Routing:
[Gen][CCNA][CCNP Route][CCNP Remote][CCDA][MPLS][EEM][Add][Juniper][ACL][Host]
Switching: [CCNP Switch] [Switch Add] [Intro] [VLANs] [MLS] [STP] [QoS] [Availability] Security: [CCNP Security] [CCNA Security] [CCNP ISCW][PIX] [Adv PIX/ASA] [Net Sec1] [Net Sec2] Wireless: [Wireless] [Wireless Chall] [CCNA Wireless] [Wireless Theory] Voice: [Voice/QoS] [CCNA Voice] [CCVP Gateway] [CCVP Voice] Topics: [Dot1q][Dot1x][BGP][BRI][DHCP][IGRP][IGMP][OSPF][PPP][QoS][RADIUS][RIP][Subnet][SNMP][VLAN] IGRP (Interior Gateway Routing Protocol)IGRP (Interior Gateway Routing Protocol) is a distance-vector routing protocol (as RIP), which is used as an interior routing within an AS. Like RIP, it transmits routing information at regular intervals, but unlike RIP, it uses a much better measure of the metric, these include: Bandwidth; Delay; Load; Reliability; and Maximum transmission unit (MTU). CCNA Challenges
CCNP Route
CCNP SwitchPIX/ASA
CCNP ISCWSecurity
CCVP |
Outline
IGRP (Interior Gateway Routing Protocol) is a distance-vector routing protocol (as RIP), which is used as an interior routing within an AS. Like RIP, it transmits routing infor-mation at regular intervals, but unlike RIP, it uses a much better measure of the metric, these include:
- Bandwidth.
- Delay.
- Load.
- Reliability.
- Maximum transmission unit (MTU), which defines the maximum data packet size that an interface can handle.
It advertises routing information every 90 seconds. The key points of IGRP are:
- Handles complex networks, as the metric can define problems (rather than the basic hop count used in RIP).
- It allows for more efficient routing, as the network can cope with different delays and bandwidths.
- Scaleable for very large networks.
Configuration
A sample configuration is:
> en # config t (config)# router igrp 128 (config-router)# network 149.91.240.0 (config-router)# network 45.0.0.0 (config-router)# network 157.43.72.0 (config-router)# variance 65 (config-router)# timers basic 9 11 1 21 (config-router)# exit (config)# ip default-network 101.220.22.0
For the metrics for the timers, we have Basic (time between updates), Invalid, Holddown and Flush:
(config-router)# variance ? 1-128 Metric variance multiplier (config-router)# variance 65 (config-router)# timers ? basic Basic routing protocol update timers (config-router)# timers basic ? 0-4294967295 Interval between updates (config-router)# timers basic 9 ? 1-4294967295 Invalid (config-router)# timers basic 9 11 ? 0-4294967295 Holddown (config-router)# timers basic 9 11 1 ? 1-4294967295 Flush