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CISCO 2 Chapter 3: Dynamic Routing

Terms in this set (42)

RIP protocol
updated to RIPv2 to accommodate growth in the network environment
Border Gateway Protocol
BGP definition
Dynamic routing protocol
purpose of this includes
-discovery of remote networks
-maintaining up-to-date routing information
-choosing the best path to destination networks
-ability to find a new best path if the current path is no longer available
Dynamic Routing Protocol Components
Data structures
Routing protocol messages
algorithms
Data structures
tables or databases kept in RAM
Routing protocol messages
to discover neighboring routers, exchange routing information, adn maintain accurate information about the network
algorithms
to facilitate learning routing information and for best path determination
static routing
used as follows:
-for easy routing table maintenance in small networks
-routing to and from a stub network
-accessing a single default route
dynamic routing
best choice for large networks
help the network administrator manage the network:
-providing redundant paths
-automatically implementing the alternate path when a link goes down
RIPv2
does not scale to current larger network implementations
automatically summarizes networks at major network boundaries
router rip
command to enable RIP v1
no router rip command
to disable RIP
network network-address
router configuration mode command which enables RIP on all interfaces that belong to a specific network
advertises the network in RIP routing updates sent to other routers every 30 seconds
RIPv1
classful routing protocol for IPv4
show ip protocols
displays IPv4 routing protocols configured on the router
command to verify that RIPv2 is configured
show ip route
displays RIP routes installed in the routing table
command to verify the RIPv2 routes in the routing table
version 2
router configuration mode command to enable RIPv2
no auto-summary
router configuration mode command to disable auto summarization
show ip protocols
command to verify that auto summarization is off
RIP updates
are forwarded out all RIP-enabled interfaces by default
only need to be sent out interfaces that are connected to other RIP-enabled routers
Sending RIP updates to LANs
wastes bandwidth, wastes resources, and is a security risk
passive-interface
router configuration command to stop routing updates out the interface
still allows that network to be advertised to other routers
default-information originate
router configuration command instructs R1 to send the default static route information in the RIP updates
Directly Connected Networks (C)
automatically added to the routing table when the interface is configured and activated
route source
how the route was learned
destination network
remote network
outgoing interface
exit interface used to forward packets to destination
the exit interface to use to forward the packet
Route source
how route was learned
administrative distance (AD)
trustworthiness of the route
metric
value assigned to reach the remote network. lower is better
next hop
IPv4 address of the next router that the packet should be forwarded to
route timestamp
time since the route was updated
routing table
hierarchical structure that is used to speed up the lookup process when locating routes and forwarding packets
routing table hierarchy
-ultimate routes
-level 1 routes
-level 1 parent routes
-level 2 child routes
ultimate route
a routing table entry that contains either a next-hop IPv4 address or an exit interface
directly connected, dynamically learned, and local routes
network route
a network route that has a subnet mask equal to that of the classful mask (level 1 route)
supernet route
A network address with a mask LESS THAN the classful mask, for example, a summary address
default route
a static route with the address 0.0.0.0/0
parent route
a Level 1 network route that is subnetted
provides a heading for the specific subnets it contains in the routing table
contain level 2 child routes
level 2 child route
a route that is a subnet of a classful network address.
are also ultimate routes
best match
route in the routing table that has the most number of far left matching bits with the destination IPv4 address of the packet
show ipv6 route
command to display the IPv6 routing table
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