1) On PE1 vrf description customer rd 1:1 route-target both 1:1 route-target import 1:2 On PE2 vrf description customer rd 1:2 route-target both 1:2 route-target import 1:1
In a multipath instance PE1 will install the Equal Cost route with rd 1:1 first, using 1:2 as a secondary path only. Opposite on PE2. 2) Could use different VRF's. Just like dual carriers. A key concern is a dual failure, site 1 on network 1 and site 2 on network 2. The customer will need to provide a path between the two networks via one of their sites. David -- http://dcp.dcptech.com > -----Original Message----- > From: jack daniels [mailto:[email protected]] > Sent: Thursday, March 25, 2010 2:41 PM > To: David Prall > Cc: [email protected] > Subject: Re: [c-nsp] PFR Question > > Hi David , > > thanks man I got the basic idea :) > > 1) but please explain in more detail this > > Single VRF, 2 distinct RD's. The VRF imports both, exports one. The > RD's are > different so that multipath can be used within the core typically. But > in > this case they wouldn't use multipath and the local RD would be used as > the > determining factor on import of which route is installed first.?????? > > > 2) Also if I use diffrent VRF for CE4---CE2 path that will also work - > ?? > > > On Thu, Mar 25, 2010 at 11:57 PM, David Prall <[email protected]> wrote: > > > If the link goes away, then the update should be pretty quick. > > Single VRF, 2 distinct RD's. The VRF imports both, exports one. > The RD's are > different so that multipath can be used within the core > typically. But in > this case they wouldn't use multipath and the local RD would be > used as the > determining factor on import of which route is installed first. > > The local CE (CE3) is probing for the subnet at CE1. When it is > no longer > reachable by CE3 it will move the route to CE4. As long as CE4 is > using CE2 > as the path via the cloud then no issue. > > > David > > -- > http://dcp.dcptech.com <http://dcp.dcptech.com/> > > > > -----Original Message----- > > From: jack daniels [mailto:[email protected]] > > > Sent: Thursday, March 25, 2010 2:19 PM > > To: David Prall > > Cc: [email protected] > > Subject: Re: [c-nsp] PFR Question > > > > > If a single carrier, then the CE4/CE2 path needs to be via > > a second RD so that the paths within the carrier are preferred > and the > > same > > will happen.???? > > DO YOU mean we need to have diifrent vrf on secondry end to end > path. > > > > I didnt get this if single carrier as link PE1 and CE1 link > fails > > ....CE3 send traffic for X.X.X.X to PE3.PE3 still has next hop > in its > > vrf table as PE1.... > > > > > > > > > > Please help me as still confused if two carriers , how will > this > > hhappen > > > > > > On Thu, Mar 25, 2010 at 11:29 PM, David Prall <[email protected]> > wrote: > > > > > > Is MPLS Domain a single carrier, or two carriers. If two > carriers > > then the > > CE3/CE4 site will see that they can't reach via CE3/CE1 > path and > > switch over > > to CE4/CE2 path. If a single carrier, then the CE4/CE2 > path needs > > to be via > > a second RD so that the paths within the carrier are > preferred > > and the same > > will happen. PfR is providing end-to-end reachability > information > > in this > > case, and based on that changing the local routing table. > > > > David > > > > > > -- > > > http://dcp.dcptech.com <http://dcp.dcptech.com/> > <http://dcp.dcptech.com/> > > > > > > > > -----Original Message----- > > > > > From: jack daniels [mailto:[email protected]] > > > Sent: Thursday, March 25, 2010 1:07 PM > > > To: David Prall > > > Cc: [email protected] > > > Subject: Re: [c-nsp] PFR Question > > > > > > > > But if you have -- > > > > > > > > > |CE1--------PE1 > > > PE3--------CE3 > > > X.X.X.X---------| -------------------- > MPLS > > DOMAIN----- > > > -------------- > > > | CE2--------PE2 > > > PE4--------CE4 > > > > > > > > > Now my primary link is CE1-PE1 and secondary is CE2-PE2 > > > If my CE1-PE1 goes down i route traffic via CE2- > PE2<<<<<<I > > understand > > > this ok... > > > > > > when traffic from CE3 for X.X.X.X reaches PE3 , next > hop is > > still PE1 ( > > > as MPBGP has not converged so fast in MPLS domain of > SP) ...so > > how will > > > traffic be forwareded , as PFR claims 3 sec. > > > > > > > > > On Thu, Mar 25, 2010 at 10:16 PM, David Prall > <[email protected]> > > wrote: > > > > > > > > > PfR is a unidirectional feature. The router on > the other > > end > > > needs to be > > > configured with PfR as well in order to have > > bidirectional > > > visibility. > > > Typically the master controller will be local to > the > > site. > > > > > > -- > > > > > http://dcp.dcptech.com <http://dcp.dcptech.com/> > <http://dcp.dcptech.com/> > > <http://dcp.dcptech.com/> > > > > > > > > > > > > > > > -----Original Message----- > > > > From: [email protected] > [mailto:cisco- > > nsp- > > > > [email protected]] On Behalf Of jack > daniels > > > > Sent: Thursday, March 25, 2010 12:35 PM > > > > To: [email protected] > > > > Subject: Re: [c-nsp] PFR Question > > > > > > > > dear guys, > > > > > > > > is my mail being delivered to group as no one > replied. > > > > > > > > On Wed, Mar 24, 2010 at 11:42 PM, jack daniels > > > > <[email protected]>wrote: > > > > > > > > > Hi Network champs, > > > > > > > > > > I'm stuck in understanding of PFR . Docs say > it > > converges in > > > 3 sec ( > > > > for > > > > > realtime traffic VOICE )... > > > > > > > > > > I understand you can send traffic out > secondry link > > but what > > > about > > > > traffic > > > > > which has to come back from remote end ( for > which SP > > has not > > > > converged). > > > > > > > > > > But if you have -- > > > > > > > > > > > > > > > > > > > > |CE1--------PE1 > > > > > PE3--------CE3 > > > > > X.X.X.X---------| ---------- > -------- > > --MPLS > > > > > DOMAIN------------------- > > > > > | CE2--------PE2 > > > > > PE4--------CE4 > > > > > > > > > > > > > > > Now my primary link is CE1-PE1 and secondary > is CE2- > > PE2 > > > > > If my CE1-PE1 goes down i route traffic via > CE2- > > PE2<<<<<<I > > > understand > > > > this > > > > > ok... > > > > > > > > > > > > > > > BUT MY QUESTION IS - > > > > > > > > > > PE3 and PE4 ( for this VRF) still has NOW > converged > > the BGP > > > and still > > > > for > > > > > it next hop for X.X.X.X is PE1. So how fwd > can happen > > in 3 > > > sec untill > > > > > Service providers all routers dont converge > and > > understand > > > that CE1- > > > > PE1 link > > > > > is down. > > > > > > > > > > > > > > > Regards > > > > > > > > > > > > > > > > > _______________________________________________ > > > > cisco-nsp mailing list cisco- > [email protected] > > > > https://puck.nether.net/mailman/listinfo/cisco- > nsp > > > > archive at > http://puck.nether.net/pipermail/cisco-nsp/ > > > > > > > > > > > > > > > > > > > > > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
