If you are looking for an MPLS Tutorial or step by step mpls configuration examples, this basic MPLS VPN configuration example will guide you from configuring the first router to a 3 router MPLS core with 2 external sites.
If are you looking for an explanation of MPLS then I would advise you read the “What is MPLS” post first before attempting this lab.
Cisco MPLS Configuration Video
The entire tutorial is covered in this video above so if you like to just watch the video is there, if you want to follow along I suggest you open this page twice or print it out so you can make notes.
Building the simple MPLS topology below this will consist of a 3 router MPLS core and two remote sites in the same VRF running OSPF as the PE-CE routing protocol. This will be quite a long post as I will be taking you through every single verification along the way to ensure you understand how each section works.
I will be using GNS3 and configuring the routers as we go so you can follow along.
I have also started to get into Network Automation – if this is more your thing check out my pages on Ansible for Network Engineers
Cisco MPLS Tutorial Topology
Step 1 – IP addressing of MPLS Core and OSPF
First bring 3 routers into your topology R1, R2, R3 position them as below. We are going to address the routers and configure ospf to ensure loopback to loopback connectivity between R1 and R3
R1 hostname R1 int lo0 ip add 1.1.1.1 255.255.255.255 ip ospf 1 area 0 int f0/0 ip add 10.0.0.1 255.255.255.0 no shut ip ospf 1 area 0 R2 hostname R2 int lo0 ip add 2.2.2.2 255.255.255.255 ip ospf 1 are 0 int f0/0 ip add 10.0.0.2 255.255.255.0 no shut ip ospf 1 area 0 int f0/1 ip add 10.0.1.2 255.255.255.0 no shut ip ospf 1 area 0 R3 hostname R3 int lo0 ip add 3.3.3.3 255.255.255.255 ip ospf 1 are 0 int f0/0 ip add 10.0.1.3 255.255.255.0 no shut ip ospf 1 area 0
You should now have full ip connectivity between R1, R2, R3 to verify this we need to see if we can ping between the loopbacks of R1 and R3
R1#ping 3.3.3.3 source lo0 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds: Packet sent with a source address of 1.1.1.1 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 40/52/64 ms R1#
You could show the routing table here, but the fact that you can ping between the loopbacks is verification enough and it is safe to move on.
Step 2 – Configure LDP on all the interfaces in the MPLS Core
In order to run MPLS you need to enable it, there are two ways to do this.
- At each interface enter the mpls ip command
- Under the ospf process use the mpls ldp autoconfig command
For this tutorial we will be using the second option, so go int the ospf process and enter mpls ldp autoconfig – this will enable mpls label distribution protocol on every interface running ospf under that specific process.
R1 router ospf 1 mpls ldp autoconfig R2 router ospf 1 mpls ldp autoconfig R3 router ospf 1 mpls ldp autoconfig
You should see log messages coming up showing the LDP neighbors are up.
R2# *Mar 1 00:31:53.643: %SYS-5-CONFIG_I: Configured from console *Mar 1 00:31:54.423: %LDP-5-NBRCHG: LDP Neighbor 1.1.1.1:0 (1) is UP R2# *Mar 1 00:36:09.951: %LDP-5-NBRCHG: LDP Neighbor 3.3.3.3:0 (2) is UP
To verify the mpls interfaces the command is very simple – sh mpls interface
This is done on R2 and you can see that both interfaces are running mpls and using LDP
R2#sh mpls interface Interface IP Tunnel Operational FastEthernet0/0 Yes (ldp) No Yes FastEthernet0/1 Yes (ldp) No Yes
You can also verify the LDP neighbors with the sh mpls ldp neighbors command.
R2#sh mpls ldp neigh
Peer LDP Ident: 1.1.1.1:0; Local LDP Ident 2.2.2.2:0
TCP connection: 1.1.1.1.646 - 2.2.2.2.37909
State: Oper; Msgs sent/rcvd: 16/17; Downstream
Up time: 00:07:46
LDP discovery sources:
FastEthernet0/0, Src IP addr: 10.0.0.1
Addresses bound to peer LDP Ident:
10.0.0.1 1.1.1.1
Peer LDP Ident: 3.3.3.3:0; Local LDP Ident 2.2.2.2:0
TCP connection: 3.3.3.3.22155 - 2.2.2.2.646
State: Oper; Msgs sent/rcvd: 12/11; Downstream
Up time: 00:03:30
LDP discovery sources:
FastEthernet0/1, Src IP addr: 10.0.1.3
Addresses bound to peer LDP Ident:
10.0.1.3 3.3.3.3
One more verification to confirm LDP is running ok is to do a trace between R1 and R3 and verify if you get MPLS Labels show up in the trace.
