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21: EIGRP Routing
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n 19, you were introduced to the configuration of Routing Information Protocol (RIPv1 and v2), a distance vector routing protocol, and in 20, you learned about the configuration of Open Shortest Path First (OSPF), a link state protocol This chapter focuses on Cisco s proprietary routing protocol for TCP/IP: the Enhanced Interior Gateway Routing Protocol (EIGRP) EIGRP is a hybrid protocol; fundamentally, it is a distance vector protocol with many link state protocol advantages built into it This chapter covers only the basic operation and configuration of EIGRP A more thorough discussion is covered in Cisco s CCNP-level courses and exams
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EIGRP Overview
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EIGRP is a Cisco-proprietary routing protocol for TCP/IP It s actually based on Cisco s proprietary IGRP routing protocol, with many enhancements built into it Because it has its roots in IGRP, the configuration is similar to IGRP; however, it has many link state characteristics that were added to it to allow EIGRP to scale to enterprise network sizes These characteristics include the following:
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Fast convergence Loop-free topology Variable Length Subnet Masking (VLSM) and route summarization Multicast and incremental updates Multiple routed protocols
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The following sections cover some of the characteristics of EIGRP, its operation, and its configuration As of IOS release 123, Cisco no longer supports its older sibling, IGRP; EIGRP is still supported and widely deployed, however EIGRP has the following characteristics:
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Uses multicast addresses to disseminate routing information Offers load balancing across six paths to a destination (equal or unequal metrics) Supports an intelligent and complex metric structure
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EIGRP Overview
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Has fast convergence (triggered updates when changes occur and saves
neighbors routing tables locally)
Has little network overhead, since it uses incremental updates
Metrics and Interoperability
Like its older cousin IGRP, EIGRP uses the same metric structure, based on these components: bandwidth, delay, reliability, load, and maximum transmission unit (MTU) By default, only bandwidth and delay are used in the metric computation and the other values are turned off; however, you can manually enable these values in the metric algorithm One interesting point about the IGRP and EIGRP routing protocols is that if you have some routers in your network running IGRP and others running EIGRP, and both sets have the same autonomous system number configured, routing information will automatically be shared between the two This makes it easy to migrate from IGRP to EIGRP When sharing routes between the two routing protocols, the routers have to perform a conversion concerning the metrics Even though both protocols use the same metric components, they store them in different size values: EIGRP uses a 32-bit metric, while IGRP uses a 24-bit metric When integrating the two protocols together, EIGRP routes are divided by 256 to fit a 24-bit metric structure when passed to IGRP and IGRP routes are multiplied by 256 to fit a 32-bit metric structure when passed to EIGRP
The Cisco-proprietary EIGRP routing protocol uses bandwidth
and delay, by default, as metrics, but can also use reliability, load, and MTU size
Routing Tables and Updates
EIGRP uses the Diffusing Update Algorithm (DUAL) to update the local routing table This algorithm enables very fast convergence by storing a neighbor s routing information in a local topology table If a primary route in the routing table fails, DUAL can take a backup route from the topology table (a neighbor s routing table) and place this into the routing table without necessarily having to talk to other EIGRP neighboring routers to find an alternative path to the destination EIGRP supports both automatic and manual summarization Remember that EIGRP is, at heart, a distance vector protocol, and therefore it will automatically
21: EIGRP Routing
summarize routes across Class A, B, and C network boundaries, as was discussed in 8 You can also manually summarize within a class network, at your discretion Configuration of summarization is beyond the scope of this book, but it is covered in depth at Cisco s CCNP-level material One really unique feature of EIGRP is that it supports three routed protocols: IP (IPv4 and IPv6), Internetwork Packet Exchange (IPX), and AppleTalk In other words, EIGRP can route for all three of these protocols simultaneously If you are running these routed protocols in your environment, EIGRP is a perfect fit You need to run only one routing protocol for all three instead of a separate routing protocol for each, definitely reducing your routing overhead
EIGRP supports route summarization and routing for IPv4, IPv6,
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