EIGRP summarization Summarization can be employed on any router in an EIGRP network, since it is a distance-vector protocol and does not keep a LSDB on all routers on the network. Summary routes in EIGRP have an AD value of 5. The summary router will advertise the summary route with an outgoing interface of Null0… read more »
1.3.c i General operations Here’s a quick overview of EIGRP: Distance-vector routing protocol. Transport is IP protocol 88 (does not use TCP or UDP). Also implements it’s own Reliable Transport Protocol (RTP). Hello Timer – Interval at which Hello messages are sent out an interface. Hold Timer – Used to determine when a neighbor has… read more »
EIGRP’s operations can be conceptually simplified into three basic steps: Step 1. Neighbor Discovery: Through the exchange of Hello messages, EIGRP-speaking routers discover one another, compare parameters (for example, autonomous system numbers, K-values, and network addresses), and determine if they should form a neighborship. Step 2. Topology Exchange: If neighboring EIGRP routers decide to form… read more »
OSPF Basic OSPF supports adjacency authentication to protect control plane E.g. prevent against routing injection attack Every OSPF packet header includes authentication information I.e. Hello, LSU, LSR, etc. Authentication does not mean encryption OSPFv2 payload is still clear text OSPFv3 supports IPsec encryption Types of authentication (3) Type 0 – Null Type 1 – Simple… read more »
1.3d i Equal-cost EIGRP will load balance 4 equal cost paths into the routing table by default. Traffic is shared equally between each path. The number of paths is configurable using the command: max-paths <[1-6]>. Configuration Verification 1.3d ii Unequal-cost EIGRP allows for unequal cost load balancing using the variance command where variance is a… read more »
1.3b i RD, FD, FC, successor, feasible successor RD Reported Distance, the total metric along a path to a destination network as advertised by an upstream router. FD Feasible Distance, the best metric along a path to a destination, includes metric to the neighbour advertising the path. Lowest calculated metric to each destination. FC Feasibility… read more »
EIGRP can be configured in Named mode which simplifies the configuration of EIGRP under one area of config, instead of spread between the router section and all the interfaces.