R1#trace 3.3.3.3 Type escape sequence to abort. Tracing the route to 3.3.3.3 1 10.0.0.2 [MPLS: Label 17 Exp 0] 84 msec 72 msec 44 msec 2 10.0.1.3 68 msec 60 msec *
As you can see the trace to R2 used an MPLS Label in the path, as this is a very small MPLS core only one label was used as R3 was the final hop.
So to review we have now configured IP addresses on the MPLS core, enabled OSPF and full IP connectivity between all routers and finally enabled mpls on all the interfaces in the core and have established ldp neighbors between all routers.
The next step is to configure MP-BGP between R1 and R3
This is when you start to see the layer 3 vpn configuration come to life
Step 3 – MPLS BGP Configuration between R1 and R3
We need to establish a Multi Protocol BGP session between R1 and R3 this is done by configuring the vpnv4 address family as below
R1# router bgp 1 neighbor 3.3.3.3 remote-as 1 neighbor 3.3.3.3 update-source Loopback0 no auto-summary ! address-family vpnv4 neighbor 3.3.3.3 activate R3# router bgp 1 neighbor 1.1.1.1 remote-as 1 neighbor 1.1.1.1 update-source Loopback0 no auto-summary ! address-family vpnv4 neighbor 1.1.1.1 activate *Mar 1 00:45:01.047: %BGP-5-ADJCHANGE: neighbor 1.1.1.1 Up
You should see log messages showing the BGP sessions coming up.
To verify the BGP session between R1 and R3 issue the command sh bgp vpnv4 unicast all summary
R1#sh bgp vpnv4 unicast all summary BGP router identifier 1.1.1.1, local AS number 1 BGP table version is 1, main routing table version 1 Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 3.3.3.3 4 1 218 218 1 0 0 03:17:48 0
You can see here that we do have a bgp vpnv4 peering to R3 – looking at the PfxRcd you can see it says 0 this is because we have not got any routes in BGP. We are now going to add two more routers to the topology. These will be the customer sites connected to R1 and R3. We will then create a VRF on each router and put the interfaces connected to each site router into that VRF.
Step 4 – Add two more routers, create VRFs
We will add two more routers into the topology so it now looks like the final topology
Router 4 will peer OSPF using process number 2 to a VRF configured on R1. It will use the local site addressing of 192.168.1.0/24.
R4 int lo0 ip add 4.4.4.4 255.255.255.255 ip ospf 2 area 2 int f0/0 ip add 192.168.1.4 255.255.255.0 ip ospf 2 area 2 no shut R1 int f0/1 no shut ip add 192.168.1.1 255.255.255.0
Now at this point we have R4 peering to R1 but in the global routing table of R1 which is not what we want.
We are now going to start using VRF’s
What is a VRF in networking?
Virtual routing and forwarding (VRF) is a technology included in IP (Internet Protocol) that allows multiple instances of a routing table to co-exist in a router and work together but not interfere with each other.. This increases functionality by allowing network paths to be segmented without using multiple devices.
As an example if R1 was a PE Provider Edge router of an ISP and it had two customers that were both addressed locally with the 192.168.1.0/24 address space it could accommodate both their routing tables in different VRFs – it distinguishes between the two of them using a Route Distinguisher
So back to the topology – we now need to create a VRF on R1
For this mpls tutorial I will be using VRF RED
R1 ip vrf RED rd 4:4 route-target both 4:4
The RD and route-target do not need to be the same – and for a full explanation please read this post on Route Distinguishers
Route Distinguisher vs Route Target before proceeding.
So now we have configured the VRF on R1 we need to move the interface F0/1 into that VRF
R1 int f0/1 ip vrf forwarding RED
Now notice what happens when you do that – the IP address is removed
R1(config-if)#ip vrf fo R1(config-if)#ip vrf forwarding RED % Interface FastEthernet0/1 IP address 192.168.1.1 removed due to enabling VRF RED
You just need to re-apply it
R1 int f0/1 ip address 192.168.1.1 255.255.255.0
Now if we view the config on R1 int f0/1 you can see the VRF configured.
