DYNAMIC ROUTING CONFIGURATIONS

DYNAMIC ROUTING CONFIGURATIONS

DYNAMIC ROUTING PROTOCOL CONFIGURATIONS

FUNCTIONS OF DYNAMIC ROUTING:

• Dynamically share information between routers.
• Automatically update routing table when topology changes.
• Determine best path to a destination.
• Ability to find a new best path if the current path is no longer available.

Dynamic routing protocols are grouped according to characteristics.  Examples include: RIP, OSPF, and EIGRP.

Their basic configuration commands are as follows, they will be explained in detail in later chapters.

RIPv1

Router (config) # router rip

Router (config-router) # network <directly-connected-classful-network-address>

• It enables the sending and receiving of RIP updates for interfaces that belong to the specified network.

RIPv2

Router (config) # router rip

Router (config) # version 2

Router (config) # no auto-summary

Router (config-router) # network <directly-connected-classful-network-address>

• It enables the sending and receiving of RIPv2 updates for interfaces that belong to the specified network.
• Once automatic summarization has been disabled, RIPv2 will no longer summarize networks to their classful address at boundary routers.

EIGRP

Router (config) # router eigrp <AS number>

Router (config) # network <network address> <wild-card mask>

• The first global command is to move the user into EIGRP configuration mode for the listed ASN.
• EIGRP router subcommand that matches either all interfaces in a classful network or a subset of interfaces based on the ACL-style wildcard mask, enabling EIGRP on those interfaces.

OSPF

Router (config) # router ospf <process-id>

Router (config) # network <network address> <wild-card mask>

• Enters OSPF configuration mode for the listed process with process-id which is locally significant, having range (1 – 65535).
• The network address along with the wildcard mask is used to specify the interface or range of interfaces that will be enabled for OSPF using this network command.