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Default Routes and Classless Addressing
mattrgee
Member Posts: 201
in CCNA & CCENT
Hi all,
I'm reading the Cisco Press ICND2 book and found a section which is a little ambiguous:
"Classful routing places one restriction on when a router can use its default route, resulting in cases in which a router has a default route, but the router chooses to discard a packet rather than forwarding the packet based on the default route"
Page 190.
Can someone expand on this, I'm yet to find a definitive answer...
Thanks in advance.
I'm reading the Cisco Press ICND2 book and found a section which is a little ambiguous:
"Classful routing places one restriction on when a router can use its default route, resulting in cases in which a router has a default route, but the router chooses to discard a packet rather than forwarding the packet based on the default route"
Page 190.
Can someone expand on this, I'm yet to find a definitive answer...
Thanks in advance.
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Optionsmattrgee
Member Posts: 201
Hmmm I think I got it.
With classful routing, the router will first check for a class A, B, C route in which the destination resides, if it doesn't find one it simply discards the packet without considering the default route.
Seems a bit harsh?