For instance, with the earlier example, 172.16.0.0/16 includes all the addresses in the original three subnets, but the summary route includes many other addresses as well.įor example, consider the best summary route for those earlier three subnets: 172.16.1.0/24, 172.16.2.0/24, and 172.16.3.0/24. However, for CCNA, best summary generally means the summary route that includes all the addresses in the original subnets, but is the smallest such subnet. To determine the best summary route – in other words, the best subnet/mask combo to advertise as a summary – you need to think about the goals of a given network. Many possible summary routes exist for a given set of routes. For instance, if a router had routes for subnets 172.16.1.0/24, 172.16.2.0/24, and 172.16.3.0/24, you could advertise a summary route for subnet 172.16.0.0/16, because it represents a superset of original three subnets, in that it includes all the addresses in the original three subnets, plus some others.
EIGRP SUMMARY ROUTE CALCULATOR MANUAL
The term manual summary route refers to the fact that the summary route requires a configuration command that the engineer must type on some router.įor the CCNA exam, you need to be ready to look at a set of routes in a router’s routing table, and find a larger subnet/mask combination that could be configured as a summary route. That summary route represents a superset of the range of addresses compared to the original routes. Instead of advertising those multiple routes for smaller subnets, the router instead advertises that one summary route. The range of addresses that match that single route includes the same addresses in multiple other subnets in a router’s routing table.
Ask questions if you have them!Ī summary route, sometimes called a manual summary route, is a route advertisement that lists a single route. Other later posts then give you some practice problems. What does that mean, and how do you do it? Today’s post hits the highlights at least, and points to more info.
EIGRP SUMMARY ROUTE CALCULATOR HOW TO
Today’s post sets up the topic of how to find a “best” summary route. 200-301 V2 Ch16: Controller-Based Networks.200-301 V2 Part 4: Network Architectures.200-301 V2 Ch12: Miscellaneous IP Services.200-301 V2 Ch05: Securing Network Devices.200-301 V2 Ch04: Security Architectures.200-301 V1 Ch25: Configure IPv6 Routing.200-301 V1 Ch24: Configure IPv6 Addressing.200-301 V1 Ch18: Troubleshooting Routing.200-301 V1 Ch16: Router Addresses and Routes.200-301 V1 Ch14: Analyzing IPv4 Subnets.200-301 V1 Ch12: Classful IPv4 Networks.
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