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BGP Communities The community attribute is a transitive optional attribute. Communities can be used to mark a set of prefixes that share a common property. Any BGP router can tag routes in incoming and outgoing routing updates or when doing redistribution.By default, communities are stripped in outgoing BGP updates. BGP community types:- Well known (pre-defined Own communities Well-known communities (predefined) Internet: advertise this route to the Internet community, any route belonging to this community No-export: do not advertise to EBGP peers; keep this route an AS only. No-advertise: do not advertise this route to any peer, internal or external. Local-AS: used in confederation scenarios, to prevent the transmission of packets outside the local sub-AS.    Local-AS is a well-known BGP community and it's used in confederation scenarios to prevent the transmission of traffic outside the local-as.  In this lab we are going to configure two BGP communities No-advertise an...

  Border Gateway Protocol (BGP) advertises, learns, and chooses the best paths inside the wide internet. When two ISPs connect, they typically use BGP to exchange routing information. The ISPs of the worldwide exchange routing information with one or more than one ISPs. In this blog, we will configure the weight of BGP attributes, local preference, and MED. BGP Peer group let's take a look at BGP attributes.  An autonomous system is a collection of networks under a single technical administration domain. IGPs like OSPF EIGRP operate within an Autonomous system. We use BGP between the autonomous systems to exchange loop-free routing information read more...   Peer group  By default, BGP updates are sent on a neighbor-to-neighbor basis and the result is more CPU resources being used, also by implementing non-default settings for example performing filtering using prefix lists, route maps, or filter lists to those neighbors, even more, CPU resources are consume...

  Open Shortest Path First (OSPF)  Open shortest path first is an open standard routing protocol implemented by a wide variety of network vendors, including Cisco. And it’s that open standard characteristic that’s the key to OSPF flexibility and popularity. OSPF uses the Dijkstra algorithm to initially construct a shortest path tree and follows that by populating the routing table with the resulting best route. Its quick convergence is another reason it’s a favorite. Another two great advantages OSPF offers are that it supports multiple, equal-cost routes to the same destination and it also supports both IPv4 and IPv6 routed protocols read more... OSPF STUBS OSPF stubs allow the OSPF routers in an area to use default routes for forwarding packets to Area Border Routers (ABRs), rather than more specific routes. OSPF stubs reduce memory consumption and CPU processing time on the routers inside the area because the routers in that area can have fewer LSAs in their LSDBs Read more...