OSPF Feature Summary & EIGRP

Transport
IP, protocol type 89(Does not use UDP or TCP. EIGRP uses Type 88.

Metric
Based on cumulative cost of all outing interfaces in a route. The interface cost defaults to a function of interface bandwidth but can be set explicitly. (IP OSPF Bandwidth value). EIGRP uses, Load, Reliability, bandwidth and delay. (BW and DW are default).

Hello Interval
interval at which a router send OSPF Hello messages on an interface.

Dead Interval
Timer used to determine when a neighboring router has failed, based on a router not receiving any OSPF messages, including Hellos in this timer period.

Update destination address
Normally sent to 224.0.0.5(All SPF routers( and 224.0.0.6(All Designated routers)

Full or Partial Updates
Full updates are used when new neighbors are discovered, otherwise partial updates are used.

Authentication:
supports MD5 and clear-test authentication.(IPV4)

VLSM/ClasslessOSPF includes the mask with each route, also allowing it to support discontiguous networks and VLSM.

Route Tags
allows OSPF to tag routes as they are redistributed into OSPF

next-hop field
supports the advertisement of routes with a different next-hop router than the advertising router.

manual route summarization
Allows route summarization at ABR routers only. Eigrp you can summarize on any device per interface.