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Unicast Routing Protocols Comparison RIP Type Distance Vector Algorithm Bellman-Ford Admin Distance 120 Standard RFCs 2080, 2453 Supported Protocols IPv4, IPv6 Transport UDP/520 Authentication Plain, MD5 Multicast Address 224.0.0.9 EIGRP Distance Vector DUAL 90/170 (external)/5 (summary) Cisco proprietary IPv4, IPv6, IPX, Appletalk IP/88 MD5 224.0.0.10 Terminology Split-HorizonMitigates routing loops by ensuring a route is never advertised back to the neighbor from which it was learned Poison Reverse Learned routes are advertised back to their originator as explicitly invalid Troubleshooting show ip[v6] rip database debug ip rip { database | events } debug ipv6 rip [interface] Global Configuration show ip[v6] protocols OSPF Link State Dijkstra 110 RFCs 2328, 5340 IPv4,IPv6 IP/89 Plain, MD5, AH (v3) 224.0.0.5-6 IS-IS Link State Dijkstra 115 ISO 10589, RFC 1142 IPv4, IPv6, CLNP Layer 2 Plain, MD5 N/A RIP Configuration ! Enable RIPv2 IPv4 routing router rip version 2 ! Disable RIPv2 automatic summarization no auto-summary ! Designate RIPv2 interfaces by network network IPv4-network ! Identify unicast-only neighbors neighbor IP-address ! Originate a default routedefault-information originate ! Designate passive interfaces passive-interface {interface | default} ! Modify equal-cost load balancing maximum-paths 1-16 ! Modify timers timers basic update invalid hold flush ! Enable RIPng IPv6 routing ipv6 router rip name ! Toggle split-horizon and poison-reverse [no] split-horizon [no] poison-reverse BGP Path Vector Path Selection 20/200 (IBGP) RFC 4271 IPv4,IPv6 TCP/179 MD5 N/A

OSPF
OSPFv2 Link State Advertisements Router Link (Type 1) Lists neighboring routers and the cost to each; flooded within an area Network Link (Type 2) Generated by a DR; lists all routers on an adjacent segment; flooded within an area Network Summary (Type 3) Generated by an ABR; advertises routes between areas ASBR Summary (Type 4) Injected by an ABR into the backboneto advertise the presence of an ASBR in a nonbackbone area External Link (Type 5) Generated by an ASBR and flooded throughout the AS to advertise a route external to OSPF Group Membership (Type 6) Used by Multicast OSPF; unsupported by IOS NSSA External Link (Type 7) Generated by an ASBR in a not-so-stubby area; converted into a type 5 LSA by the ABR when leaving the area OSPFv3 Link StateAdvertisements Name 0x2001 Router LSA 0x2002 Network LSA 0x2003 Inter-area prefix LSA 0x2004 Inter-area router LSA 0x4005 AS-external LSA 0x2006 Group membership LSA 0x2007 Type-7 LSA 0x0008 Link LSA 0x2009 Intra-area prefix LSA v2 Equiv. Type 1 Type 2 Type 3 Type 4 Type 5 Type 6 Type 7 N/A N/A

Router Roles Internal Router All interfaces reside within the same area Backbone Router A router with atleast one interface in area 0 Area Border Router (ABR) Connects two or more areas AS Boundary Router (ASBR) Connects to additional routing domains (redistribution to or from other protocols) Area Types Standard Area Default OSPF area type Stub Area External link (type 5) LSAs are replaced with a single default route Totally Stubby Area Type 3, 4, and 5 LSAs are replaced with a default routeNot-So-Stubby Area (NSSA) A stub area containing an ASBR; type 5 LSAs are converted to type 7 within the area External Route Types E1 Considers the cost to the advertising ASBR plus the external cost of the route E2 (Default) The external cost of a route as seen by the ASBR; internal OSPF cost is not considered Troubleshooting show ip[v6] ospf [process] interface show ip[v6] ospf [process] neighborshow ip[v6] ospf border-routers show ip[v6] ospf database [LSA-type] show ip[v6] ospf virtual-links debug ip[v6] ospf […] Network Types

Metric Formula
reference-bandwidth cost = link speed

OSPF Configuration ! Create an OSPF process [ipv6] router ospf process-ID ! Specify a router ID formatted as IPv4 dotted-decimal router-id router-ID ! Modify the default reference bandwidth auto-cost...