i have to know why most ISPs Run EIGRP;OSPF;BGP ON THEIR Network?i know BGP IS Important For external AS.WHY they not use only routing protocol either OSPF or EIGRP not both of Them WITH BGP for external AS...
BGP is exterior routing protocol which means it run between different autonomous systems. for e.g between customer and ISPs or between ISPs.
EIGRP, OSPF are interior gateway routing protocols which will run wihin a autonomous system (AS). So, you will always prefer to run a single interior routing protocol i.e EIGRP/OSPF/IGRP/RIP within you network.
If your network have multiple interior routing protocol, then you need to configure re-distribution between routing protocols.
In BGP, again there is iBGP (interior BGP) which will run within AS and eBGP (Exterior BGP) which will run between different AS.
Routing protocols like OSPF , Eigrp are designed as IGP to be run within an AS considering the convergence , number of routes that would be in the IGP to handle and route flapping . IGP's can handle route flapping within an AS and would be fine .
BGP is EGP designed to handle large number of routes and convergence is not a problem among multiple AS rather than considering Convergence within an AS .
Using BGP within an AS would be an added advantage to IGP .
EIGRP is a Cisco protocol that is only supported on Cisco routers. Most ISP's have multi-vendor networks and use OSPF or IS-IS because they are standards based protocols which can be used between differenet vendor's routers. BGP is used to talk between service provider and customer.
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
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Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...