Tag Archives: summarization

Route redistribution and summarization

Order of metric operations:

  1. Call a route map from the redistribute command, with the route map using the set
    metric command. This method allows different metrics for different routes.
  2. Use the metric option on the redistribute command. This sets the same metric for
    all routes redistributed by that redistribute command.
  3. Use the default-metric command under the router command. This command sets the
    metric for all redistributed routes whose metric was not set by either of the other
    two methods.
IGP Default Metric Default (and Possible) Metric Types
EIGRP External
OSPF 20/1 E2 (E1 or E2)
IS-IS 0 L1 (L1, L2, L1/L2, or external)


distance { distance-value neigh-ip-address { wildcard-mask } [ ip-standard-list ]
[ ip-extended-list ]
distance distance
distance eigrp internal-distance external-distance
distance ospf {[ intra-area dist1 ] [ inter-area dist2 ] [ external dist3 ]}
distance bgp external internal local

Default routing

redistribute static Yes Yes No
default-information originate Yes No Yes
ip default-network Yes Yes No
Summary routes No Yes No

If a static route to is in the local routing table, the default-information originate command does NOT cause RIP to inject a default. Redistribute static should be used in that case.

Cisco documentation advises against using route summarization to create a default route.