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Monitoring router interfaces status.

I am in search of finding a (possibly open source or cisco's own) utility that would generate alerts (sms or email etc) in real time as and when any of the Router interfaces goes down on line protocol or the interface itself. I need to basically monitor my ISP provided ATM/T1 lines.
The routers are all 2800 series with FE gigabit interfaces.

How can I got about it? Pls advise!!
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Using Nagios (http://www.nagios.org/), zabbix (http://www.zabbix.com/) or zenoss (http://www.zenoss.com/), as well as other tools (there tools are rather known) you can monitor devices and spring alerts. While Nagios is the older and common product, others are interesting by themselves. You can use SNMP traps on the Cisco device, or you can use SNMP polling on the monitoring system side. Both will work.
What type of access to these devices do you have?  Can you do SNMP queries to them?   Can you configure them to send SNMP alerts?

If so then you can use the tools that ezton has listed.

fahimAuthor Commented:
giltjr, are their any solutions that would enable me to monitor my interfaces if I do not have requisite privileges to configure snmp on the router?

Pls advise!!
What is your setup?

   Your 2800 <-- Ethernet --> Local ISP Router <-- T1 --> Remote ISP Router


   Your 2800 <-- T1 --> Remote ISP Router

"Local ISP Router" is a router that is owned and managed by your ISP, but located within your building.
"Your 2800" is the 2800 that you own and manage.
"Remote ISP Router" is a router that is owned and managed by your ISP and is located at one of their sites.

Depending on which setup you have you may have very limited options.  Off hand one would be to setup something that will ping the "Remote ISP Router" every 5 minutes or so from within your building.  When the pings fail, you have problems.

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