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
