Friday, November 8, 2013
remember routes have masks
in a couple of previous posts (bgp and old loopbacks never die), I hinted that routers allow routes with overlapping masks and will display longer mask routes by default. For example
**sho ip route 10.40.0.97
Routing entry for 10.32.0.0/11
Known via "bgp 65013", distance 20, metric 0
you see the /11 summary
however you can add the subnet mask
sho ip route 10.40.0.97 255.255.255.255
% Subnet not in table
to get a more accurate view. It is important to closely examine the results of a display to see what route is REALLY there, as was described in the loopback post routers will have a /30 and a /32 that overlap.
So use the subnet mask in the route display if it is important.
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