BGP Attributes and Routing Decision Principles
BGP Attributes - Fundamental Properties
1. Preference Value (PrefVal)
This is a proprietary attribute (Huawei implementation) -- effective only locally (since it's not propagated, modifications can only be made at the entry point)
[r3]bgp 2
[r3-bgp]peer 4.4.4.4 preference-value 1
All BGP routes learned from neighbor 4.4.4.4 will have their p ...
Posted on Tue, 22 Sep 2026 16:30:31 +0000 by Frozenlight777
BGP Protocol Fundamentals: Architecture, States, and Path Selection
Routes are generally categorized into two types:
Directly Connected Routes: These routes have a default preference value of 0, representing the highest priority.
Non-Directly Connected Routes: These are further divided into static routes (default preference 60) and dynamic routes. Dynamic routing protocols fall into two categories:
IGP (Interi ...
Posted on Sat, 27 Jun 2026 17:16:57 +0000 by myshoala
BGP Extended Knowledge Summary
1. BGP Route Advertisement Considerations
In BGP, there are two primary methods for route advertisement:
Advertise directly connected routes on each BGP-speaking device
Advertise routes learned through IGP from non-BGP devices within the AS (most common scenario)
When BGP advertises routes from the local routing table, it carries the local IG ...
Posted on Sat, 23 May 2026 19:29:21 +0000 by jahstarr