[j-nsp] Optimizing the FIB on MX

[Alexander Marhold]

Hi folks

To make the discussion clearer and comming back to the Juniper MX 104 implementation

Here is a picture of 2 PEs on P  and 2 peers (ISP1 and IX1)
let´s assume we want to prefer routes from IX1 over ISP1
MX1 is EBGP (lpref 100) to  ISP1 and IBGP to MX2 and MX3
MX2 is EBGP (lpref 110) to IX1 and IBGP to MX1 and MX3

  ISP1                   IX1
    | locpref         ^ locpref 
    |   100              |   110
   MX1--------->-MX2
    |                               |
    |                               |
    +------MX3--->--+


In my opinion if you need also  the MX3 then  for this MX3 you need "PIC-CORE" to quickly switch between both paths

On MX1 you need "best-external" to advertise the external routes whereas the best is the internal route pointing to MX2

On MX1 and MX2 you need "PIC-EDGE" to quickly switch when IX1 goes down

Do we all agree on that picture and the named mechanisms ( put in "") ?


So now what versions of Junos is needed and what additional "unnecessary" methods like MPLS or LDP is now needed ?

regards

alexander