[j-nsp] improving global unicast convergence (with or without BGP-PIC)

[James Bensley]

On 2 May 2017 at 11:30,  <adamv0025 at netconsultings.com> wrote:
>> James Bensley
>> Sent: Tuesday, May 02, 2017 9:28 AM
>>
>> Just to clarify, one doesn't need to enable indirect-next-hop because it
> is
>> enabled by default, but if it were turned off for any reason, I presume it
> is a
>> requirement for PIC Edge? Or is it really not required at all, if not, how
> is the
>> Juniper equivilent working?
>>
> It's a requirement for PIC Edge (Egress PE or Egress PE-CE link failure) as
> well as for PIC Core (Ingress PE core link failure).
> To be precise it is required for in-place modification of the forwarding
> object to the backup/alternate node.
> So in a sense that applies for ECMP/LACP NHs a well the only difference is
> that both NH are in use in those cases -but you still need to be able to
> update all FIB records using them at once in case one of the NHs goes down.
>
>
>
>> Looking on juniper.net it looks like one exports multiple routes from the
> RIB
>> to FIB however assuming the weight == 0x4000 those additional paths won't
>> be used during "normal" operations, only during a failure, so we won't
>> actually get any per-packet load balancing (which would be undesirable for
>> us), is that correct?
> That precise.
>
> adam

Thanks!