R1 R1#sh run int f0/1 Building configuration... Current configuration : 119 bytes ! interface FastEthernet0/1 ip vrf forwarding RED ip address 192.168.1.1 255.255.255.0 duplex auto speed auto end R1#
Now we can start to look int VRF’s and how they operate – you need to understand now that there are 2 routing tables within R1
- The Global Routing Table
- The Routing Table for VRF RED
If you issue the command sh ip route this shows the routes in the global table and you will notice that you do not see 192.168.1.0/24
R1#sh ip route Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set 1.0.0.0/32 is subnetted, 1 subnets C 1.1.1.1 is directly connected, Loopback0 2.0.0.0/32 is subnetted, 1 subnets O 2.2.2.2 [110/11] via 10.0.0.2, 01:03:48, FastEthernet0/0 3.0.0.0/32 is subnetted, 1 subnets O 3.3.3.3 [110/21] via 10.0.0.2, 01:02:29, FastEthernet0/0 10.0.0.0/24 is subnetted, 2 subnets C 10.0.0.0 is directly connected, FastEthernet0/0 O 10.0.1.0 [110/20] via 10.0.0.2, 01:02:39, FastEthernet0/0 R1#
If you now issue the command sh ip route vrf red – this will show the routes in the routing table for VRF RED
R1#sh ip route vrf red % IP routing table red does not exist
NOTE: The VRF name is case sensitive!
R1#sh ip route vrf RED Routing Table: RED Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set C 192.168.1.0/24 is directly connected, FastEthernet0/1 R1#
We just need to enable OSPF on this interface and get the loopback address for R4 in the VRF RED routing table before proceeding.
R1 int f0/1 ip ospf 2 area 2
You should see a log message showing the OSPF neighbor come up
R1(config-if)# *Mar 1 01:12:54.323: %OSPF-5-ADJCHG: Process 2, Nbr 4.4.4.4 on FastEthernet0/1 from LOADING to FULL, Loading Done
If we now check the routes in the VRF RED routing table you should see 4.4.4.4 in there as well.
R1#sh ip route vrf RED Routing Table: RED Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route Gateway of last resort is not set 4.0.0.0/32 is subnetted, 1 subnets O 4.4.4.4 [110/11] via 192.168.1.4, 00:00:22, FastEthernet0/1 C 192.168.1.0/24 is directly connected, FastEthernet0/1 R1#
We now need to repeat this process for R3 & R6
Router 6 will peer OSPF using process number 2 to a VRF configured on R3. It will use the local site addressing of 192.168.2.0/24.
R6 int lo0 ip add 6.6.6.6 255.255.255.255 ip ospf 2 area 2 int f0/0 ip add 192.168.2.6 255.255.255.0 ip ospf 2 area 2 no shut R3 int f0/1 no shut ip add 192.168.2.3 255.255.255.0
We also need to configure a VRF onto R3 as well.
R3 ip vrf RED rd 4:4 route-target both 4:4
So now we have configured the VRF on R3 we need to move the interface F0/1 into that VRF
R3 int f0/1 ip vrf forwarding RED
Now notice what happens when you do that – the IP address is removed
R3(config-if)#ip vrf forwarding RED % Interface FastEthernet0/1 IP address 192.168.2.1 removed due to enabling VRF RED
You just need to re-apply it
R3
int f0/1
ip address 192.168.2.1 255.255.255.0
Now if we view the config on R3 int f0/1 you can see the VRF configured.
R3 R3#sh run int f0/1 Building configuration... Current configuration : 119 bytes ! interface FastEthernet0/1 ip vrf forwarding RED ip address 192.168.2.1 255.255.255.0 duplex auto speed auto end
Finally we just need to enable OSPF on that interface and verify the routes are in the RED routing table.
R3 int f0/1 ip ospf 2 area 2
Check the routes in vrf RED
R3
R3#sh ip route vrf RED
Routing Table: RED
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
Gateway of last resort is not set
6.0.0.0/32 is subnetted, 1 subnets
O 6.6.6.6 [110/11] via 192.168.2.6, 00:02:44, FastEthernet0/1
C 192.168.2.0/24 is directly connected, FastEthernet0/1
R3#
Ok so we have come a long way now let’s review the current situation. We now have this setup
R1,R2,R3 form the MPLS Core and are running OSPF with all loopbacks running a /32 address and all have full connectivity. R1 and R3 are peering with MP-BGP. LDP is enabled on all the internal interfaces. The external interfaces of the MPLS core have been placed into a VRF called RED and then a site router has been joined to that VRF on each side of the MPLS core – (These represent a small office)
The final step to get full connectivity across the MPLS core is to redistribute the routes in OSPF on R1 and R3 into MP-BGP and MP-BGP into OSPF, this is what we are going to do now.
