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Chapter 11

Chapter 11. Configuring Enhanced IGRP. Objectives. Upon completion of this chapter, you will be able to perform the following tasks: Describe Enhanced IGRP features and operation Configure Enhanced IGRP Verify Enhanced IGRP operation. Enhanced IGRP Operation. Enhanced IGRP Overview.

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Chapter 11

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  1. Chapter 11 Configuring Enhanced IGRP

  2. Objectives Upon completion of this chapter, you will be able to perform the following tasks: Describe Enhanced IGRP features and operation Configure Enhanced IGRP Verify Enhanced IGRP operation

  3. Enhanced IGRP Operation

  4. Enhanced IGRP Overview IP Routing Protocols IP Routing Protocols Enhanced IGRP AppleTalk RTMP AppleTalk RTMP Novell Routing Protocols Novell Routing Protocols • Enhanced IGRP supports: • Rapid convergence • Partial bounded updates • Multiple network-layer support

  5. Enhanced IGRP Convergence Network 7 • Neighbor B provides the best route to network 7 • Neighbor B is in the routing table A H B Network 7 D Neighbor Table Topology Table Routing Table Network 7 Neighbor B

  6. Partial Bounded Updates • Updates only sent to directly connected neighbor Update H Update B Update D A

  7. Neighbor Discovery Network 7 A H B D Neighbor Table Topology Table Routing Table B D H Network 7 Neighbor B

  8. Topology Table Network 7 (10) • B is current successor router • H is the feasible successor (20) G H (1) (10) A B C (10) D (100) E (100) F Network 7 7 7 Advert. Distance 21 220 30 Feasible Dist. 31 230 40 Neighbor B D H Topolog Table

  9. Feasible Successor Selection Network 7 • Router H becomes the successor (10) (20) G H (1) (10) A B C (10) D (100) E (100) F Network 7 7 7 Advert. Distance 21 220 30 Feasible Dist. 31 230 40 Neighbor B D H

  10. Active State Network 7 (10) • The route to network 7 change to Active state, Because no feasible successor exists (30) G H (1) (10) A B C (10) D (100) E (100) F Network 7 7 7 Advert. Distance 21 220 40 Feasible Dist. 31 230 50 Neighbor B D H

  11. Multiple Protocol Support for Novell IPX Enhanced IGRP IPX RIP IPX RIP SAP Updates SAP Updates

  12. Multiple Protocol Support for AppleTalk Enhanced IGRP RTMP RTMP

  13. Multiple Protocol Support for IP Enhanced IGRP IPX RIP IPX RIP Autonomous System 200 Enhanced IGRP Autonomous System 200 IGRP

  14. Enhanced IGRP Configuration

  15. Enhanced IGRP for IP Configuration Router (config) # router eigrp autonomous-system-number • Defines Enhanced IGRP as an IP routing process Router (config-router) # network network-number • Selects participating attached networks

  16. Enhanced IGRP for IP Example 2.6.0.0 1.4.0.0 2.7.0.0 E 3.1.0.0 T0 S1 2.5.0.0 A S2 1.1.0.0 S0 2.2.0.0 2.1.0.0 B D 1.2.0.0 2.3.0.0 C router eigrp 109 network 1.0.0.0 network 2.0.0.0 B A 2.4.0.0

  17. Integrating Enhanced IGRP Enhanced IGRP IP RIP IP RIP AppleTalk RTMP AppleTalk RTMP IPX RIP IPX RIP • Enhanced IGRP saves WAN link by sending incremental routing updates

  18. Enhanced IGRP Path Selection • Enhanced IGRP uses a composite metric to pick the best path IP RIP IP RIP Enhanced IGRP 19.2 AppleTalk RTMP AppleTalk RTMP IPX RIP IPX RIP T1 T1 T1

  19. Integrated IPX Configuration Router (config) # ipx routing • Turns on IPX routing Router (config) # ipx router { eigrp autonomous-system-number | rip } • Selects a routing protocol for use by ipx

  20. Integrated IPX Example Enhanced IGRP IPX RIP Network 10 E0 S0 Network 20 ipx routing interface ethernet 0 ipx network 10 ! interface serial 0 ipx network 20 ! ipx router rip no network 20 ! Ipx router eigrp 1 network 20 • Only EIGRP is active on network 20

  21. IPX Incremental SAPs with Enhanced IGRP Enhanced IGRP IPX RIP E0 S0 Periodic SAP updates Incremental SAP updates • Non-Cisco systems are sensitive to incremental SAP updates • Multiaccess media interfaces default to periodic updates • Point-to-point interfaces default to incremental updates

