07-20-2022 01:20 PM
Hello,
I am tasked with having to connect a whole new ISP to my already existing LAN during a change over. The sites are constantly feeding information and on a VRF (10.0.1.2 & 10.0.3.2) Which means, my old ISP pathway must remain online until all of the remote sites have switched over to the new ISP. Now, one ISP is in a closed off VRF (Site A to PE to CE). I need to have the new MPLS routed somehow to the same interface on my CE router (vice-versa) so that both MPLS connections are running at the same time and that from 10.10.100.2 they can reach both sites. I have attached a diagram, but I cannot figure out how to get both MPLS circuits to talk at the same time to 10.10.100.2. Is this as simple as IP route's? Am I missing something?
07-20-2022 01:58 PM
same site both MPLS,
try divide the router to two VRF one for each MPLS,
second for LAN config it in global and config static route toward VRF-MPLS1 and VRF-MPLS2.
NOTE:- LAB this before apply in real.
07-21-2022 07:46 AM
I'm going to try this one out. Now, here's the other issue: how do I route certain traffic toward MPLS B from the 10.10.100.2 and not have it try and go towards MPLS A? Traffic cannot be dropped. Because it seems a static route only get it to interface GE 0/2.
07-21-2022 02:12 AM
Hi
If all 3 interfaces is configured for the same vrf, it is just routing.
/Mikael
07-21-2022 02:23 AM
CE-PE
now you have multi home i.e. two PE?
if yes and you use BGP between your edge router and SP router then using LP prefer OLD path.
07-21-2022 09:04 AM
Hello
@michaelcarroll16725 wrote:
I am tasked with having to connect a whole new ISP to my already existing LAN during a change over. The sites are constantly feeding information and on a VRF (10.0.1.2 & 10.0.3.2) Which means, my old ISP pathway must remain online until all of the remote sites have switched over to the new ISP.
but I cannot figure out how to get both MPLS circuits to talk at the same time to 10.10.100.2
The current CE rtr has two EBGP peering towards two PE rtrs for subnets (10.0.1.0/30,10.0.3.0/30) which is clear, what isnt clear is then what you wish to do
Are you wanting to connect to a new isp/ on a new circuit from your CE rtr and keep the current routing path via the existing PE rtrs whilst the new ISP connection is soak tested?
07-21-2022 09:13 AM
I need to route certain destination IP's toward MPLS B from the 10.10.100.2 and not have it try and go towards MPLS A? Traffic cannot be dropped. Because it seems a static route only gets it to interface GE 0/2. As I transition sites over the site that need to go towards MPLS A still work. We are slowly transitioning to a new ISP.
07-21-2022 09:24 AM
I mention before use LP
but
use route-map as following
match ip prefix "prefix you want to pass through other MPLS"
set LP
that it, it will effect only one prefix other will have it defualt value 100.
07-21-2022 11:42 AM
Hello
I would say using weight on the specific received NLRIs would be the bgp attribute to use as it is not advertised to any other neighbor unlike local preference iand as you don’t have any ibgp peers it would be a preferred alternative and it is higher in the bgp best path selection process.
access-list 10 permit 10.0.3.0 0.0.0.3
route-map ISP2-Weight permit 10
match ip address 10
set weight 500000
route-map ISP2-Weight permit 99
router bgp xxxx
neighbor <isp2> x.x.x.x remote-as <ISP2>
neighbor <isp2> x.x.x.x route-map ISP2-Weight in
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide