Distance Vector Routing Protocols
The meaning of Distance Vector:
A router using distance vector routing protocols knows 2 things:
Distance to final destination.
Vector, or direction, traffic should be directed.
RIP uses hop count as the metric for path selection.
If hop count for a network is greater then 15, RIP cannot supply a route to that network.
IGRP/EIGRP use Bandwidth, delay, load and reliability for path selection.
EIGRP can perform unequal cost load balancing.
EIGRP uses Diffusing Update Algorithm (DUAL) to calculate the shortest path.
EIGRP only sends updates when there is a change in the topology.
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Tags: 802.1q, guides, router, cisco, switch, interface
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Dynamic Routing Protocols:
Dynamic routing helps the admin overcome the time-consuming process of configuring and maintaining static routes.
Routing protocols have been used since the early 80s.
Routing algorithms have been in use since 1969.
Some function(s) of Dynamic Routing Protocols:
Dynamically share information between routers.
Automatically update routing table when topology changes.
Determine best path to a destination.
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Tags: vtp, vlan, switch, study, router, guides
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Static Routing & CDP
By admin 05 September 2008 at 10:46 pm and have Comments Off
Introducing the Topology:
The show controllers command reveals whether the cable is DCE or DTE.
#show controllers serial 0/0/0
Interface serial0/0/0
Hardware is powerQUICC MPC860
DCE v.35, no clock
Interfaces:
By default all Serial and Ethernet interfaces are down.
The routing table will be empty.
Debugging:
Allows us to watch changes a router performs in real time.
For example, to observe routes being added and removed.
#debug ip routing
#undebug all (disables all debug commands). or
#no debug all. or
#un a. (short form)
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Tags: 802.1q, study, vlan, switch, vtp, wan
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Configuring a Web Interface:
Switches have web-based config tools that require an onboard HTTP server:
Web browser GUI.
Security Device Manager (SDM).
IP Phone and Telephony apps.
HTTP services ? security hole ? optional authentication.
If many users access HTTP services you may require a separate authentication server.
AAA and TACACS can be used to validate user credentials, (robust).
A less complex method allows use of the enable password.
A local authentication method requires the user to use a login username and password specified in the config.
S1(config)#ip http server ? turns on the server (on by default).
S1(config)#ip http authentication enable.
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Tags: wan, switch, cisco, router, vtp, study
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Key Elements of Ethernet Networks:
CSMA/CD – Only used with half-duplex (hubs).
Full-duplex switches do not use CSMA/CD.
Ethernet signals are sent to every host in the LAN.
Carrier Sense:
All devices must listen before transmitting.
If signal detected (CS), wait before transmitting.
If no tfc detected, can transmit.
While transmitting – must listen for collisions.
Multi-access:
If 2 devices transmit at the same time = collision.
Collision Detection:
Other devices (not involved in collision), and transmitting devices, detect collision.
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Tags: study, vtp, 802.1q, guides, switch, cisco
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