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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109 views

Overutilized spikes on a 128k circuit

If I have a client on a 128k MPLS circuit going through a Cisco 2900 router and using QoS that's splitting it up into two 64k tunnels, is it possible for traffic to spike up to 256k for a short period ...
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1answer
125 views

Is MPLS a total different network then internet? [closed]

If I need to connect my two sites through a secured MPLS connection and I call a service provider to install one for me so will they connect me to a total different network cloud where they have only ...
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1answer
854 views

2547oDMVPN with Loopback as iBGP source interface

I've been trying to get 2547oDMVPN with 'mpls nhrp' setup in a VIRL environment and I have gotten it to work with some of the examples I've seen online, but all the examples online have had the hub as ...
4
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1answer
89 views

PVC not Accepted by CISCO 878

I have the following config. set up for an MPLS network on my CISCO 878: Current configuration : 941 bytes ! version 12.4 no service pad service timestamps debug datetime msec service timestamps log ...
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1answer
467 views

Cisco 878 Router MPLS WAN Configuration [closed]

I'm a network-naive telecom guy. I have a Cisco 878 router. My duty is to set up some configuration on it with the following parameters: MPLS Settings: LAN IP: 123.123.123.123 / 1 WAN IP: 456.456.456....
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2answers
28k views

What is an "Internet breakout"

I was asked this by a friend. His company is trying to set up some sort of a network where all their branches around the world can connect. They want to know if there are any laws in my country ...
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0answers
523 views

vMX L3 MPLS VPN routes not in forwarding table

I'm new to juniper technology and I'm trying to set up mpls vpn on vMX. Not sure if I'm missing something in configuration or if this is some kind of bug in vMX or if this is not supported on vMX. As ...
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2answers
2k views

In MPLS VPN, Which one become first? MPLS Label tag or VPN encapsulation?

In MPLS VPN network, which one is the first thing to do? I mean label tagging is first or VPN encapsulation is first? If you can, please explain about this case.
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1answer
333 views

Metro Ethernet no layer 3 connectivity

We're working with a metro ethernet provider to bring up a new multi-point connection between our sites. Currently we're just trying to get it working with two sites. As a simple test I've plugged in ...
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2answers
1k views

Connecting two OSPF sites both directly and via MPLS

Here at Stack Exchange, we recently added an MPLS link between data centers to supplement the VPN tunnels that we had been using up until now. The network looks like this: +-----------+ ...
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5answers
3k views

How to check MPLS connections?

I monitor about 150 routers with MPLS links. To check if connection is established, I'm pinging loopbacks visible only from WAN. If a loopback is not responding, I can see which link is not working ...
5
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1answer
701 views

LDP VPLS - Packet behavior within bridge-groups and bridge-domains

I have a pair of ASR9k's that I plan on migrating to Juniper MX960's. Below is a piece of the configuration: l2vpn bridge group VPLS_1 bridge-domain 101 interface TenGigE0/2/0/0.101 ! ...
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1answer
130 views

Why we need traffic be evenly distributed to LSPs in MPLS-TE?

I'm studying basics of inter-datacenter network. I know the ECMP idea and it's popular to combine ECMP and MPLS. I want to know the motivation of load-balancing all the LSPs. I think the reason is ...
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1answer
953 views

MPLS routing: how are packets routed in the interior network (third party equipment)

Is it correct to assume that MPLS edge routers can route packets into and through third party networks? By this I mean, networks that are not label switched networks. The diagrams they show of the ...
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2answers
4k views

Why are my equal cost LSP's not load balancing equally when using auto-bandwidth?

