Peter,

>From: Peter Psenak
>
>Hannes,
>
>On 12.12.2012 17:05, Hannes Gredler wrote:
>
>> in favor of explicit advertisement, i'd rather do 3 rules here :
>>
>> 1. PQ node OSPF router-id, if it is advertised as /32 prefix by the PQ node
>itself
>> 2. PQ node TE adress, if it is advertised as /32 prefix by the PQ node itself
>> 3.  Highest /32 address advertised by PQ node in it's Router LSA
>
>ether (1) or (3) is mandatory for the t-LDP session creation. (2) is
>optional and not sufficient for t-LDP session, so we can not have it
>before (3).
>
>It looks to me we are trying to solve the configuration problem which
>should not be addressed here.

It looks to me that we are trying to address the network management problem and 
deployability/interoperability in a multi-vendor network.
May be this can be done by configuration. In this case, could you please 
elaborate on what you propose?
Given that at least two routers (the PLR and the PQ) must agree on establishing 
the T-LDP session, there is a priori room for coordination. And given that a 
PLR (resp. PQ) needs to be able to use (resp. used) "any" PQ (resp. PLR), it 
seems useful that the same mechanism be shared by all PQs and PLRs, rathers 
than one relying on ISIS tag, another on order of IP addresses, another on 
static address range...
Hannes' request seems a relevant point to discuss on the mailing list and IMO 
the R-LFA draft should discuss this.
Even if the R-LFA proposition is not specific to a network environment (e.g. 
type of tunnels) the goal is to _deploy_ the R-LFA proposition. And that 
deployment will be a specific environment, where this is expected to work. I 
also think MPLS tunnels (LSPs) established by LDP seems a reasonably popular 
target deployment.

Unless it is believed that a local algorithm, without coordination between 
routers/vendor, can work in 100% of the cases. Is this your point?

Thanks,
Regards,
Bruno

>thanks,
>Peter
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