PurposeCommand or Action
commit
Step 10
Configuring Route Summarization for an EIGRP Process
This task configures route summarization for an EIGRP process.
You can configure a summary aggregate address for a specified interface. If any more specific routes are in
the routing table, EIGRP advertises the summary address from the interface with a metric equal to the minimum
of all more specific routes.
Before you begin
You should not use the summary-address summarization command to generate the default route (0.0.0.0)
from an interface. This command creates an EIGRP summary default route to the null 0 interface with an
administrative distance of 5. The low administrative distance of this default route can cause this route to
displace default routes learned from other neighbors from the routing table. If the default route learned from
the neighbors is displaced by the summary default route or the summary route is the only default route present,
all traffic destined for the default route does not leave the router; instead, this traffic is sent to the null 0
interface, where it is dropped.
The recommended way to send only the default route from a given interface is to use a route-policy command.
Note
SUMMARY STEPS
1. configure
2. router eigrp as-number
3. address-family { ipv4 }
4. route-policy name out
5. interface type interface-path-id
6. summary-address ip-address { / length | mask } [ admin-distance ]
7. commit
DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Specifies the AS number of the routing process to configure
an EIGRP routing process
router eigrp as-number
Example:
Step 2
RP/0/RP0/CPU0:router(config)# router eigrp 100
Enters an address family configuration mode.address-family { ipv4 }
Example:
Step 3
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
191
Implementing EIGRP
Configuring Route Summarization for an EIGRP Process
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