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://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://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://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://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://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://onlinestudylist.com/mailman/listinfo/ccie_rs
