Eem script monitor routing table - multiple entries into 1 email

Question

I have the following script running to report on routing table changes
event manager applet route-table-monitor
event routing network 0.0.0.0/0 ge 1
action 0.5 set msg "Route changed: Type: $_routing_type, Network: $_routing_network, Mask/Prefix: $_routing_mask, Protocol: $_routing_protocol, GW: $_routing_lastgateway, Intf: $_routing_lastinterface"
action 1.0 syslog msg "$msg"
action 2.0 cli command "enable"
action 4.0 info type routername
action 5.0 mail server "10.*.*.*" to "roger.perkin@****" from "Switch1" subject "Routing Table Change" body "$msg  $_cli_result"
It works perfectly however if multiple routes change I get multiple emails.
Last night we had a site go out and I got about 20 separate email for each subnet change.
What I would like to do is get this script to take all routes changed in a 1 minute interval and then output them into an email.
Not quite sure how I would go about that?
Thanks
Roger
Currently studying for my CCIE and just started on EEM, have not done much scripting before so this is all good stuff to know.

Answer 1

You can't do this with one policy.  However, you could accomplish this with a timer policy that will batch up the pending updates, though.  Something like this would work.
event manager applet route-table-monitor event routing network 0.0.0.0/0 ge 1 action 0.5 set msg "Route changed: Type: $_routing_type, Network:  $_routing_network, Mask/Prefix: $_routing_mask, Protocol:  $_routing_protocol, GW: $_routing_lastgateway, Intf:  $_routing_lastinterface" action 0.6 syslog msg "$msg" action 1.0 handle-error type ignore action 2.0 context retrieve key RTRCTXT variable msgs action 3.0 if $_error ne FH_EOK action 4.0  set msgs "$msg\n" action 5.0 else action 6.0  append msgs "$msg\n" action 7.0 end action 8.0 handle-error type exit action 9.0 context save key RTRCTXT variable msgs!event manager applet route-table-batcher event timer watchdog time 60 action 1.0 handle-error type ignore action 2.0 context retrieve key RTRCTXT variable msgs action 3.0 if $_error eq FH_EOK action 4.0  info type routername action 5.0  mail server "10.*.*.*" to "roger.perkin@****" from "$_info_routername" subject "Routing Table Change" body "$msgs" action 6.0 end action 7.0 handle-error type exit