Questions tagged [mpls]

For questions about Multi-Protocol Label Switching (MPLS), the layer 2.5 protocol used as a transport layer for Traffic Engineering, some Layer 2 & 3 VPN's, and VPLS.

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113 views

Are mpls tunnels the only option for reachable L3vpn next-hop?

If I have the following L3vpn topology: CE --- PE1 ---- PE2 --- CE *PE1 and PE2 are directly connected. *PE1 and PE2 exchange VPNv4 routes. *If PE1 and PE2 were to exchange transport labels for ...
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3answers
1k views

what is the role of IGP in MPLS network

what is the role of IGP in MPLS network to route the customer traffic or to make the reachability
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2answers
510 views

Pseudowire and LSP

I can't understand the concept of PW (pseudowire). Does making a pseudowire mean that we are making a dedicate path with reserved resources for a service with defined requirements? so What are its ...
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1answer
17k views

Difference between L2 VPN and L3VPN. How EVPN used with VxLAN and MPLS?

I am new to VPN technology and trying to connect and get the bigger picture after going through lot of online documents. Here are my confusions: Differences between L2 VPN and L3 VPN. It would be ...
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0answers
51 views

QOS - the need for it and verifying it

Just some straightforward questions, hope gurus here can shed some light 1) show int - output queue -> this is the hardware queue (tx-ring) or this is the software queue ? if I see drop, this means ...
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1answer
80 views

Can we use VRFs for BW preservation across the MPLS network?

I have some ingress untagged voice traffic coming through the MPLS network and obviously I have some concerns about this traffic being de-prioritised should there is congestion on the MPLS backhaul. ...
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1answer
153 views

What is a fractional port?

I was reading a product sheet about a Metro-Ethernet backhaul service which mentions, which is described as a mechanism to connect two datacentres within the same region (ie, city) via point-to-point ...
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1answer
88 views

why two VPN in VPN MPLS L3 can have same addresses?

I cant understand one thing, in this scenario: This is an schema of a layer 3 vpn using mpls. I dont understand why devices conncted to VPNa and VPNb can have the same addresses, I mean, how can PE's ...
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2answers
757 views

MPLS is used in whole internal network?

I configured MPLS/LDP in all interfaces of my testbed network. It is ran under IS-IS Level 1. I know and understand the benefits of MPLS (l3VPN or l2VPN). My question is : MPLS is used in whole ...
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1answer
1k views

SD-WAN vs MPLS VPN

Citing wikipedia on MPLS VPN There are three types of MPLS VPNs deployed in networks today: 1. Point-to-point (Pseudowire) 2. Layer 2 (VPLS) 3. Layer 3 (VPRN) I am confused about the difference ...
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1answer
567 views

Does LDP not generate a label for default route for ISIS Level 2?

LDP generates local bindings for all the routes in the routing table. I configured an ISIS topology such that: R1 ----- R2 ----- R3 ----- R4 ----- R5 L1 L1/2 L2 L1/2 L1 ...
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3answers
8k views

Why does MPLS need an IGP (like OSPF) in order to work?

I saw a network using MPLS, BGP and OSPF as main network protocols. I understand that BGP was used to exchange traffic with another AS, and OSPF was used as Internal Gateway Protocol. So, why to use ...
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1answer
437 views

SONET/T-Carrier differences - MPLS/VPLS bandwidth

Could someone explain to me simply what is the difference between SONET and T-Carrier? I know that the ISP generally uses SONET on their infrastructure (Ciscopress 2017, 1.2.1.2 section, http://www....
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1answer
271 views

Using an ASE(MPLS) line to route datacenter WAN traffic to office

im trying to route the Internet from our Datacenter to our Office over an AT&T ASE line (similar to an MPLS). At first I was going to just add the office subnets to the router in the datacenter ...
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2answers
454 views

WAN lines types - understanding leased line/circuit

Studying the WAN lines types, am I right regarding the statements below, or if not, could you correct me please: A real leased line, could be performed with TDM on a line with for example SDH, TDH or ...
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2answers
878 views

2 Gateways with 2 WAN connections on same subnet question

We recently got a new AT&T ASE(MPLS) line to connect our datacenter with our main office. We have a WAN connection at our datacenter and a WAN connection at the office. I want to setup 2 gateways ...
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3answers
945 views

Why VPWS service - MPLS has a two ethernet frame headers?

