.100
bandwidth 1024
encapsulation dot1Q 100
ip address 10.99.100.90 255.255.255.252
service-policy output MPLS
!
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface GigabitEthernet0/1/0
no ip address
!
interface GigabitEthernet0/1/1
no ip address
!
interface GigabitEthernet0/1/2
no ip address
!
interface GigabitEthernet0/1/3
no ip address
!
interface Cellular0/0/0
no ip address
encapsulation ppp
dialer in-band
dialer string gsm
!
interface Cellular0/0/1
no ip address
encapsulation ppp
!
interface Vlan1
ip address 172.30.154.33 255.255.255.224
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip route 0.0.0.0 0.0.0.0 10.99.100.89
!
ip access-list extended MPLS
permit ip any any
!
!
!
!
control-plane
!
!
!
line con 0
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport output lat pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line 0/0/0
script dialer gsm
no exec
line 0/0/1
no exec
line vty 0 4
login
transport input all
!
scheduler allocate 20000 1000
!
end
Click to expand...

Connection drops a lot for a few seconds and then comes back up again.

Logs doesn't show connection drop at all. Interfaces stay up

64 bytes from 10.99.100.90: icmp_seq=3178 ttl=255 time=14.909 ms
64 bytes from 10.99.100.90: icmp_seq=3179 ttl=255 time=15.686 ms
64 bytes from 10.99.100.90: icmp_seq=3180 ttl=255 time=13.649 ms
64 bytes from 10.99.100.90: icmp_seq=3181 ttl=255 time=21.479 ms
64 bytes from 10.99.100.90: icmp_seq=3182 ttl=255 time=18.171 ms
64 bytes from 10.99.100.90: icmp_seq=3183 ttl=255 time=12.352 ms
^C
--- 10.99.100.90 ping statistics ---
3302 packets transmitted, 2759 packets received, 16% packet loss
round-trip min/avg/max/stddev = 9.425/25.235/4790.150/133.112 ms
 
config looks fine to me unless i am missing something. You say logs don't show the connection dropping? maybe it's a connection cable between the CPE and Cisco?

Have you tried a capture with wireshark at all?
 
Nope was going to, but the customer no longer wants us to do tests to find the issue and we have no other cases like this.
 
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