  22. SAP Update Configuration Router (config-if) # ipx sap-incremental eigrp autonomous-system-number [ rsup-only ] • Forces a LAN interface to send incremental SAP updates • Used to override SAP update defaults • Assumes the presence of another Cisco router on that LAN

  23. IPX Incremental SAP Example Network 20 F0 Ipx routing ! ipx router eigrp 1 network 10 network 20 ! ipx router rip no network 10 no network 20 ! interface fddi 0 ipx network 10 ipx sap-incremental eigrp 1 ! Interface serial 0 ipx network 20 F0 S0 IPX RIP Network 10 F0 No IPX hosts on FDDI backbone • Enables incremental-only SAP updates on an Enhanced IGRP FDDI backbone to conserve bandwidth

  24. Integrated AppleTalk Configuration Router (config) # appletalk routing { eigrp router-number } • Turns on Enhanced IGRP for AppleTalk routing • - Router-number must be unique for each router in the AppleTalk internetwork Router (config-if) # appletalk protocol eigrp • Selects Enhanced IGRP as the protocol that generates routing updates on this interface • - Requires the AppleTalk cable range be specified first

  25. Integrated Apple Talk Example Enhanced IGRP AppleTalk S0 E0 Only RTMP is active, on by default appletalk routing eigrp 1 ! Interface ethernet 0 appletalk cable-range 10-10-10.51 appletalk zone Headquarters ! interface serial 0 appletalk cable-range 111-111 111.51 appletalk zone Shipping appletalk protocol eigrp no appletalk protocol rtmp RTMP is turned off, only EIGRP is active

  26. Redistribution with Enhanced IGRP Enhanced IGRP IP IP AppleTalk AppleTalk IPX IPX • Novell protocol redistribution with Enhanced IGRP is enabled by default • AppleTalk RTMP redistribution is enabled by default • Redistribution of IGRP in the same autonomous system is automatic • Other protocols require redistribution

  27. IP Route Redistribution AS 200 IGRP 172.16.0.0 • Routes are learned from another routing protocol AS Boundary Router AS 200 IGRP 172.16.0.0 S1 S0 AS 300 EIGRP 192.168.5.0 S1 advertises routes from EIGRP IP Routing Table I 192.168.5.0 I 172.16.1.0 I 172.16.2.0 I 172.16.3.0 IP Routing Table D EX 192.168.5.0 D 192.168.5.8 D 192.168.5.16 D 192.168.5.24 S0 advertises routes from EIGRP

  28. IP Route Redistribution Configuration Router (config-router) # redistribute protocol [option] • Allows routes discovered by one process to be advertised in the updates of another process Router (config-router) # default-metric bandwidth delay reliabulity loading mtu • Used for IGRP and Enhanced IGRP redistribution Router (config-router) # default-metric number • Used for OSPF, RIP, EGP BGP redistribution

  29. IGRP to Enhanced IGRP Migration Autonomous System 300 EIGRP Autonomous System 200 IGRP Autonomous System 100 IGRP/EIGRP Redistribution configuration required Automatic redistribution • Enhanced IGRP sends updates that are not compatible with IGRP full table updates • Redistribution is automatic within the same autonomous systems • Manual redistribution is required between autonomous systems

  30. IP Route Redistribution Example 1 AS 200 IGRP 172.16.0.0 AS 300 EIGRP 192.168.5.0 router eigrp 300 network 192.168.5.0 redistribute igrp 200 ! route igrp 200 network 172.16.0.0 redistribute eigrp 300 • default-metric command is optional with IGRP/EIGRP redistribution

  31. IP Route Redistribution Example 2 Autonomous System 300 EIGRP 201.222.5.0 RIP 172.68.0.0 router rip network 172.68.0.0 redistribute eigrp 300 default-metric 3 route eigrp 300 network 201.222.5.0 redistribute rip default-metric 56 2000 255 1 1500

  32. Minimizing Routing Updates

  33. Route Filtering Router (config-router) # distribute-list access-list-number { out | in } [ interface-name | routing-process ] • Specifies routes passed to the receiving routing protocol • Uses a standard access list to permit or deny routes • Can be applied to transmitted (outbound) or received (inbound) routing updates • Filters all updates or updates on specific interfaces

  34. IP Route Filtering Example • Hides network 10.0.0.0 using interface filtering 192.168.5.0 172.16.0.0 10.0.0.0 router eigrp 1 network 172.16.0.0 network 192.168.5.0 distribute-list 7 out s0 ! Access-list 7 permit 172.16.0.0 0.0.255.255

