Differences

This shows you the differences between two versions of the page.

--- network_stuff:cisco:bgp_notes [2017/02/24 08:38] – jotasandoku
+++ network_stuff:cisco:bgp_notes [2023/11/02 14:38] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-**OUTPUT OF BGP TABLE**:\\
+**OUTPUT OF BGP TABLE** (triplet and parenthesis meaning):\\
 **show ip bgp <prefix>**\\
 x.x.x.x from y.y.y.y (RID) \\
@@ Line 11: / Line 11: @@
 **ASN PREPENDING**
   ip as-path access-list 1 permit ^$    # this indicates my own local routes
-route-map BGP100_SANTANDER_TO_BGP200_FR01_DMZR01_GRE permit 10
+  route-map BGP100_SANTANDER_TO_BGP200_FR01_DMZR01_GRE permit 10
- match ip address prefix-list BGP100_SANTANDER_GRE_TO_ALL_SITES
+   match ip address prefix-list BGP100_SANTANDER_GRE_TO_ALL_SITES
- set as-path prepend 65103 65103 65103 65103 65103 #
+   set as-path prepend 65103 65103 65103 65103 65103 #
+----
+**PATH HUNTING**
+  * Undesired phenomeda. Happens because BGP is, by definition, unaware of the topology
+  * During convergence, BGP will ''hunt'' for another path andn happily advertises these paths to peers even though the path is through the peer itself. [[https://lostintransit.se/2023/10/09/path-hunting-in-bgp/|External Link]]

dokucama