Can't see the topology but one thing is for sure ... once you configure "vrf" on a PE ... it will not accept any LSA 3 from the CE if the same CE has one of it's leg in area 0 connecting to internal network. I think it is because the PE router will become an ABR.
Topology: Area 0 --- CE --- Area X ---- PE ------ SUPER-BACKBONE ------ PE ---- AREA Y --- CE --- AREA Y I I I----------------------------------------------------------------------------------------------------------------------------------I Is your topology some what like this? I am sort of visualising it this way. Best to hand over the topology with where is what running to comment further. On Tue, Nov 20, 2012 at 9:37 AM, <[email protected]> wrote: > Thanks Jeff, that makes sense... Without the sham link, the customer > routers never even sees the routes coming in from the PE. With the sham > link, they are advertised from the PE to CE as type 1 or type 2 LSA's, > so we can adjust the cost of the backdoor path and/or MPLS path to > control how traffic is routed. > > Doug > > > -------- Original Message -------- > Subject: Re: [OSL | CCIE_RS] OSPF behavior with MPLS VPN, backdoor > link, no sham link > From: Jeff Andiorio <[email protected]> > Date: Mon, November 19, 2012 10:42 am > To: Michael Davis - Webquor <[email protected]> > Cc: "[email protected]" <[email protected]>, > "[email protected]" <[email protected]> > > This link does call out the PE will not create a Type3 LSA if Type 1 > is received from the site. > > > http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/L3VPNCon.html > > Jeff > > On Thu, Nov 15, 2012 at 4:40 PM, Michael Davis - Webquor > <[email protected]> wrote: > > Thanks Doug that seems to make sense. I will give your gns3 topology a go > > > > Sent from my iPhone > > > > On 15/11/2012, at 11:36 PM, "[email protected]" <[email protected]> > wrote: > > > >> Actually, I mean the OSPF routes (originating from the remote customer > >> site, advertised across the back-door link to the local CE, and then > >> advertised to the local PE) have an AD of 110, while the BGP routes > >> (advertised via OSPF from the remote site CE to the the remote PE, then > >> redistributed into BGP and advertised to the local PE) have an AD of > >> 200. So the PE selects the OSPF routes to insert into the VRF routing > >> table, and the BGP routes never get re-distributed. > >> > >> Here's a link to the GNS3 topology I'm using for this. Have a quick > >> look, it will make much more sense than my rambling on... > >> http://gns3vault.com/MPLS/advanced-mpls-vpn.html > >> > >> Thanks, > >> > >> Doug > >> > >> > >> > >> > >> -------- Original Message -------- > >> Subject: Re: [OSL | CCIE_RS] OSPF behavior with MPLS VPN, backdoor > >> link, no sham link > >> From: Steve Storniak <[email protected]> > >> Date: Thu, November 15, 2012 7:23 am > >> To: "[email protected]" <[email protected]>, > >> "[email protected]" <[email protected]> > >> > >> Did you mean local CE routes (internal) have high priority over BGP > >> routes(external) per ospf route selection process? > >> > >> > >> > >> Steve > >> > >> > >> From: [email protected] <[email protected]>; > >> To: <[email protected]>; > >> Subject: Re: [OSL | CCIE_RS] OSPF behavior with MPLS VPN, backdoor > >> link, no sham link > >> Sent: Thu, Nov 15, 2012 11:05:13 AM > >> > >> Specifying the both external and internal types when re-distributing > >> into MP-BGP doesn't seem to make a difference. Since they are all > >> internal routes, the distribution works without specifying the route > >> types, as evidenced by the Type 3 LSA's and O IA routes showing up when > >> I shut down the back-door link. > >> > >> But I think I have the answer... Here's an excerpt from "sh ip bgp vpnv4 > >> vrf MELON" from the PE router that connects to one customer site, let's > >> call it "Customer Site A". This was taken while the back-door link was > >> up: > >> > >> *> 12.12.12.12/32 192.168.23.2 111 32768 ? > >> * i 5.5.5.5 11 100 0 ? > >> > >> And here an excerpt from "show