Routing Protocols
Chapters 8-9
Networking Essentials – Eric Vanderburg © 2005
RIP


Version 1








15 max hop count
Broadcasts routing updates (30 secs)
Distance vector
Classfull
Hop count m...
RIP commands


Router rip
Network network address
 Version 2 (optional)


Debug ip rip
 Passive-interface serial0 – do...
IGRP
Distance vector
 Metric uses bandwidth & delay
 Bandwidth is based on the lowest speed
link in the route.
 Broadca...
IGRP commands


Router igrp as#



Network network number
Debug ip igrp transactions – shows updates
Debug ip igrp event...
Distance Vector
Route Poisoning – send infinite metric
 Split Horizon – do not send out updates
from interfaces in which ...
OSPF (Open Shortest Path First)









Link state
Keeps a topology database
Best route is calculated using the S...
OSPF commands


Router ospf processID


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

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Network ipaddress mask area areaID

Ip ospf cost cost – cost for a...
Integrated IS-IS
(Intermediate System to Intermediate System)

Link state
 Created by ISO
 Supports multiple layer 3 pro...
Link State
Sends updates when link state changes
 Everyone keeps a database of the entire
AS
 Shorter convergence time
...
EIGRP (Enhanced Interior
Gateway Routing Protocol)
Hybrid protocol (balanced hybrid)
 DUAL (Diffusing Update Algorithm)
...
EIGRP (Enhanced Interior
Gateway Routing Protocol)
Sends partial updates
 Supports authentication
 Same metric as IGRP *...
EIGRP commands


Router EIGRP AS#

Network network number mask
 Maximum-paths # - number of routes to
same network store...
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CCNA Routing and Switching Lessons 08-09 - Routing Protocols - Eric Vanderburg

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CCNA Routing and Switching Lessons 08-09 - Routing Protocols - Eric Vanderburg

  1. 1. Routing Protocols Chapters 8-9 Networking Essentials – Eric Vanderburg © 2005
  2. 2. RIP  Version 1       15 max hop count Broadcasts routing updates (30 secs) Distance vector Classfull Hop count metric Version 2     255 max hop count Multicasts routing updates Classless (supports VLSM) Supports authentication (MD5)
  3. 3. RIP commands  Router rip Network network address  Version 2 (optional)  Debug ip rip  Passive-interface serial0 – does not send out RIP updates from this interface 
  4. 4. IGRP Distance vector  Metric uses bandwidth & delay  Bandwidth is based on the lowest speed link in the route.  Broadcasts route every 90 secs  Classfull  Cisco proprietary  Grouped into AS 
  5. 5. IGRP commands  Router igrp as#  Network network number Debug ip igrp transactions – shows updates Debug ip igrp events – shows all igrp packets  
  6. 6. Distance Vector Route Poisoning – send infinite metric  Split Horizon – do not send out updates from interfaces in which we received those updates  Poison reverse (Cisco only) – send infinite metric to all devices  Hold down timer – does not update routes for an infinite metric route for a certain amount of time 
  7. 7. OSPF (Open Shortest Path First)         Link state Keeps a topology database Best route is calculated using the SPF algorithm Converges in about 10 secs Classless Uses hello messages to determine if a link is down Sends LSA’s (Link State Advertisements) when a link changes Grouped into AS (areas)
  8. 8. OSPF commands  Router ospf processID        Network ipaddress mask area areaID Ip ospf cost cost – cost for an interface Bandwidth bandwidth – for interface Ip ospf hello # - hello interval Show ip ospf neighbor – shows those with whom you share updates Debug ip ospf events – show ospf packets Debug ip ospf hello – show hello messages
  9. 9. Integrated IS-IS (Intermediate System to Intermediate System) Link state  Created by ISO  Supports multiple layer 3 protocols (ISIS did not)  Advertises CLNP (Connectionless Network Protocol) routes as well as IP routes. 
  10. 10. Link State Sends updates when link state changes  Everyone keeps a database of the entire AS  Shorter convergence time  More processing required  Unicast updates are sent to a DR (Designated Router) & BDR (Backup Designated Router) to save bandwidth.  DR multicasts to the rest of the AS 
  11. 11. EIGRP (Enhanced Interior Gateway Routing Protocol) Hybrid protocol (balanced hybrid)  DUAL (Diffusing Update Algorithm)  uses less processing than SPF  Calculates alternate routes as well (successor / feasible successors) – can switch immediately  Converges in 3 seconds  Cisco proprietary  Classless 
  12. 12. EIGRP (Enhanced Interior Gateway Routing Protocol) Sends partial updates  Supports authentication  Same metric as IGRP * 256  Compatible with IGRP  Grouped into AS 
  13. 13. EIGRP commands  Router EIGRP AS# Network network number mask  Maximum-paths # - number of routes to same network stored in routing table  Show ip eigrp neighbors – show those you share updates with  Show ip route eigrp – show only eigrp routes  Show ip eigrp topology – show successors and feasible sucecssors 
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