command that can display routes containing AS loops

Song Li refresh.lsong at
Mon Jan 12 13:05:38 UTC 2015

Hi everyone,

I am curious about the AS loops in the AS-path. I think there should be 
a very, very few received BGP routes that contain the local AS#. But 
because such routes will be dropped and not installed in Loc-RIB, I want 
to know if there is a command that can display the dropped routes 
containing AS loops (in cisco or juniper router). Does anybody know?



Song Li
Room 4-204, FIT Building,
Network Security,
Department of Electronic Engineering,
Tsinghua University, Beijing 100084, China
Tel:( +86) 010-62446440
E-mail: refresh.lsong at

More information about the NANOG mailing list