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- Basic of BGP routing Protocol – A Two Napkin Protocol – Part 1
A 30-year-old protocol that still has its value: - BGP protocol It is also called the Two Napkin Protocol (Not an official name) If I look at a bit of the history of this protocol then in 1989 when Kirk Lougheed, Len Bosack, and Yakov Rekhter were sharing a meal at an IETF conference They famously sketched the outline of their new routing protocol on the back of some napkins, hence often
- BGP Zero to Hero Part 8, BGP filtering methods - Cisco Learning Network
The BGP Prefix-Based Outbound Route Filtering feature uses Border Gateway Protocol (BGP) outbound route filter (ORF) send and receive capabilities to minimize the number of BGP updates that are sent between BGP peers
- BGP - Understanding Inbound Traffic Engineering
Understanding of the BGP Best-Path selection process In order to show the various options that you have to try an manipulate how traffic enters your network I will be using the following topology
- Introduction to VXLAN and EVPN - Cisco Learning Network
Ability to discover VTEPs through BGP messaging rather than based on receiving VXLAN-encapsulated frames This is more secure than blindly accepting all VXLAN-encapsulated frames
- BGP Zero to Hero Part 7, BGP Communities - Cisco Learning Network
The BGP community is the tagging mechanism we use to mark our BGP prefixes The BGP community is an Optional, Transitive BGP attribute, meaning that if they exist they should be propagated to all BGP neighbors (The word “Optional” here means it’s optional to use, but once you used it should be propagated to all BGP neighbors)
- BGP Zero to Hero Part 9, AS-Path Attribute Manipulation
BGP uses the AS_PATH attribute for loop detection and avoidance The AS_PATH attribute is a list of AS numbers that the update has traversed BGP router adds it’s own AS number to the AS_PATH sequence (attribute) when it advertise the update to a neighbor in another AS
- Origin codes: i - IGP, e - EGP, ? - incomplete
My doubt is, the route 172 16 1 0 24 is advertised by an e-BGP router, then why there is an i-IGP route showing in bgp routing table What cases brings me the origin paths as e-BGP and ? - incomplete
- BGP lt;-- gt; OSPF route redistribution - Cisco Learning Network
I think BGP on RTR-1 is seeing a better route in the routing table because of OSPF (Higher Weight) and never adds the OSPF routes to its BGP table I was expecting eBGP to come in and supersede the OSPF route
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