at network routing function may be occurred dynamically or statically
Static routing :
you are administering a large network.
: In as much as its a complex task, there are
benefits of static routes
Bandwidth usage between router is at a
minimum, none in some cases.
There is no overhead on the router CPU.
It adds security due to choice of
route configuration by the administrator.
It reduces the amount of routes found
in the routing table.
Disadvantages
of Static Routes:
Takes
too much man hours for configuration especially in a large network.
Too
complex and can sometime be confusing during troubleshooting.
ip route command
{destination network address} {mask} {next hop address
or exit interface}#
for example
If we need to static route for destination 172.16.10.0 (pc5,pc6,pc7) from source 192.168.30.0 (pc1,pc2.pc3). What shall I do
Remember the Static Router command syntax:
Ip route {destination network
address} {mask} {next hop address or exit interface}
:Static Route configuration on HQ router
HQ(config)#ip route 172.16.10.0 255.255.255.0 se2/0
HQ(config)#interface se2/0
HQ(config-if)#clock rate 64000
-----------------------------------------
Bandwidth usage between
router is at a minimum, none in some cases.
ii. There is no overhead on the router CPU.
iii. It adds security due to choice of route configuration by the administrator.
iv. It reduces the amount of routes found in the routing table.
Disadvantages of Static Routes:
i. Takes too much man hours for configuration especially in a large network.
ii. Too complex and can sometime be confusing during troubleshooting.
- See more at: http://orbit-computer-solutions.com/How-to-Configure-Static-Routes.php#sthash.huUJPMcQ.dpufBandwidth usage between router is at a minimum, none in some cases.
ii. There is no overhead on the router CPU.
iii. It adds security due to choice of route configuration by the administrator.
iv. It reduces the amount of routes found in the routing table.
Disadvantages of Static Routes:
i. Takes too much man hours for configuration especially in a large network.
ii. Too complex and can sometime be confusing during troubleshooting.
- See more at: http://orbit-computer-solutions.com/How-to-Configure-Static-Routes.php#sthash.huUJPMcQ.dpufBandwidth usage between router is at a minimum, none in some cases.
ii. There is no overhead on the router CPU.
iii. It adds security due to choice of route configuration by the administrator.
iv. It reduces the amount of routes found in the routing table.
Disadvantages of Static Routes:
i. Takes too much man hours for configuration especially in a large network.
ii. Too complex and can sometime be confusing during troubleshooting.
- See more at: http://orbit-computer-solutions.com/How-to-Configure-Static-Routes.php#sthash.huUJPMcQ.dpufBandwidth usage between router is at a minimum, none in some cases.
iii. It adds security due to choice of route configuration by the administrator.
iv. It reduces the amount of routes found in the routing table.
Disadvantages of Static Routes:
i. Takes too much man hours for configuration especially in a large network.
ii. Too complex and can sometime be confusing during troubleshooting.
- See more at: http://orbit-computer-solutions.com/How-to-Configure-Static-Routes.php#sthash.huUJPMcQ.dpufBandwidth usage between router is at a minimum, none in some cases.
ii. There is no overhead on the router CPU.
iii. It adds security due to choice of route configuration by the administrator.
iv. It reduces the amount of routes found in the routing table.
Disadvantages of Static Routes:
i. Takes too much man hours for configuration especially in a large network.
ii. Too complex and can sometime be confusing during troubleshooting.
- See more at: http://orbit-computer-solutions.com/How-to-Configure-Static-Routes.php#sthash.huUJPMcQ.dpuf
iii. It adds security due to choice of route configuration by the administrator.
iv. It reduces the amount of routes found in the routing table.
Disadvantages of Static Routes:
i. Takes too much man hours for configuration especially in a large network.
ii. Too complex and can sometime be confusing during troubleshooting.
- See more at: http://orbit-computer-solutions.com/How-to-Configure-Static-Routes.php#sthash.huUJPMcQ.dpuf
Dynamic
routing : shows how routers can
discover this information automatically and share that information with other
routers via dynamic routing protocols. A routing protocol is the language a router speaks with other routers in order
to share information about the reach ability and status of networks.
: Dynamic routing metrics
Hop count: A hop count metric simply counts router hops
Bandwidth: A bandwidth metric would choose
a higher-bandwidth path over a lower-bandwidth link. However, bandwidth by
itself still may not be a good metric.
Reliability: reliability metrics are based on
known qualities of a link as determined by the network administrator. The path
with highest reliability would be selected as best.
Delay: Delay is a measure of the time a packet
takes to traverse a route. A routing protocol using delay as a
metric would choose the path with the least delay as the best path.
metric would choose the path with the least delay as the best path.
Load: This metric reflects the amount of traffic utilizing the links along the path. The best path is the one with the lowest load.
Cost : best path is the lowest cost
( cost = FN ( metrics
( cost = FN ( metrics
Convergence : A dynamic routing protocol must include a set of procedures for a router to inform other routers about its directly connected networks, to receive and process the same information from other routers, and to pass along the information it receives from other routers. Further, a routing protocol must define a metric by which best paths may be determined.
Load balancing: the practice of distributing traffic among multiple paths to the same destination in order to use bandwidth efficiently.
show route command
show ip route #
Ip
route {destination network address} {mask} {next hop
address or exit interface} - See more at:
http://orbit-computer-solutions.com/How-to-Configure-Static-Routes.php#sthash.huUJPMcQ.dpuf
: Dynamic routing protocols
(Classifying
Routing Protocols (3.1.4.1
Routing
protocols can be classified into different groups according to their
characteristics. Specifically, routing protocols can be classified by their:
- (Purpose: Interior
Gateway Protocol (IGP) or Exterior Gateway Protocol (EGP
- Operation: Distance vector
protocol, link-state protocol, or path-vector protocol
- Behavior: Classful
(legacy) or classless protocol
- For example, IPv4 routing protocols are classified as follows:
- RIPv1 (legacy): IGP, distance
vector, classful protocol
- IGRP (legacy): IGP, distance
vector, classful protocol developed by Cisco (deprecated from 12.2 IOS and
later)
- RIPv2: IGP, distance
vector, classless protocol
- EIGRP: IGP, distance
vector, classless protocol developed by Cisco
- OSPF: IGP,
link-state, classless protocol
- IS-IS: removed from ccna coursel
- BGP: removed from ccna course
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