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14 Cards in this Set
- Front
- Back
Level 1 routes
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- used to speed up the lookup process when locating routes.
-Level 1 route is a route with subnet mask equal or less than the classful mask of the network address. |
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commands for routing
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debug ip routing
show ip route |
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functions of level 1 route
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-default route (static route with address 0.0.0.0/0)
-supernet route - network addressw with a mask less than the classful mask -network route - subnet mask is equal that of the classful mask. Network route can also be a parent route |
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Ultimate route
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route that includes
next hop IP address and/or exit interface |
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example of a level 1 network route
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-directly connected network b/c it has a subnet mask same as the classful mask and it has an exit interface
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parent route
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-does not contain next hop IP or exit information. It is usually added when the child is added.
-Parent route is just to indicate that there is a child route. |
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Child route/level 2 route
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-a route that is a subnet of a classful network address.
-They are also considered ultimate routes |
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variably subnetted parent route
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when there are two or more child routes with different subnet masks belonging to the same classful network.
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router lookup process
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-first look at level 1 routes including nework routes, supernet route fore the best match.
-if a best match is a level1 ultimate route, it's used. -if the best match is a parent route: -looks at child routes of that parent -if no match, go to: -check if the route is using classful or classless routing -if classful -drop the packet -if classless - continue searching level 1 supernet routes. -if there is a lesser match, use that. - if no match is found, drop the packet. |
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what is a best matched route
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- the destination IP and the route should have a minimum of left most bits that match.
-the route IP should have atleast the number of matching bits indicated by the subnet mask. |
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example of best matched route
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dest IP 172.16.0.10
-routes: 172.16.0.0/12, 172.16.0.0/18 and 172.16.0.0/26. Twenty six bits from 172.22.0.0 matches the dest and thus the match is 172.16.0.0/26 |
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classfull and classless behavior
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is different than classful and classless routing protocols. They determine how the routing table is searched after being populated.
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how are they independent
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-a routing table can be populated with a classless routing protocol such as RIPv2 and a classful routing behaviour b/c the no ip classless is configured.
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configure classful and classless behavior
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ip classless -default
no ip classless (classful) 8.3.3.2 |