I am trying to understand VPWS services, and going through RFC 4448, Encapsulation Methods for Transport of Ethernet over MPLS Networks. Here is the packet capture: Why there is a need for again ...
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1answer
972 views

MPLS over GRE tunnel with Linux iproute2 [closed]

I'm trying to encapsulate IP packets in MPLS, transported over a GRE tunnel between two Linux hosts (a and b). a has 10.199.0.1 on GRE tunnel interface foo4, while b has 10.199.0.2 on GRE tunnel ...
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1answer
1k views

Juniper MX - vlan-ccc double tagged to untagged

On an interface to a customer of ours we configured double tagging. This interface is encapsulated with vlan-ccc because it is used in a l2circuit neighbor configuration. My question is: how can this ...
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1answer
1k views

What are some use cases of a labeled unicast AFI/SAFI(1/4)?

BGP can advertise a whole bunch of AFI/SAFIs, one of them is IPv4/IPv6 labeled unicast. I was wondering what are the practical applications of this kind of route? And how is it different from a VPN ...
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1answer
174 views

How to check whether there is traffic on EoMPLS L2VPN circuit?

I'm trying to check which of the virtual circuits are up, down and admin down. For example take this scenario. Here I have 6 VCs up and 4 down. I want to know what does it mean when it is down, ...
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2answers
104 views

How can I find out if a path across an internet uses MPLS?

Is there a way that I can find out (using a terminal cmd/util), if across an internet path that a datagram may travel, if there are routers that utilize MPLS?
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2answers
133 views

What does "transit" mean in the context of an MPLS network?

We've had a quote submitted by an ISP to change our current numerous Internet connections over to a managed MPLS network however on the quote it is mentioned that it includes "X mb of transit in our ...
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1answer
148 views

Pass traffic to ASA from Spokes via Hub

Good afternoon, The network will be MPLS in the future and I am thinking about new design for it. We will have hub router with ASA behind and couple spokes without the need for IPsec (at least for ...
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1answer
3k views

Can't ping between 2 CE routers even though routes exist in vrf routing table

I checked the vrf routing tables and the CE's network is present but I cannot ping it from anywhere. I will provide the PEs' configuration files and the CEs'. Any ideas? PE1 configuration file(R2) ...
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1answer
53 views

Route protocol based on network load

I am in search of a network protocol recommendation for the following scenario: I would like to have a load balance routing protocol that can alter the cost of a router based on its current load. eg:...
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1answer
556 views

Vrf-lite limitations on Cisco 6800

I wish to segment a network consisting on 150 tenant using vrf lite on Cisco 6800. The vrf configuration will be standalone as only the 6800 will be configured with vrf. Tenant's CPE will be connected ...
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5answers
5k views

Same subnet, two locations, BGP. Can it be done?

I am not sure this is possible, but I'd like to route traffic over an MPLS network using BGP to different locations, but use the same subnet. We have an east coast and west coast location. Each of ...
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2answers
287 views

Running office WAN via MPLS connected Datacenter's WAN connection. Thoughts?

Some folks at my work are thinking about getting rid of our office (HQ) WAN line from ATT, increasing the speed of our Datacenter connection and then running the office WAN(Internet) through an MPLS ...
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3answers
493 views

MPLS traffic engineering

While studying MPLS I couldn't understand it's one basic functionality. Mpls creates tunnel interfaces or pseudowires between label edge routers. To achieve traffic engineering I can set different ...
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2answers
271 views

Are all the private IPv6 addresses nonoverlapping? If yes, is Route distinguisher required for IPv6?

I am wondering if all the private IPv6 address non overlapping. And if yes, I am wondering if RD is required for IPv6 addresses. When two customer sites of an ISP are using same overlapping private ...
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0answers
321 views

Cannot Ping endpoints across a VPLS connected VLAN [closed]

Created a new VPLS Service first manually and then when it did not work reattempted with our Alcatel SAM 5620 to get a VLAN to pass end to end. Both configs look the same, neither the command line ...
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1answer
1k views

LDP based VPLS between Cisco IOS XE and Juniper MX

im struggeling in setting up LDP based VPLS in a Cisco/Juniper mixed vendor environment. The configuration is currently running between two Cisco Boxes, but i have to migrate on side to Juniper. ...
2
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1answer
162 views

Suggestions; changing enterprise ISP + current MPLS routing

My company currently has MPLS and DIA coming from one provider. The firewall allowing all the sites connected to break out onto the DIA is hosted in the MPLS cloud. Now we are upgrading our DIA, but ...
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2answers
755 views

Can I Use BGP as an IGP - Multisite w Redundant Layer 3 MPLS WANs

The requirements are Hundreds of sites. Each has a router and firewall and a switch stack. Layer 3 MPLS WAN with BGP to provider VRF. BGP as an IGP? iBGP Would you distribute a public ASN across all ...
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3answers
4k views

VPN Networking: How to span a /24 subnet across two locations?

