Hi! Dave Thanks for clarifying. So you mean BGP path selection tie breaker for IGP metric is happening in inet.3(LDP) but not inet.0(IGP like OSPF/IOSIS), so we need "track-igp-metric" to introduce metric into LDP for track-igp-metric. is it correct?
BR! James Chen On Sun, Aug 2, 2020 at 8:17 PM Dave Bell <[email protected]> wrote: > If you are running next hop self on your BGP routes at the edge, the best > path will be via a loopback in an LSP. > > If you have two identical routes, one of the tie breakers is IGP > preference. If that knob isn’t set the IGP cost will be 1 for everything, > and you will progress down to less helpful tue breakers like router id. > > Regards, > Dave > > On Sun, 2 Aug 2020 at 11:58, Chen Jiang <[email protected]> wrote: > >> Hi! Michael >> >> Thanks for your clarification. >> >> Sure, it will let LDP use IGP metric, but is there any benefit? >> >> Cause per my understanding LDP only works for label distributing, not path >> selection, and LDP always follows the IGP path, so what is the difference >> or benefit to add additional configuration knob to let LDP use IGP metric? >> >> BR! >> >> Chen Jiang >> >> On Sun, Aug 2, 2020 at 6:32 PM Michael Hallgren <[email protected]> wrote: >> >> > Hi James, >> > >> > From memory, Junos assigns metric 1 by default to "LDP routes", not IGP >> > metric, unless you push this button. >> > >> > Cheers, >> > mh >> > ------------------------------ >> > *De :* Chen Jiang <[email protected]> >> > *Envoyé :* dimanche 2 août 2020 12:10 >> > *À :* Juniper List >> > *Objet :* [j-nsp] track-igp-metric in LDP >> > >> > Hi! Experts >> > >> > Sorry for disturbing, I am curious about track-igp-metric knob under >> LDP, >> > is there any scenarios it will be useful? I think ldp is just a label >> > distribution protocol, the forwarding path always follows the IGP >> shortest >> > path, is there any benefit for using track-igp-metric? >> > >> > Thanks for your help! >> > >> > -- >> > BR! >> > >> > >> > >> > James Chen >> > _______________________________________________ >> > juniper-nsp mailing list [email protected] >> > https://puck.nether.net/mailman/listinfo/juniper-nsp >> > >> >> >> -- >> BR! >> >> >> >> James Chen >> _______________________________________________ >> juniper-nsp mailing list [email protected] >> https://puck.nether.net/mailman/listinfo/juniper-nsp >> > -- BR! James Chen _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
