IP Sla monitor operations - with multiple IPs reachability
We have two ISP routers connected to two different ISP, and on routers lan interface we are running HSRP, so one router will be active at a time and traffic will be forwarded to that router A and respective ISP. Also we notice when router A next hop is unreachable and same ethernet WAN interface is showing UP, therefore HSRP is not failing back.
To avoid the above situation, we configured IP SLA as like below
int fa 0/0 (LAN)
standby 1 track 1 shutdown
ip sla 1 icmp-echo x.x.x.x source-ip y.y.y.y ip sla schedule 1 life forever start-time now
Where x.x.x.x is next hop IP (ISP end) and y.y.y.y is fa 0/1 interface IP (Fa0/1)
This solution worked sucessfully, primary router HSRP went to standby and secondary router came ACTIVE.
Here sometimes we are face issue in internet reachablility but my next hop will be UP. Due this HSRP was not falling back.
To avoid this scenario, we need to monitor reachability of next hop as well as internet, so please suggest any options there.
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