How can I have a single /24 private IP address space that spans two locations across a VPN? aka VPLS Scenario: We have a /24: 192.168.100.0/24 that has workstations and servers on it. Servers are ....
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1answer
88 views

Use of BGP by Enterprise / Medium Businesses with Layer 3 MPLS WAN

Scenario: Assume no Internet connection for the sake of this question, the scenario is basic - 5 offices connected by an MPLS WAN. The customer is handed a Fast Ethernet (100Mbps) circuit at each ...
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1answer
150 views

Will i replace the MPLS cloud as a "P" router? [closed]

I'm following along with a MPLS problem. I have this topology... R1 is to reach R6 via an MPLS VPN and states that the MPLS cloud is to be configured with OSPF. All I want to know is, am i right in ...
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2answers
922 views

MPLS VPN network using BGP, RIP and OSPF

I'm working on configuring a MPLS VPN network. Here is what I'm working with: From CE1 I would like to be able to ping the loopback address of CE2 and vice versa, which is not yet possible and I do ...
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1answer
712 views

Managed MPLS CE router with BGP and OSPF

We have a scenario where a customer is having a managed L3VPN installed and would like to run OSPF internally. The issue is that the provider will not allow us to provide and manage the CE device and ...
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0answers
105 views

Can I run IPV6 L3VPN over MP-BGP IPV6?

I am looking for information about how to implement IPV6 L3VPN over MP-BGP IPV6 but i can see only IPV6 L3VPN over MP-BGP IPV4 (dual stack). When I implement ipv6 l3vpn over mp-bgp ipv4, I activate ...
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1answer
148 views

Query: Purpose of splitting circuit between MPLS/Internet [closed]

I have a new 100mb line at work that has a 80mb(MPLS)/20mb(Internet) split. I just want to confirm my understanding of this. The MPLS connects us to our HQ in London and with the current split that ...
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2answers
105 views

Does one need to personally manage MLPS VPN connection to have MPLS between building or can the ISP provide this connection for you?

There are 3 buildings (IT system) that need to be links together but the distance between them are very far apart (min between 230 - 470 km). How do one manage to provide connection between all of ...
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1answer
579 views

ISP's Customer wants to pass iBGP for his private IP addresses inside his WAN?

Customer has internal networks 10.0.0.0/16, 192.168.0.0/16. Has a network of VPN tunnels, an AT&T MPLS network, and a few Internet (public IP links) from me. I maintain an eBGP AS. He wants to ...
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2answers
3k views

Have I desiged correctly my MPLS network?

Here the diagram: I've been assigned to make a network where 3 headquearters are communicated securely, they must have internet connection and all of them must be able to access to the common servers ...
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1answer
1k views

understanding Policy map bandwidth , police, shape commands

Can some one please help me understand the below QOS setting on our MPLS router the service policy.. Policy map and class map I know the basic understanding behind how these work .. I need to in ...
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3answers
33k views

Differences between MPLS and VPLS

Can someone explain to me what differences there are between MPLS and VPLS? Which one is the most efficient? Why? I’ve read that the only difference is layer of technology: 2 (VPLS) vs 3 (MPLS). Does ...
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1answer
1k views

Vlan Extension vs VPLS + need understanding

I have tried to find the answer online and I was trying to make sure my understanding is correct. So if someone can point me to the correct path please do. My understanding of vlan extension are ...
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2answers
144 views

BGP Question please

Would like to ask a BGP question; in the first link picture there is no direct link on the two bottom layer3 switches but they form a ibgp neighbor with each other. In the second link picture, the ...
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0answers
158 views

VPLS interface on router switched to other interface on same router

I have a router, R1, that is serving as a default gateway on a network segment. Let's say port eth0 has an ip of 10.0.0.1/24 and is connected to a switch, S1. Another port on the router, eth1, is ...