Cisco ASR 9000 Series Configuration Manual page 284

Configuring Route Summarization for an EIGRP Process
Before You Begin
Note 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.
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
Command or Action
Step 1 configure
Step 2 router eigrp as-number
Example:
RP/0/RSP0/CPU0:router(config)# router eigrp 100
Step 3 address-family { ipv4 }
Example:
RP/0/RSP0/CPU0:router(config-eigrp)# address-family
ipv4
Step 4 route-policy name out
Example:
RP/0/RSP0/CPU0:router(config-eigrp-af)# route-policy
FILTER_DEFAULT out
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
256
Purpose
Specifies the AS number of the routing process to
configure an EIGRP routing process
Enters an address family configuration mode.
Applies a routing policy to updates advertised to or
received from an EIGRP neighbor.
Implementing EIGRP
OL-30423-03