Re: Router 819G - Auto-switch & failover between two Cellular Ne

Claudio Cubillos · ‎04-17-2012

Hi all,

I have a Cisco 819G WAN Router with the following specifications:

Router3G#show inventory

NAME: "C819G+7-K9 chassis", DESCR: "C819G+7-K9 chassis"

PID: C819G+7-K9 , VID: V01 , SN: xxxxxxxxxxx

NAME: "C819 Mother board on Slot 0", DESCR: "C819 Mother board"

PID: C819G+7-K9 , VID: V01 , SN: xxxxxxxxxxx

NAME: "Modem 0 on Cellular0", DESCR: "Sierra Wireless Mini Card MC8705 HSPA+R7 modem"

PID: 8705 , VID: 1.0, SN: xxxxxxxxxxx

and employee Cisco IOS Software, C800 Software (C800-UNIVERSALK9-M), Version 15.1(4)M3, RELEASE SOFTWARE (fc1)

The router have dual SIM enabled from diferents ISPs, and I use secesfully the following chat-script for both:

chat-script gsm "" "AT!SCACT=1,1" TIMEOUT 60 "OK"

After the device power on, the Dial-In is successful for SIM 0 (Profile 1) obtaining an IP address by DHCP, and the Profile 2 (Inactive) is associated to SIM 1.

Router3G#show cell 0 profile

Profile 1 = ACTIVE*

--------

PDP Type = IPv4

PDP address = A.B.C.D

Access Point Name (APN) = imovil.entelpcs.cl

Authentication = CHAP

Username: xxxxxxx, Password: xxxxxxx

Primary DNS address = 200.63.56.3

Secondary DNS address = 200.63.56.5

Profile 2 = INACTIVE

--------

PDP Type = IPv4

Access Point Name (APN) = web.tmovil.cl

Authentication = CHAP

Username: web, Password: web

* - Default profile

Configured default profile for active SIM 0 is profile 1.

Router3G#

My current problem is that I tryied to simulate a conenction fault, e.g. termination by mobile provider, but the router dont switch-over into the second profile in order to start a new Dial-In with the second ISP.

I attached at following the current configuration:

Router3G#show running-config

Building configuration...

Current configuration : 2831 bytes

!

! Last configuration change at 00:31:05 UTC Wed Apr 18 2012

! NVRAM config last updated at 00:02:54 UTC Wed Apr 18 2012

version 15.1

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

service internal

!

hostname Router3G

!

boot-start-marker

boot-end-marker

!

enable secret 5 $1$Qr5C$q3BTcNUQzx9.oL7BRpK0k/

!

no aaa new-model

!

crypto pki token default removal timeout 0

!

ip source-route

ip cef

!

ip dhcp excluded-address 192.168.31.209

!

ip dhcp pool SomeDHCPpool

import all

network 192.168.31.208 255.255.255.240

default-router 192.168.31.209

dns-server 4.2.2.2

!

ip domain name XYZ.com

no ipv6 cef

!

multilink bundle-name authenticated

chat-script gsm "" "AT!SCACT=1" TIMEOUT 60 "OK"

license udi pid C819G+7-K9 sn FTXxxxxxxx

!

no spanning-tree vlan 1

username engineer password 0 cisco

!

controller Cellular 0

gsm sim profile 2 slot 1

gsm sim max-retry 65535

gsm failovertimer 1

!

ip ssh version 2

!

interface Cellular0

ip address negotiated

ip flow ingress

ip flow egress

ip nat outside

ip virtual-reassembly in

encapsulation slip

dialer in-band

dialer idle-timeout 2147483

dialer string gsm

dialer-group 1

async mode interactive

!

interface FastEthernet0

description "Internal LAN"

no ip address

!

interface FastEthernet1

no ip address

!

interface FastEthernet2

no ip address

!

interface FastEthernet3

no ip address

!

interface GigabitEthernet0

no ip address

shutdown

duplex auto

speed auto

!

interface Serial0

no ip address

shutdown

clock rate 2000000

!

