BGP Weight is the first BGP attribute if we dive deep into BGP’s algorithm of best path selection followed by Local_Preference & aggregate (detailed in my first post in BGP section). Weight is vendor specific (Cisco proprietary) so it is found only on Cisco routers. Weight is always local on a router and it is not exchanged between BGP routers. The path with the highest weight is always preferred. The range of Weight is 0-65535 and it defaults to 0 always. i.e. The default weight for learned routes is 0 and the default weight for a locally originated route is 32768. We Read More …
Category: distance vector routing protocols
Wireshark Operators
Wireshark is the most useful & popular tool for packet Level deep Network Analysis & Troubleshooting. Most importantly, it is open source. It is like a measuring meter or device to find and examine what is going on inside a network cable or port just like a multimeter is used by an electrician to examine what is going on inside an electric cable … but of course at much deeper level. Wireshark or such SW tools are not something very new. Such tools were available in the past as well but they were very expensive and proprietary because they were mostly Read More …
MP-BGP and Address Families
BGP originally only supports normal IPv4 unicast prefixes. With the passage of time & advancement in Network Technology, the need for support of more prefix types arose. There were two solutions to this problem: First, to invent a whole new protocol or a new version of BGP, Second, to add the extra functionality in the existing BGP. Of course, we chose the second one due to its flexibility & backward compatibility. Hence, MP-BGP came into existence under RFC4760 (https://tools.ietf.org/html/rfc4760) in 2007. MP-BGP supported more than 15 different BGP address families and it solved the problem. Nowadays MP-BGP (Multiprotocol BGP) is a Read More …