In a Cisco 2610 router with three faEthernet interfaces (one for the LAN and two for internet access with two different providers), how could redundancy be enabled? I am aware HSRP can be used but it requires two or more routers, also VRRP can be used but this also requires two or more routers. How can redundancy be provided in this scenario? The idea is to have one faEthernet interface with one ISP and the other one with a different one, when one of them goes down, fault redundancy takes places transparently and automatically, when both faEth interfaces are up and running, all clients will be using both so service will be faster.
You can definetely have redundancy with that setup using BGP but you can't have load balancing between the links as BGP only supports one best path.
You need to establish 2 neighbor relations to two private AS ( one per ISP ) and ask them to inject a default route in to it ONLY. In that way BGP will do the redundancy part when one of the links is down.
The link below provide an example of what you are looking for
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...