Route servers are your friend here.
There are things like the U Oregon route server where you basically log in to a
Cisco like prompt and can use all your show commands and various match criteria
to display the parts of the table you care about. These servers usually have
many peers and have good visibility.
Another thing are obviously looking glasses although these are less
flexible. I think trace route.org used to have a decent collection.
You should be able with the looking glass on your target ISP though see your
routes installed and what bits they have set on them. It’s likely they are
playing with local pref in some way and using that to make routing decisions
instead of your AS prepends.
Thanks
Scott
> On Nov 3, 2015, at 9:15 AM, Nick Cutting <[email protected]> wrote:
>
> Good afternoon,
>
> I've have a datacenter that I have failed over to use our secondary link to
> the internet. At this location we only accept a default route from each
> carrier. Outbound was simply set with local pref.
>
> Inbound, I'm now sending a load of prepends and a last resort community.
> My clients connecting to various hosted services are generally using two
> major UK business internet carriers.
> One carrier - is working as expected and I can see best paths on the looking
> glass I expect.
>
> However the Other carrier's looking glass - which is what the other 40
> percent of clients use, is using the inbound route with multiple prepends and
> the last resort community.
>
> I have a ticket open with the carrier I wanted to make secondary inbound-
> (to check communities are being received and are correct).
> However, I was hoping to do some investigation myself for my own
> understanding as much as trying to fix this issue - while I wait for their
> reply.
>
> I imagine many people on this list have decent visibility as you probably
> have multiple peerings.
> What tools are out there that may help me with my limited visibility?
> I want to see the how the carriers that my clients are using are connected to
> my own upstream ISP's - I'm not sure how to go about this.
>
> Any tips or knowledge would be greatly appreciated. Also - I'm not sure what
> can be mentioned in these emails - in terms of who these carriers are.
>
> Thank you,
>
> Nick
>
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