Post on 21-Dec-2015
RD-CSY2001-08/09
Characteristics of Distance Vector Routing protocols. Network discovery process using Routing Information
Protocol (RIP). Identify the conditions leading to a routing loop and
explain the implications for router performance. Recognize that distance vector routing protocols are in use
today
RD-CSY2001-08/09
Function(s) of Dynamic Routing Protocols:◦ Dynamically share
information between routers.
◦ Automatically update routing table when topology changes.
◦ Determine best path to a destination.
RD-CSY2001-08/09
Criteria used to compare routing protocols includes Time to convergence Scalability Resource usage Implementation & maintenance
RD-CSY2001-08/09
Two Main Approaches Distance Vector Protocols
◦ E.g., RIP (Routing Information Protocol) Link State Protocols
◦ E.g., OSPF (Open Shortest Path First) Our Focus
◦Distance Vector Protocols - RIP
RD-CSY2001-08/09
A router using distance vector routing protocols knows 2 things:
Distance to final destination
Vector, or direction, traffic should be directed
RD-CSY2001-08/09
Characteristics Periodic updates Triggered updates Exchange information
with Neighbors Entire routing
table is included with routing update
RD-CSY2001-08/09
Triggered Updates◦Conditions in which
triggered updates are sent Interface changes state Route becomes
unreachable Route is placed in
routing table
RD-CSY2001-08/09
Initial Exchange of Routing Information◦ If a routing protocol is configured
then routers will exchange routing information
Routing updates received from other routers◦ Router checks update for new
information If there is new information
Metric is updated New information is stored in
routing table
RD-CSY2001-08/09
Regular Time Intervals in which a router sends out its entire routing table to its neighbours.
RD-CSY2001-08/09
Exchange of Routing Information◦ Router convergence is
reached when All routing tables in the
network contain the same network information
◦ Routers continue to exchange routing information If no new information is
found then Convergence is reached
RD-CSY2001-08/09
• Using router rip and network commands to • enable RIP.
• Enabling RIP on an IP-addressed network.
• Monitoring IP packet flow using the show IP • protocol command.
• The show ip route command.
RD-CSY2001-08/09
• debug ip rip• show ip rip database • show ip protocols {summary} • show ip route • debug ip rip {events} • show ip interface brief