Here is a handy way to use EEM to failover to a second ISP – use with a route-map:<\/p>\n
Cisco EEM configuration:<\/strong><\/p>\n event manager applet BGP_ISP_DOWN IP SLA Configuration:<\/strong><\/p>\n ip sla 1 —- Multiple objects can also be tracked by means of a list, using a\u00a0 flexible method for combining objects with Boolean logic. This\u00a0 functionality includes:<\/p>\n – Boolean AND function\u2014When\u00a0 a tracked list has been assigned a Boolean AND function, each object\u00a0 defined within a subset must be in an up state, so that the tracked\u00a0 object can also be in the up state.<\/p>\n – Boolean OR function\u2014When\u00a0 the tracked list has been assigned a Boolean OR function, it means that\u00a0 at least one object defined within a subset must also be in an up\u00a0 state, so that the tracked object can also be in the up state.<\/p>\n If you need both hosts down for the tracked object to be down then you need a boolean OR because if you take the truth table for AND it is: But the OR is: Here is a handy way to use EEM to failover to a second ISP – use with a route-map: Cisco EEM configuration:<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[83,67],"tags":[],"_links":{"self":[{"href":"http:\/\/darenmatthews.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1741"}],"collection":[{"href":"http:\/\/darenmatthews.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/darenmatthews.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/darenmatthews.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/darenmatthews.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1741"}],"version-history":[{"count":4,"href":"http:\/\/darenmatthews.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1741\/revisions"}],"predecessor-version":[{"id":1943,"href":"http:\/\/darenmatthews.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1741\/revisions\/1943"}],"wp:attachment":[{"href":"http:\/\/darenmatthews.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1741"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/darenmatthews.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1741"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/darenmatthews.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1741"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nevent track 1 state down
\naction 1.0 cli command “enable”
\naction 1.1 cli command “conf t”
\naction 1.2 cli command “no ip prefix-list own-prefix seq 10 permit 10.10.10.0\/24”
\naction 1.3 cli command “ip prefix-list own-prefix-backup seq 15 permit 10.10.10.0\/24”
\naction 1.4 syslog msg “BGP peer ISP1 down 10.10.10.0\/24 now through ISP2”<\/p>\n
\nicmp-echo x.x.x.x source-interface GigabitEthernet0\/1.101
\ntimeout 15000
\nfrequency 15
\nip sla schedule 1 life forever start-time now
\n!
\ntrack 1 rtr 1
\ntrack 2 rtr 2
\ntrack 2\u00a0 list boolean or
\nobject 1
\nobject 2
\nevent manager applet BGP_ISP_DOWN
\nevent track 3 state down<\/p>\n
\nIP SLA for multiple hosts:<\/p>\n
\n1 and 1 = 1
\n1 and 0 = 0
\n0 and 1 = 0
\n0 and 0 = 0<\/p>\n
\n1 or 1 = 1
\n1 or 0 = 1
\n0 or 1 = 1
\n0 or 0 = 0<\/p>\n","protected":false},"excerpt":{"rendered":"