Hi,
When you talk about BGP's origin it means, from where the route was taken
and placed into the BGP table,
if the paths are originated via IGP,EGP or incomplete.
When a route is injected into BGP Via redistribution, statically or
dynamically, the origin of the route will be incomplete because when you
redistribute you loose all the information of the update and it is being
marked as a question mark.
* 212.117.151.173 0 9116 5585 8584
i
*> 212.150.206.0/23 212.150.56.5 179207680 0 8584 i
*> 212.150.221.0 212.150.56.5 0 0 8584 i
*> 212.150.228.0/22 212.150.56.5 179207680 0 8584 i
* 212.117.151.173 0 9116 5585 8584
i
*> 212.179.0.0/17 212.117.151.173 0 9116 5585 8551
i
*> 212.179.128.0/19 212.117.151.173 0 9116 5585 8551
i
*> 212.179.160.0/19 212.117.151.173 0 9116 5585 8551
i
*> 212.179.192.0/19 212.117.151.173 0 9116 5585 8551
i
*> 212.179.224.0/19 212.117.151.173 0 9116 5585 8551
i
*> 213.8.0.0/16 212.117.151.173 0 9116 5585 5486
i
*> 213.8.108.0/22 212.117.151.173 0 9116 5585 5486
i
*> 213.8.202.0/23 212.117.151.173 0 9116 5585 5486
?
*> 213.8.208.0/21 212.117.151.173 0 9116 5585 5486
?
*> 213.57.0.0/16 212.117.151.173 0 9116 5585 8584
12849 i
*> 216.72.32.0/21 212.150.56.5 592384 0 8584 i
* 212.117.151.173 0 9116 5585 8584
i
*> 216.72.40.0/22 212.150.56.5 592384 0 8584 i
* 212.117.151.173 0 9116 5585 8584
i
The origin attribute is one of the most powerful decision making attributes,
he is the second most powerful one.
There is the capability of controlling the origin with a set origin command
through a route map as followed:
access-list 101 deny ip 192.168.0.0 0.0.255.255 any
access-list 101 permit ip 197.7.0.0 0.0.255.255 any
!
route-map BGP permit 10
match ip address 101
set origin igp
You can configure it for specific networks with an ACL or for AS's with
regular expressions in an as path list.
I hope it helps
GIL
CCNA,CCDA
-----Original Message-----
From: Yee, Jason [mailto:[EMAIL PROTECTED]]
Sent: Monday, August 28, 2000 8:34 AM
To: '[EMAIL PROTECTED]'
Subject: Origin attribute in bgp
hi ,
Anyone knows what the origin attribute in bgp used for and how is it used?
thanks
Jason
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