We need to redistribute the OSPF routes from R4 into BGP in the VRF on R1, the OSPF routes from R6 into MP-BGP in the VRF on R3 and then the routes in MP-BGP in R1 and R3 back out to OSPF
Before we start lets do some verifications
Check the routes on R4
R4#sh ip route
4.0.0.0/32 is subnetted, 1 subnets C 4.4.4.4 is directly connected, Loopback0 C 192.168.1.0/24 is directly connected, FastEthernet0/0
As expected we have the local interface and the loopback address.
When we are done we want to see 6.6.6.6 in there so we can ping across the MPLS
Check the routes on R1
R1#sh ip route 1.0.0.0/32 is subnetted, 1 subnets C 1.1.1.1 is directly connected, Loopback0 2.0.0.0/32 is subnetted, 1 subnets O 2.2.2.2 [110/11] via 10.0.0.2, 00:01:04, FastEthernet0/0 3.0.0.0/32 is subnetted, 1 subnets O 3.3.3.3 [110/21] via 10.0.0.2, 00:00:54, FastEthernet0/0 10.0.0.0/24 is subnetted, 2 subnets C 10.0.0.0 is directly connected, FastEthernet0/0 O 10.0.1.0 [110/20] via 10.0.0.2, 00:00:54, FastEthernet0/0
Remember we have a VRF configured on this router so this command will show routes in the global routing table (the MPLS Core) and it will not show the 192.168.1.0/24 route as that is in VRF RED – to see that we run the following command
R1#sh ip route vrf RED Routing Table: RED 4.0.0.0/32 is subnetted, 1 subnets O 4.4.4.4 [110/11] via 192.168.1.4, 00:02:32, FastEthernet0/1 C 192.168.1.0/24 is directly connected, FastEthernet0/1
Here you can see Routing Table: RED is shown and the routes to R4 are now visible with 4.4.4.4 being in OSPF.
So we need to do the following;
- Redistribute OSPF into MP-BGP on R1
- Redistribute MP-BGP into OSPF on R1
- Redistribute OSPF into MP-BGP on R3
- Redistribute MP-BGP into OSPF on R3
Redistribute OSPF into MP-BGP on R1
R1 router bgp 1 address-family ipv4 vrf RED redistribute ospf 2
Redistribute OSPF into MP-BGP on R3
R3 router bgp 1 address-family ipv4 vrf RED redistribute ospf 2
This has enabled redistribution of the OSPF routes into BGP. We can check the routes from R4 and R6 are now showing in the BGP table for their VRF with this command
sh ip bgp vpnv4 vrf RED
R1#sh ip bgp vpnv4 vrf RED BGP table version is 9, local router ID is 1.1.1.1 Status codes: s suppressed, d damped, h history, * valid, > best, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path Route Distinguisher: 4:4 (default for vrf RED) *> 4.4.4.4/32 192.168.1.4 11 32768 ? *>i6.6.6.6/32 3.3.3.3 11 100 0 ? *> 192.168.1.0 0.0.0.0 0 32768 ? *>i192.168.2.0 3.3.3.3 0 100 0 ?
Here we can see that 4.4.4.4 is now in the BGP table in VRF RED on R1 with a next hop of 192.168.1.4 (R4) and also 6.6.6.6 is in there as well with a next hop of 3.3.3.3 (which is the loopback of R3 – showing that it is going over the MPLS and R1 is not in the picture)
The same should be true on R3
R3#sh ip bgp vpnv4 vrf RED BGP table version is 9, local router ID is 3.3.3.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path Route Distinguisher: 4:4 (default for vrf RED) *>i4.4.4.4/32 1.1.1.1 11 100 0 ? *> 6.6.6.6/32 192.168.2.6 11 32768 ? *>i192.168.1.0 1.1.1.1 0 100 0 ? *> 192.168.2.0 0.0.0.0 0 32768 ?