ip route vrf MELON" for the same route: > >> > >> O 12.12.12.12 [110/111] via 192.168.23.2, 00:00:04, Ethernet0/3 > >> 13.0.0.0/32 is subnetted, 1 subnets > >> > >> 192.168.23.2 is the CE router at "Customer Site A", while 5.5.5.5 is the > >> PE router loopback that connects to "Customer Site B" and 12.12.12.12 is > >> the loopback of the CE router at "Customer Site B". > >> > >> Only active routes, present in the VRF's routing table, are > >> re-distributed. Since the OSPF routes from the local CE have a lower AD > >> than the BGP routes from the other site, the OSPF routes are active in > >> the VRF's routing table, not the BGP routes. So the BGP routes from the > >> other site coming across the MPLS VPN never get redistributed into OSPF, > >> so the LSA's don't get created. > >> > >> Does this sound correct? > >> > >> Doug > >> > >> > >> > >> > >> -------- Original Message -------- > >> Subject: Re: [OSL | CCIE_RS] OSPF behavior with MPLS VPN, backdoor > >> link, no sham link > >> From: Greg Chisholm <[email protected]> > >> Date: Wed, November 14, 2012 8:21 pm > >> To: [email protected] > >> > >> On 11/14/2012 05:12 PM, [email protected] wrote: > >>> I'm working on a sham link lab, and came across some behavior I don't > >>> understand. I've got the MPLS L3VPN built, and routes are being learned > >>> across it properly. Everything is in area 0, and I've used the same > >>> process ID for the vrf on both PE's. I do not have the sham link > >>> configured yet, so all traffic is going over the back-door link. > >>> > >>> The thing I don't understand is that there are no Type3 LSA's anywhere, > >>> not on the CE routers, nor on the PE vrf's. I only see type 1 and Type > 2 > >>> LSA's. If I shut down the back-door link, the Type 3's show up, along > >>> with the O IA routes as expected. > >>> > >>> I would think that while the back-door is up, we would see the Type 2 > >>> LSA's coming across the back-door link, as well as the Type 3 LSA's > >>> being redistributed from MP-BGP. > >>> > >>> What am I missing? > >>> > >>> Thanks, > >>> > >>> Doug > >>> _______________________________________________ > >>> For more information regarding industry leading CCIE Lab training, > please visit www.ipexpert.com > >>> > >>> Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com <http://www.platinumplacement.com/> > >>> > >>> http://onlinestudylist.com/mailman/listinfo/ccie_rs > >> > >> Look at your redistribution in BGP, you need to specify the types of > >> OSPF routes with redistribute ospf > >> _______________________________________________ > >> For more information regarding industry leading CCIE Lab training, > >> please visit www.ipexpert.com > >> > >> Are you a CCNP or CCIE and looking for a job? Check out > >> www.PlatinumPlacement.com <http://www.platinumplacement.com/> > >> > >> http://onlinestudylist.com/mailman/listinfo/ccie_rs > >> _______________________________________________ > >> For more information regarding industry leading CCIE Lab training, > >> please visit www.ipexpert.com > >> > >> Are you a CCNP or CCIE and looking for a job? Check out > >> www.PlatinumPlacement.com <http://www.platinumplacement.com/> > >> > >> http://onlinestudylist.com/mailman/listinfo/ccie_rs > >> _______________________________________________ > >> For more information regarding industry leading CCIE Lab training, > please visit www.ipexpert.com > >> > >> Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com <http://www.platinumplacement.com/> > >> > >> http://onlinestudylist.com/mailman/listinfo/ccie_rs > > _______________________________________________ > > For more information regarding industry leading CCIE Lab training, > please visit www.ipexpert.com > > > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com <http://www.platinumplacement.com/> > > > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com <http://www.platinumplacement.com/> > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > -- Samir Idris _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
