Routing Protocols Administrative Distance

Protocol	Administrative Distance
Connected	0
Static	1
EIGRP summary	5
External BGP	20
Internal EIGRP	90
IGRP*	100
OSPF	110
IS-IS	115
RIP	120
EGP*	140
ODR	160
External EIGRP	170
Internal BGP	200
Infinite
* Deprecated

OSPF NETWORKs TYPES summary

OSPF NETWORK TYPE	Helo Addressing	Database Exchange Addresing	DR/BDR Election	Issues	Link Advertisement	Next Hop
Broadcast	Multicast 224.0.0.5	Multicast 224.0.05 224.0.0.6	Yes	Partial Mesh, NBMA Topology Hub and spoke Placement of DR (HUB) placement of BDR (none)	Link is advertised as prefix	Next hop is advertising router
Nonbroadcast	Unicast	Unicast	Yes	Partial Mesh, NBMA Hub and spoke Placement of DR (Hub) Placement of BDR Neighbor Statements	Link is advertised as prefix	Next Hop is advertising Router
Point to Point	Multicast 224.0.0.5	Multicast 224.0.0.5	No	Flood Administration overhead related to the subnetting	Link is advertised as prefix	Next hop is the other end of the point-to-point link
Point to mulipoint Broadcast	Multicast 224.0.0.5	Multicast 224.0.0.5	No	Flood Host entries /32 for the ends of the multipoint colection	Link is advertised as a number of host entries	Next hop is the other end of the point-to-point link
Point to Multipoint NonBroadcast	Unicast	Unicast	No	Flood Host entries /32 for the ends of the multipoint colection	Link is advertised as a number of host entries	Next hop is the other end of the point-to-point link