Which it is! 6.6.6.6 is now in the BGP table in VRF RED on R3 with a next hop of 192.168.2.6 (R6) and also 4.4.4 is in there as well with a next hop of 1.1.1.1 (which is the loopback of R1 – showing that it is going over the MPLS and R2 is not in the picture)
The final step is to get the routes that have come across the MPLS back into OSPF and then we can get end to end connectivity
R1 router ospf 2 redistribute bgp 1 subnets R3 router ospf 2 redistribute bgp 1 subnets
If all has worked we should be now able to ping 6.6.6.6 from R4
Before we do let’s see what the routing table looks like on R4
R4#sh ip route 4.0.0.0/32 is subnetted, 1 subnets C 4.4.4.4 is directly connected, Loopback0 6.0.0.0/32 is subnetted, 1 subnets O IA 6.6.6.6 [110/21] via 192.168.1.1, 00:01:31, FastEthernet0/0 C 192.168.1.0/24 is directly connected, FastEthernet0/0 O E2 192.168.2.0/24 [110/1] via 192.168.1.1, 00:01:31, FastEthernet0/0
Great we have 6.6.6.6 in there
Also check the routing table on R6
R6#sh ip route 4.0.0.0/32 is subnetted, 1 subnets O IA 4.4.4.4 [110/21] via 192.168.2.1, 00:01:22, FastEthernet0/0 6.0.0.0/32 is subnetted, 1 subnets C 6.6.6.6 is directly connected, Loopback0 O IA 192.168.1.0/24 [110/11] via 192.168.2.1,00:01:22,FastEthernet0/0 C 192.168.2.0/24 is directly connected, FastEthernet0/0
Brilliant we have 4.4.4.4 in there so we should be able to ping across the MPLS
R4#ping 6.6.6.6 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max= 40/48/52ms
Which we can – to prove this is going over the MPLS and be label switched and not routed, lets do a trace
R4#trace 6.6.6.6 Type escape sequence to abort. Tracing the route to 6.6.6.6 1 192.168.1.1 20 msec 8 msec 8 msec 2 10.0.0.2 [MPLS: Labels 17/20 Exp 0] 36 msec 40 msec 36 msec 3 192.168.2.1 [MPLS: Label 20 Exp 0] 16 msec 40 msec 16 msec 4 192.168.2.6 44 msec 40 msec 56 msec R4#
More MPLS Configuration Resources
Want to learn more about MPLS? Check out these other great posts on MPLS configuration and troubleshooting.
- MPLS LDP Troubleshooting – This postscovers some basic MPLS LDP Troubleshooting commands and how to use them.
- Route Distinguisher vs Route Target – This post covers the difference between the RD & RT values – and no they are no the same thing!
In the next MPLS Tutorial I will add a second customer site into the mix and also go through some MPLS Troubleshooting where I will go through turning off different features and trying to break the MPLS and show you the logical steps to troubleshoot it.
If you have enjoyed this tutorial, please take a minute to enter your name and email below to be kept up to date on new articles and upcoming training courses.
Multiprotocol Label Switching (MPLS) is a way of routing traffic within a telecommunications network that directs data from one node to the next based path labels rather than long network addresses, It also allows the sharing of address space for clients as it is labels that are being routed not prefixes.
MPLS was designed to work in a multiple protocol environment. Today, MPLS is used to support metro-Ethernet services & mobile communications back-haul it’s main benefit is the ability to have two clients using the same address space and routing over the service provider network as they are routing using labels and not prefixes.
No, MPLS is a method to route networks across a service provider network, routing protocols like OSPF and BGP are used to make MPLS work. MPLS operates using BGP and typically uses OSPF to exchange routes with the customer.
Roger
Rogers' CCIE Journey | About Roger | Contact | Twitter | Linkedin
Hi Roger,
Very nice and self explanatory tutorial. But then what’s happen when you added two more routers. Is it possible for you to write and explain further more. Thanks
Habib,
The tutorial is complete now
Hello Roger,
I am Oussema from Tunisia and I have found this tutorial very useful for me. Thanks for this post.
Would you mind send me the GNS3 config files for this lab please? I would be so grateful.
Regards,
Oussema
Thank you Oussema, I will add the GNS3 files to the post soon
Roger
Thanks very much, you made this really simple and easy to understand.
Glad it helped Shawn
awaiting the vrf’s configurations
Shawn,
There was a delay in writing this post but it is complete now
while adding last two routers in topology, i.e; R4 and R6, how to configure with the given ip?
how to configure R4 and R6? with the ip 192.168.1.0/24 and 192.168.2.0/24?
please help. thankyou
Rex,
These are the subnets of the links – each router is configured with an address from that subnet
R4 f0/0 192.168.1.4
R6 f0/0 192.168.1.6
HTH
I have a question.
Is it necessary a Routing protocol between R1 and R2 to become LDP neighbours?
According to the theory, BGP runs over TCP same as LDP. Therefore, both should act in the same way, or am I wrong?
George,
You need the routing protocol to get the loopback addresses routable so you can peer MP-BGP between R1 and R3
For R1 and R2 to become an LDP neighbor you don’t need a routing protocol but this is just a small part of the picture.