  35. IPX Route Filtering Example Network 9e Network 82 Network 6c ipx router eigrp 100 network 9e network 6c network 4a network 82 distribute-list 800 out s0 ! access-list 800 permit 6c access-list 800 deny -1 Network 4a • Only network 6c is advertised in routing updates

  36. Redistribution Filter Example router rip network 192.168.5.0 redistribute eigrp 1 deafult-metric 3 distribute-list out eigrp 7 ! router eigrp 1 network 172.16.0.0 redistribute rip default-metric 56 2000 255 1 1500 ! access-list 7 deny 10.0.0.0 0.255.255.255 access-list 7 permit 0.0.0.0 255.255.255.255 RIP 192.168.5.0 EIGRP 172.16.0.0 EIGRP 10.0.0.0 • Hides network 10.0.0.0 using redistribution filtering

  37. Enhanced IGRP Route Summarization • Network-level route summarization (Class A, B, or C) is enabled by default Router (config-router) # no auto-summary • Disables automatic summarization Router (config-if) # ip summary-address eigrp as-number addresss mask • Enables summarization for advertisements on a specific interface

  38. Route Summarization Example 192.168.4.2 172.16.1.0 S0 10.108.0.0 World 172.16.2.0 router eigrp 1 network 10.108.0.0 end int s 0 ip address 192.168.4.2 255.255.255.0 ip summary-address eigrp 1 172.16.0.0 255.255.0.0 router eigrp 1 network 10.108.0.0 network 172.16.0.0 no auto-summary

  39. Minimizing Routing Updates Router (config-router) # passive-interface interface-name • Prevent routing protocol updates from being generated on the interface • As an alternative to passive interface you: • Do not configure a routing protocol on the interface • Use access lists to filter routing protocol • Use route redistribution

  40. Using the passive-interface Command • The passive-interface command disables sending routing updates on interfaces router rip network 172.17.0.0 redistribute eigrp 90 default-metric 3 pasive-interface ethernet 0 ! router eigrp 90 network 172.16.0.0 redistribute rip default-metric 1544 100 255 1 1500 passive-interface serial 0 RIP 172.17.0.0 S0 E0 EIGRP 172.16.0.0 AS 90

  41. Static Route Configuration Router (config) # ip route network [ mask ] address [ distance ] • Defines a path to an IP destination network or subnet • Default administrative distance is 1 • Requires redistribution Router (config) # ip route network [ mask ] interface [ distance ] • Defines a path to an IP destination network or subnet • Default administrative distance is 0 (means directly connected) • Automatically redistributed

  42. Static Route Reditribution 192.31.7.10 192.31.7.18 201.222.5.0 B C 131.108.0.0 A S0 Passive-interface s0 E D ip route 131.108.0.0 255.255.0.0 192.31.7.18 ip route 201.222.5.0 255.255.255.0 192.31.7.10 ! router eigrp 1 network 192.31.7.0 default-metric 10000 100 255 1 1500 redistribute static distribute-list 3 out static ! access-list 3 permit 131.108.0.0 0.0.255.255

  43. VerifyingEnhanced IGRP Operation

  44. Verifying Enhanced IGRP Operation Router (config) # show ip protocols • Display the parameters and current state of the active routing protocol process Router (config) # show ip route eigrp • Display current Enhanced EIGRP entries in the routing table

  45. Verifying Enhanced IGRP Operation (cont.) Router (config) # show ip eigrp neighbors • Display the neighbours discovered by IP Enhanced IGRP Router (config) # show ip eigrp topology • Display the IP Enhanced IGRP topology table Router (config) # show ip eigrp traffic • Display the number of IP Enhanced IGRP packets sent and received

  46. Verifying Enhanced IGRP Operation (cont.) Router # show ipx route • Displays the contents of the IPX routing table Router # show ipx eigrp neighbors • Display the neighbors discovered by IPX Enhanced IGRP Router # show ipx eigrp topology • Displays the IPX Enhanced IGRP topology table

  47. Verifying Enhanced IGRP Operation (cont.) Router # show AppleTalk route • Displays the contents of the AppleTalk routing table Router # show AppleTalk eigrp neighbors • Display the neighbors discovered by AppleTalk Enhanced IGRP Router # show AppleTalk eigrp topology • Displays the AppleTalk Enhanced IGRP topology table

  48. Summary Enhanced IGRP is an advanced routing protocol that uses the DUAL algorithm Enhanced IGRP has the following features: Rapid convergence Incremental updates Routes IP, IPX, and AppleTalk Route summarization

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