Start networking and exchanging professional insights

Register now or log in to join your professional community.

Follow

Why ibgp does not propagate route leaned from one ibgp neighbor to another ibgp neighbor in same autonomous system?

user-image
Question added by Muhammad Irfan Basharat , Manager network trainings , Virtual Packet
Date Posted: 2015/02/05

  • Check the synchronization because the default behaviour is off.
  • should be full mesh

Ajaypal singh
by Ajaypal singh , Senior Network and Security Engineer , Network Bulls Technologies

its a bgp loop avoidance mechanism within the single Autonomous system because in ebgp as-path sequence is used as loop avoiding method but within a single AS as-path is not updated as routes are propagated within the AS. So to control the loop in ibgp no ibgp neighbor gives ibgp route to its ibgp peer. Route-reflectors or ibgp fullmesh are the methods for route propagation within the single bgp AS 

Anant Vaibhav
by Anant Vaibhav , Senior Administrator , WIPRO Technologies Ltd

Because of a rule in Ibgp called as Split horizon so to avoid loops in the AS.So to make communication either you make a full mesh using neighbor commands or you can use route reflectors.

mohammed lasheen
by mohammed lasheen , Senior Voice Core Engineer , Telecom Egypt

to avoid loops in autonomous system

.

Rajeev  Rai  CCIE RS SP DC
by Rajeev Rai CCIE RS SP DC , Technical consultant , Data center Shifting

In Order to avoid loop in BGP.            

Tauheed  Anwer
by Tauheed Anwer , Network Engineer , Digital World Pakistan (DWP) Group, Islamabad

In order to avoid loops.                                                                             When  a route learned from the same autonomous system, remote router in the ibgp thinks that it is its own route so the route did not propagate.

Tasleem Rumani
by Tasleem Rumani , Network Security Engineer , Emirates Integrated Telecommunication Company-du

In order to avoid Loops.

Abdullah Alammar
by Abdullah Alammar , system admin , شركة العثيم المتحدة

This is because of the Split Horizon in BGP which used to prevent loops

Abuzar Ghafari
by Abuzar Ghafari , Consulting Engineer -TDA , Cisco Systems

You should check the TTL Security hops and the interface that is propagating/advertising is mentioned or not. for far end and local end. 

Mostafa Khamies Dakam
by Mostafa Khamies Dakam , Network Specialist , Libyan Fertilizer Company

ibgp will not propagate those routs, until he learn them from internal protocol, like OSPF or Rip

More Questions Like This