Hi all, I have a Cisco 819G WAN Router with the following specifications: Model: Cisco C819HG+7-K9 (Compact Hardened 3G IOS Router with GLOBAL HSPA+ 3GPP Release 7) Software: Cisco IOS Software, C800 Software (C800-UNIVERSALK9-M), Version 15.2(3)T, RELEASE SOFTWARE (fc1) 4 FastEthernet interfaces 1 Gigabit Ethernet interface 1 Serial(sync/async) interface 1 terminal line 1 Virtual Private Network (VPN) Module 1 Cellular interface DRAM configuration is 32 bits wide 255K bytes of non-volatile configuration memory. 254464K bytes of ATA System CompactFlash (Read/Write) Modem Firmware Version = T1_0_3_2AP R361 CNSZ Modem Firmware built = 04/15/11 Hardware Version = 1.0 NAME: "Modem 0 on Cellular0", DESCR: "Sierra Wireless Mini Card MC8705 HSPA+R7 modem" The router have dual SIM enabled from different ISPs , and both connection worked successfully. Also, it have no problem to failover/auto-switch to secondary SIM when primary SIM is totally down or terminated by mobile provider. My current problem is that I tried to simulate an Auto-switch & Fail-over between two Cellular Network (ISPs) based on their "signal quality" . I want like this : When primary SIM connection is not good (Bad coverage), then it will auto switch to secondary SIM (different ISP). I have setup an IPSEC VPN in 819 router that connect back to my DC. As you know, VPN connection is very sensitive to connection quality. If the primary SIM network has bad signal quality and higher latency, then the VPN will goes down that will affect/suspend any transaction that currently going through the VPN. Cisco failover mechanism only works when the SIM is totally down or no connection at all but not on poor signal. I heard that we can use IPSLA + EEM script but i have no enough understanding on that. But i need someone help me to create the script based on my brief idea as below : 1. Create IPSLA that will ping to one of the host in DC through VPN. eg. ip sla 1 icmp-echo 192.168.1.254 source-interface Vlan1 2. If the ping failed in certain amount of threshold, then we know that the VPN is DOWN. (VPN can't up due to bad signal quality) 3. Then, EEM script will do its magic by switch/failover to another SIM. Does anyone have any idea to create an IPSLA + EEM script to work around this issue ? Thanks!!!
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