Protocols with LFA support


[EIGRP](/eigrp) Loop-Free Alternate (LFA) Fast Reroute (FRR) is a feature that allows EIGRP to switch to a backup path in less than 50 ms. Fast reroute means we switch to another next hop, Loop-free alternate is an alternative path in the network that is loop-free.

There are two different methods to calculate LFAs:

[Difference between per-prefix LFA and per-link based LFA](/difference-between-per-prefix-lfa-and-per-link-based-lfa)

EIGRP supports LFA FRR since IOS 15.2(4)S or IOS XE 3.7S.

Here is an overview of other [routing](/routing) protocols that support LFA:

[Protocols with LFA support](/protocols-with-lfa-support)

Links:

https://networklessons.com/cisco/ccie-routing-switching-written/eigrp-loop-free-alternate-lfa-fast-reroute-frr/

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/command/ire-cr-book/ire-a1.html#wp2318306673



EIGRP LFA FRR

DMVPN redundancy options

DMVPN with more than two hubs

DMVPN

DNS - Authoritative Flag

DNS - Authoritative Server

DNS - Caching

DNS - Recursive Resolver

DNS - What is a delegation zone

DNS - stub zone

DNS - understanding zones

DNS cache windows PC

DSL - Asymmetric Digital Subscriber Line (ADSL)

DTP - Sending of Frames

DTP - best practice to disable

DTP - how to disable

Decrypt IPSec ESP traffic with Wireshark

Demarcation point

Difference between per-prefix LFA and per-link based LFA

Differences between CCIE and CCDE lab exams

Diffserv recommended configuration

Distribute-lists - using route maps to set attributes

Distribute-lists and named extended ACLs

EEM - action mail

EEM Cisco Embedded Event Manager

EEM Matching a string within CLI output

EEM sync and skip keywords

EIGRP - Advertised metric is cumulative

EIGRP - Advertising a route using the network command

EIGRP - Hello interval and Hold time

EIGRP - Hop Count

EIGRP - Network command syntax

EIGRP - Queries

EIGRP - Reliable Multicast

EIGRP - Source of values for metric calculation

EIGRP - Summarization per interface

EIGRP - Update message exchange process

EIGRP - af-interface configuration mode

EIGRP - how metrics are sent in updates

EIGRP - metric computation method

EIGRP - metric equation

EIGRP - network command with no wildcard mask

EIGRP - stub site function

EIGRP Create and advertise a default route

EIGRP Feasibility condition

EIGRP Header

EIGRP IP bandwidth-percent example

EIGRP Refining the behavior of load balancing with traffic-share

EIGRP SIA timers

EIGRP authentication

EIGRP auto-summary

EIGRP change rib scale

EIGRP establishing remote neighbors

EIGRP header - ACK field

EIGRP named mode

EIGRP on the Nexus Platform

EIGRP redistributing named mode

EIGRP rib-scale

EIGRP seed metrics when redistributing

EIGRP split horizon verification

EIGRP split-horizon vs poison reverse

EIGRP unequal cost load balancing

EIGRP what happens when a feasible successor fails

EIGRP

EPC - Cisco Embedded Packet Capture

ERSPAN

EVE-NG supported Cisco and other vendor images

Equal-cost Multi-path routing

EtherChannel - applying configurations to the interface

EtherChannel - implementing over 802.1Q tunneling

EtherChannel - load balancing algorithms

EtherChannel - max-bundle

EtherChannel - prerequisites for bundling

EtherChannel

Etherchannel - fast-switchover

Ethernet - role of FCS field

Ethernet - speed and duplex mismatches

Ethernet - speed and duplex settings on an ISR4431

Ethernet CSMA-CD

Ethernet VPN (EVPN)

Ethernet administrative and operational encapsulation

Ethernet administrative operational mode

Ethernet frame types

Ethernet header

Ethernet over IP (EoIP)

Ethernet

FHRP - interaction with routing protocols

FHRP - which ports should you configure

FHRP Communication Between Redundant Routers

FHRP Load Balancing Behavior

FHRP Protocols

FHRP communication path of keepalives

Fiber optic types

Fiber optics - Multi mode fiber optics characteristics

Fiber optics - Single mode fiber optics characteristics

Fiber optics - color coding

EIGRP LFA FRR

Links to this page: