Network Study Site

EIGRP Variance and Maximum Paths

2022 Aug 3

EIGRP Variance and Maximum Paths If two paths with unequal costs are learned through EIGRP to the same destination prefix, then EIGRP chooses the path with the best metric. In other words, EIGRP chooses the single best path, even though there may be an alternative path available that meets the feasibility condition. This behavior can be overruled ...

EIGRP Offset List

2022 Aug 2

EIGRP Offset List Offset Lists are used with distance vector routing protocols - such as EIGRP and RIP – to modify the metric of routes. An EIGRP Offset List allows the network administrator to increase the metric of incoming or outgoing EIGRP routes. An access-list can be configured and applied to ...

Gratuitous ARP

2022 July 30

EIGRP Summary Leak-Map Gratuitous ARP (GARP) is an unsolicited ARP reply message sent as a broadcast frame on a local subnet. GARP is an ARP reply message that is proactively initiated by a network device due to an FHRP state change or other reasons. A GARP message is not triggered and is not preceded by an ARP request message ...

EIGRP Summary Leak-Map

2022 July 29

EIGRP Summary Leak-Map If a component route of an EIGRP summary route needs to be advertised, a leak-map can be configured. This allows for the advertisement of an EIGRP summary route, together with one or more of its specific component routes. A leak-map is used for path manipulation ...

DMVPN with EIGRP, Dual Hub

2022 June 28

DMVPN with EIGRP, Dual Hub Outage of a hub router can disrupt a DMVPN network, but with redundant hub routers a DMVPN network is more resilient. Multiple designs can be configured with EIGRP to achieve hub router (NHS) redundancy, e.g. dual hub single cloud or dual hub dual cloud designs ...

EIGRP Stub Router

2022 July 27

EIGRP Stub Router Configuring an EIGRP stub router decreases the Query domain, reduces bandwidth usage, and can result in a more stable network. An EIGRP stub router signals to its EIGRP neighbors that the advertisement of EIGRP Query packets should be suppressed. This is especially useful for ...

EIGRP Route Filtering

2022 July 14

EIGRP Route Filtering Route filtering in EIGRP focuses on accepting or denying routes into the EIGRP topology table. EIGRP route filtering also deals with route tagging. This includes assigning tags to EIGRP routes and identifying routes based on their tags. Commonly, a prefix-list, route-tag list, or access-list specifies ...

EIGRP Summary Metric

2022 July 13

EIGRP Summary, and Summary Metric EIGRP route summarization saves system resources and reduces the routing table size. An EIGRP summary route inherits the best metric among its component routes. Any change within the component routes triggers a recalculation of the summary route metric ...

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