interface Vlan1

ip address 192.168.31.209 255.255.255.240

no ip redirects

no ip unreachables

no ip proxy-arp

ip flow ingress

ip nat inside

ip virtual-reassembly in

ip tcp adjust-mss 1452

!

ip forward-protocol nd

no ip http server

no ip http secure-server

!

ip nat inside source route-map nonat interface Cellular0 overload

ip route 0.0.0.0 0.0.0.0 Cellular0

!

access-list 1 permit any

access-list 131 remark ***** NAT ACL *****

access-list 131 deny ip 192.168.31.208 0.0.0.15 10.0.1.0 0.0.0.255

access-list 131 permit ip 192.168.31.208 0.0.0.15 any

dialer-list 1 protocol ip list 1

!

route-map nonat permit 10

match ip address 131

!

control-plane

!

line con 0

exec-timeout 0 0

password cisco

login

line aux 0

line 3

script dialer gsm

login

modem InOut

no exec

transport input all

rxspeed 21600000

txspeed 5760000

line vty 0 4

login local

transport input all

!

end

I realy appreciate any comment in order to enable Dual-SIM switch over

mavespig · ‎04-17-2012

Hi Claudio,

can you post the full 'show cell 0 all', and also collect these debugs while the failover should occur:

- deb chat

- deb dialer

- deb ppp nego

I can see that the profile should be already associated with the SIM: gsm sim profile 2 slot 1

The failover should start after a minute, be sure to run the debugs long enough.

How do you simulate the failure on the main SIM?

On a side note, there are a couple of config lines that should be corrected:

interface Cellular0

encapsulation slip <<<< It should be PPP.

dialer idle-timeout 2147483 <<< why a value so high? If you want the timeout to be disabled, just use 0

line 3

rxspeed 21600000

txspeed 5760000 <<< these two commands are unnecessary, you can't see the 3G speed manually

Hope this helps

Marco

Claudio Cubillos · ‎04-18-2012

Marco

Please find attached the requested show commands:

Router3G#show cellular 0 all

Hardware Information

====================

Modem Firmware Version = T1_0_3_2AP R361 CNSZ

Modem Firmware built = 04/15/11

Hardware Version = 1.0

International Mobile Subscriber Identity (IMSI) = 730011165268140

International Mobile Equipment Identity (IMEI) = 357115040062080

Integrated Circuit Card ID (ICCID) = 89560100000318181407

Mobile Subscriber International Subscriber

IDentity Number (MSISDN) =

Factory Serial Number (FSN) = CC3239101641007

Modem Status = Online

Current Modem Temperature = 33 deg C, State = Normal

PRI SKU ID = 9900198, SKU Rev. = 1.2

Profile Information

====================

Profile 1 = ACTIVE*

--------

PDP Type = IPv4

PDP address = 186.10.C.D

Access Point Name (APN) = imovil.entelpcs.cl

Authentication = CHAP

Username: entelpcs, Password: entelpcs

Primary DNS address = 200.63.56.4

Secondary DNS address = 200.63.56.6

Profile 2 = INACTIVE

--------

PDP Type = IPv4

Access Point Name (APN) = web.tmovil.cl

Authentication = CHAP

Username: web, Password: web

* - Default profile

Configured default profile for active SIM 0 is profile 1.

Data Connection Information

===========================

Data Transmitted = 3049738 bytes, Received = 9733990 bytes

Profile 1, Packet Session Status = ACTIVE

IP address = 186.10.7.145

Primary DNS address = 200.63.56.4

Secondary DNS address = 200.63.56.6

Negotiated QOS Parameters:

Precedence = Normal Priority, Delay = Class 2

Reliability = Unack GTP, LLC, Ack RLC, Protected data

Peak = 256 kB/sec, Mean = 50000 kB/hr

Traffic Class = Interactive

Uplink Max = 2048kbps, Guaranteed = 16kbps

Downlink Max = 2048kbps, Guaranteed = 64kbps

Max SDU size = 1500 bytes

SDU error ratio = 1E-4, BER = 1E-5

Profile 2, Packet Session Status = INACTIVE