What is Auto-Summary EIGRP?
What is Auto-Summary EIGRP?
Auto summarization is a feature which allows Enhanced Interior Gateway Routing Protocol (EIGRP) to summarize its routes to their classful networks automatically.
What is the auto-summary command?
To restore the default behavior of automatic summarization of subnet routes into network-level routes, use the auto-summary router configuration command. To disable this feature and transmit subprefix routing information across classful network boundaries, use the no form of this command.
What is EIGRP summary address?
Description. This command lets you specify a summary address for routes advertised through a specific interface by EIGRP. This command must be applied only to interfaces. It is beneficial if auto-summary has been disabled for EIGRP, as this allows you to define a specific summary address.
Why is there no auto summary in OSPF?
Route summarization helps reduce OSPF traffic and route computation. OSPF, unlike EIGRP, doesn’t support automatic summarization. Also, unlike EIGRP, where you can summarize routes on every router in an EIGRP network, OSFP can summarize routes only on ABRs and ASBRs.
What is summarizing and examples?
Summarizing is defined as taking a lot of information and creating a condensed version that covers the main points. An example of summarizing is writing a three or four-sentence description that touches upon the main points of a long book.
What is the auto summary feature in EIGRP?
In EIGRP, the auto-summary feature is enabled by default. This means that EIGRP will automatically summarize networks at their classful boundaries.
How do I summarize routes in EIGRP?
Two methods for summarizing routes exist: automatic summarization and manual summarization. By default, EIGRP has the auto summary feature enabled. Because of this, routes are summarized to classful address at network boundaries in the routing updates.
What is the relationship between R1 and R2 in EIGRP?
Both routers are running EIGRP and have established the neighbor relationship. The router R1 has a directly connected subnet 10.5.10.0/24 that it advertises to R2. Because the auto-summary feature is turned on, R1 will summarize the subnet 10.5.10.0/24 and send the classful route 10.0.0.0/8 to R2.
Does EIGRP automatically summarize networks at classful boundaries?
This means that EIGRP will automatically summarize networks at their classful boundaries. The auto-summary feature can be useful, but it can also cause problems with discontiguous networks (which are two or more subnetworks of a classful network connected together by different classful networks).
