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How to configure primary and secondary default routes with ICMP probe for dual connected ISP routes on S/K/7100-Series

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TitleHow to configure primary and secondary default routes with ICMP probe for dual connected ISP routes on S/K/7100-Series
Objective
How to configure primary and secondary default routes with ICMP probe for dual connected ISP routes on S/K/7100-Series
Environment
  • 7100-Series
  • S-Series
  • K-Series
  • Firmware 8.0.2.X and higher
Procedure
     1. Configure an ICMP Probe, for example:
configure
probe Backup-ISP icmp
faildetect count 2 interval 5
passdetect count 2 interval 5
inservice
exit
exit
The probe will mark a "fail" after 2 failed ping attempts 5 seconds apart, and the same with the "pass" which indicates a successful connection
     
     2. The following default route configuration will use 192.168.0.2 as long as both 8.8.8.8 and 4.2.2.2 are reachable, however if both ICMP requests timeout the next-hop 192.168.0.50 will be used until pings return:
configure
ip route 0.0.0.0/0 8.8.8.8 recursive 1 probe Backup-ISP
ip route 0.0.0.0/0 4.2.2.2 recursive 2 probe Backup-ISP
ip route 8.8.8.8/32 192.168.0.2
ip route 4.2.2.2/32 192.168.0.2
ip route 0.0.0.0/0 192.168.0.50 3
exit
Additional notes
WARNING:  If using OSPF, BGP, or any other dynamic routing protocol, be cautious that you are NOT redistributing static routes as it may have negative consequences. The default route redistribution for 0.0.0.0 with next-hop of 8.8.8.8, or even the static routes to 8.8.8.8 or 4.2.2.2 will not have valid next-hops on downstream / remote routers. 

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