Monitor active WAN interface on Cisco 881 router with SNMP

[Peter Herczeg]

Dear All,

We are implementing small site WAN connections (DMVPN) with Cisco881G-K9 routers.  

As a primary connection we use DSL / Leased Line connections on WAN interface (Fa4), and we use 3G sim cards as backup.

If primary connection is down, IPSec VPN tunnel is being rebuilt with 3G (Cellular0 if), and it keeps the VPN connection while the main line is recovered.

If primary connection is up again, VPN tunnel is being rebuilt again, but with primary connection. 

As we have several sites, we don't have resources to monitor manually that whether those routers use primary / backup lines, and need to start incident management on primary lines if those ISP connection is down as soon as possible, to avoid slow 3G speed, and usage of data limit on SIM cards. 

Is that possible, to monitor Cisco881G routers via SNMP or Syslog to know if WAN interface change is made, and which is active currently?

The best solution would be to forward this info to Solarwinds, and get some email notification about VPN tunnel up / down changes, and reasons.

Thanks in advance,

regards,

Peter

[Tagir Temirgaliyev]

I think it is possible to make both tunnels up. 2 static routes. 3g with bigger metric.

so router will use dsl tunnel and in case dsl fail router will use 3g. instead of static routing also possible routing protocol like ospf. ip sla also possible as well as embedded event manager

[Peter Herczeg]

Thank you, but it is working already.

We only need the extra function: to have notification about changes in case of failure of dsl line via SNMP or Syslog.

[Tagir Temirgaliyev]

using  embedded event manager I think it is possible even send sms from 3g router in case of interface down or you need some special software to analyse syslog and send email alerts

[Peter Herczeg]

thanks. SMS is also a good idea. The best option would be to find the SNMP MIBs for this part of router, and read it out somehow...