On Dec 12, 2012, at 4:27 PM, Peter Psenak wrote: > Hi Hannes, > > please see inline: > > On 12.12.2012 15:49, Hannes Gredler wrote: > >> >> for the OSPF routing protocol: >> >> A PLR router should connect to the address >> >> traffic-engineering deployments: > > why do we need to distinguish between TE and non-TE deployments?
for OSPF things are less ambiguous than for IS-IS, agreed. for IS-IS the advantage of TE extensions is really that it serves as an explicit identifier of a node, if this router-ID has got IP reachability as well then its usually the transport IP address; for OSPF we have the router-ID in every type-1 LSA for IS-IS we don't. > All we need in rLFA context is a reachable IPv4 address advertised by PQ > node. That should be independent of TE being deployed or not. by ensuring a deterministic address selection you safe T-LDP sessions: if any source address can connect to any destination address then you have doubled the overall number of T-LDP by two. however if you ensure that all nodes agree to use a single IP address then you only need one T-LDP for a given source/destination router pair. > >> - reported in the Router Address TLV (Type 10 LSA) and >> - router (Type 1 LSA) ) stub network advertisement and >> - the address mask is 255.255.255.255 >> >> or >> >> non-traffic-engineering deployments: >> - reported in the router-id field of the Type-1 LSA) >> - the router (Type 1 LSA) stub network advertisement and >> - the address mask is 255.255.255.255 > > can we say that the PQ node address used for targeted LDP session is selected > in following order of preference: > > 1. PQ node OSPF router-id, if it is advertised as /32 prefix by the PQ node > itself > > 2. Highest /32 address advertised by PQ node in it's Router LSA 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 >> >> </added-text> >> >> tx, >> >> /hannes >> _______________________________________________ >> rtgwg mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/rtgwg >> >> > > > _______________________________________________ rtgwg mailing list [email protected] https://www.ietf.org/mailman/listinfo/rtgwg