You have to use a routing protocol for the loopbacks
Hello , i repeated the process for R6 but still i am not able to ping from r4 to r6 loopbacks
R3#sh ip route vrf RED
Routing Table: RED
6.0.0.0/32 is subnetted, 1 subnets
O 6.6.6.6 [110/2] via 192.168.2.5, 00:04:32, FastEthernet1/0
C 192.168.2.0/24 is directly connected, FastEthernet1/0
how do i get 4.4.4.4 route on r3 vrf red ?
what am i missing ?
Ateet,
I have updated the tutorial and it is now complete, please review the last steps again and let me know if you get any issues
Just a note/Query, Shouldn’t the loopback address of R3 be a /32 so that may be why you cant ping across. The initial config lists setting it with a 255.255.255.0 mask but should be 255.255.255.255 as below instead ?
R3
hostname R3
int lo0
ip add 3.3.3.3 255.255.255.255
Thank you Chris, you are correct, the loopbacks should all be /32 🙂
I have updated the post
Roger
Hi roger
thanks this was great explanation.
regards
kamogelo
HI Roger,
You spoke of additional information such as
In the next MPLS Tutorial I will add a second customer site into the mix and also go through some MPLS Troubleshooting where I will go through turning off different features and trying to break the MPLS and show you the logical steps to troubleshoot it. Im interested in the troubleshooting, where can I find this?
Thank you
BTW the tutorial was great, a lot to take in, but I loved that you went from start to finish.
Thank You Michael,
I am glad you enjoyed the tutorial, I will be putting up a video of the entire process soon and then as promised the second video, but I have just changed jobs so it might be a few weeks.
thanks
Excellent work…it was very useful and self explanatory…thanks
hi there, excellent lab, not sure why i cannot type in small caps in this comment box.
I spotted a minor error in the diagram after the sentence
“Ok so we have come a long way now let’s review the current situation. We now have this setup
”
In the diagram, R3 F0/1 interface is shown as 192.168.2.3 but in your lab configuration, it is 192.168.2.1.
Hi Lawrence,
Thanks config updated
Great JOB!!!
excellent tutorial for those who want to start playing with MPLS !
simple, easy to replay and very didactic…
One idea would be to reuse that lab to implement some IP Multicast stuff 🙂
Stephane
Excellent tutorial. I have PRACTISED and verified all steps in GNS3.
simply amazing – end-to-end mpls configuration!
thanks roger.
Thank you soo much!!! This lab was very to follow.
Glad it helped!
Great tutorial!. Good job :).
Glad it helped!
Really good tutorial – made the distinction and interaction between MPLS, VRFs, and BGP very easy to see in action.
Thanks John, glad it helped!
Nice tutorial, well explained.
This one really helped me understanding a few things about mpls and route advertisements in vRF’s.
Thanks Walter, glad it helped
Great Post! thanks
No problem Manny, I am glad it helped your understanding of a simple MPLS Configuration
Thanks very much, I am just re-learning my way around MPLS so this was a great refresh. I got caught out on GNS3 playing games with me and dropping the LDP config in OSFP so it all looked good except in the core. I am just going to expand out now to BGP but thanks for taking the time to document this so well.
Nice article, helpful which covers three topic at once MPLS / MPBGP & VRF great 🙂
Toward tHE VERY END, YOU DO THIS ‘SHOW’ ON R1 AND R3
R1#SH IP BGP VPNV4 VRF RED
R3#sh ip bgp vpnv4 vrf RED
BOTH HAVE A COMMENT THAT READS: (which is the loopback of R1/r3 – showing that it is going over the MPLS and R1 is not in the picture)
SHOULDN’T THAT READ …”AND R2 IS NOT IN THE PICTURE” ???
IT DOESN’T MAKE SENSE THAT both lines WOULD read ” R1 IS NOT IN THE Picture.”
also this is in all caps for some reason, not my choice, lol.
You are correct! thanks I have updated the post
Thanks
THANK YOU SO MUCH SIR FOR THIS AMAZING DOCUMENTATION YOU’VE HELPED ME IN MY THESIS THANK YOU SO MUCH !
simple and very easy to understandable.
Thank you for this post !!!
Great, glad it helped
Hi man, congratulations for your explanation.
I would like to know what is the “session manager”, that you use to configure devices.
How can i use session manager to configure devices in the gns3?
It’s securcrt – https://www.vandyke.com/products/securecrt/ The only SSH client I use!
Nice work!!!
No problem Andrew, glad it helped