the route is not in our bgprouter

Patrick Sumby patrick.sumby at sohonet.co.uk
Tue Oct 25 08:35:34 CDT 2011


If your provider has a looking glass then that is a good start to see if 
they have the route in their routing tables. http://www.traceroute.org/ 
is a good start for searching for a looking glass on their website.

Have you checked to see if you're actually recieving the route? You may 
be getting the route but not installing it into your routing table for 
some reason (eg invalid next hop or a router from another provider is 
being prefered). Do you have prefix lists inbound from your provider 
that could be blocking a route?

show ip route X.X.X.X
and
show ip bgp route X.X.X.X

will give different information.

If you've covered the above and not found the answer then try talking to 
your provider.

Regards
Patrick


On 25/10/2011 13:26, Deric Kwok wrote:
> Hi
>
> When we try to reach to outside ip, this route doesn't have in our bgp router
>
> How can we check whether it doesn't advertise from our upstream to us?
>
> Any web site and tools can help?
>
> Thank you
>




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