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Check this routing table

track 1 ip route 10.46.52.5 255.255.255.255 reachability
ip route 10.1.0.0 255.255.128.0 10.243.222.1 track 1
ip route 10.1.128.0 255.255.128.0 10.243.222.1 track 1
ip route 0.0.0.0 0.0.0.0 10.11.70.2 name FW_INTERNET
ip route 10.1.3.211 255.255.255.255 GigabitEthernet0/0.10 tag 20
ip route 10.1.5.1 255.255.255.255 GigabitEthernet0/0.10 tag 20

In the first route what does reachability mean?

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2 Answers 2

up vote 1 down vote accepted

it just checking connectivity...

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reachability is not part of the routing table, but of an object tracking instruction. It checks whether the route is reachable (see here).

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What does it mean? If is available send the packets go through there? –  Ricardo Polo Apr 27 '12 at 15:11
    
It will not send any packets. It will simply check if it is in the routing table and if its next hop is also reachable. –  Oliver Apr 27 '12 at 15:14
    
A why is it checked? If this next hop is available what decision does it takes? or is simply for logging? Thank you @Oliver –  Ricardo Polo Apr 27 '12 at 15:32
    
It could be for logging, but also for other actions like, for example, activating a secondary interface. –  Oliver Apr 27 '12 at 15:43
    
in this case only make a check or where is the action? –  Ricardo Polo Apr 27 '12 at 16:02

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