[j-nsp] Help on BGP

[Hyunseog Ryu]

 From your statements, it seems that you need three options.
1) the best path routing info from both A and B to customers
2) BGP full routing table from ISP A to customers
3) BGP full routing table from ISP B to customers

In order to accomplish this all 3 options available,
you need to use L3VPN/VRF with a couple of different RIB implementation.

Setup the VRF for following.
1) ISP_A_BGP
2) ISP_B_BGP
3) UPSTREAM_BEST_PATH_BGP
4) CUSTOMER
5) CUSTOMER_ISP_A
6) CUSTOMER_ISP_B

For routing, you have to do following things.

1) when you receive full BGP routing table from ISP A, you can save ISP 
A full bgp routing table into ISP_A_BGP and UPSTREAM_BEST_PATH_BGP.


2) when you receive full BGP routing table from ISP B, you can save ISP 
B full bgp routing table into ISP_B_BGP and UPSTREAM_BEST_PATH_BGP.

3) when you have customer, who wants to receive the routing from both 
ISP A, and B, you needs to save customer routing to CUSTOMER.

4) when you have customer, who wants to receive the routing only from 
ISP A, you needs to save customer routing to CUSTOMER_ISP_A.

5) when you have customer, who wants to receive the routing only from 
ISP B, you needs to save customer routing to CUSTOMER_ISP_B.

6) For customer, who wish to receive best path routing from A and B, you 
need to send UPSTREAM_BEST_PATH_BGP, CUSTOMER, CUSTOMER_ISP_A, and 
CUSTOMER_ISP_B.

7) For customer, who wish to receive BGP routing only from A,  you need 
to send ISP_A_BGP, CUSTOMER, CUSTOMER_ISP_A, and CUSTOMER_ISP_B.


8) For customer, who wish to receive BGP routing only from B,  you need 
to send ISP_B_BGP, CUSTOMER, CUSTOMER_ISP_A, and CUSTOMER_ISP_B.

9) For ISP_A, you need to send CUSTOMER, CUSTOMER_ISP_A only.

10) For ISP_B, you need to send CUSTOMER, CUSTOMER_ISP_B only.


I think it is complex to implement, but I don't have much time to work 
on actual configuration to test it.
You can check Juniper System Engineer to do work on actual sample 
configuration for you.

If you wants to use logical router for this purpose,
that means you have to setup two BGP session for each ISP,
and I don't think any ISP allows multiple BGP sessions from single circuit.

Hyun



Tommy J wrote:
> Hello 
> 
> I am new to Junipers and I need help over a setup that
> I haven't done before. Any help will be more than
> appericated.
> 
> We are a small ISP running BGP4 on our M10i. We have
> two upstreams A and B who are providing us with a full
> internet routing table. And in turn we are acting as
> Transit to our customers and providing them a blended
> internet routing table with routes from both upstreams
> (The best path). 
> Now we are getting a demands from our customers who
> wants routes only from one upstream only i.e. non
> blended internet routing table either routes from ISP
> A or ISP B. How can I achieve this? 
> I did little research on this subject and logical
> routers seem to be an option. 
> 
> Any help on this will appreciated. 
> 
> Thanks 
> 
> Tommy 
> 
> 
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