First, I'm adding this question and answering myself because this type of behavior was absolutely no where to be found, hopefully it will help someone. Problem: We use auto bandwidth to handle the ...
4
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2answers
595 views

MPLS lable generation - PE-P-PE routing

I'm doing some tests in my lab preparing for CCIE R&S and I'm diving into how MPLS works and I ran into a issue with getting traceroute to display the label path in it's output. I have not found ...
5
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1answer
2k views

RSVP between Cisco and Juniper

I can not configure the RSVP between Cisco6509 SUP2T and Juniper MX480. Prior to that set up the neighbor 3 without problems. Now that it is impossible ...I do not understand why :( scheme: Cisco t5/...
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1answer
2k views

Maximum number of MPLS VPNs provided by a router?

What's the maximum amount of MPLS VPNs a router can provide? Is it 2^20 = ~1 million = the maximum amount of different MPLS labels?
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1answer
2k views

Terminating an L2VPN on JunOS router

I am trying to terminate an L2VPN on an MX480 but it's not working... Topology: 7206 trunk vlanid 555 > MX80> MPLS CLOUD > MX480. 7206 (192.168.254.2) not pinging lt-interface on MX480 (192.168.254....
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1answer
499 views

MPLS-TE backup LSP protection behavior

I'm trying to learn more about MPLS-TE, specifically how packets are routed once the TE LSP is set up. Most of the examples I could find that include the MPLS label stack shown are examples for Fast ...
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2answers
191 views

Is this MPLS Router configuration correct?

I am currently trying to understand MPLS and its component. So I read myself through a few book, took a look at the question on how to determine the LER and the there suggested MPLS FAQ For Beginners ...
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2answers
853 views

How does frame relay and MPLS fit in with BGP and WAN/internet/cloud routing? [closed]

I'm getting the small picture stuff, but there's this big picture I don't understand. Vids and Network+ materials talk about frame relay and MPLS as WAN technologies. My first thought is... isn't ...
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2answers
5k views

Regarding MPLS L2 Vs L3

I'm studying about MPLS Network, i've doubt on that i.e., what is the difference between MPLS Layer-2 Vs Layer-3 Network ?
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1answer
894 views

MPLS load balancing on Huawei S5700

On a L3 switch there are two equal cost ISIS routes. Destination/Mask Proto Pre Cost Flags NextHop Interface 10.150.4.12/32 ISIS-L2 15 10 D 10.200.15.42 Vlanif27 ...
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2answers
2k views

Cisco VPNv4 over eMPBGP

IMPORTANT UPDATE: So I have worked out that the PE is in fact forwarding the updates to the route reflector. The issue seems to be to do with what rd I am looking at. You see part of this scenario ...
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1answer
1k views

Configuring a second MPLS connection for our backup Data center (BGP Closed User Group)

I'm a bit new to BGP and need a little assistance with a configuration change. We are currently using our MPLS connection for all traffic to all sites. Going forward We would want to segragate the ...
2
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3answers
326 views

Network performance when gateway connection is 100Mbps

I am trying to do a bit of planning and would like some clarification. Will the overall network speed be degraded when the default gateway port speed is only 100Mbps? For instance. Our network has a ...
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3answers
239 views

Can different networks connected by MPLS run the same OSPF area?

I was wondering if two different OSPF areas connected via an MPLS/GRE tunneled link run OSPF across them? May be keeping the interconnecting MPLS/GRE routers in OSPF backbone area 0?
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3answers
2k views

Adtran NetVanta router on MPLS network can only reach other MPLS sites if source address set

I have an MPLS network with 5 remote locations with 1544 routers, our central office, and our data center. All of the traffic from the remote locations routes out the central office unless it goes ...
4
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4answers
315 views

Subnetting Issue with legacy network and poor planning

A client of mine is part of a bigger group of companies running a MPLS for connectivity. My Clients IP Address range is 192.168.13.0/24. We use this with DHCP and MASK of 255.255.255.0 and our ...
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2answers
4k views

Do MPLS LSRs require a Layer 3 IP routing protocol?

Recently I've been trying to get my head around MPLS, it's a part of the project we're doing. During one of our meetings one of the participant ask a question: Since LSRs doesn't check IP routing ...
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1answer
631 views

EoMPLS, MSTP, and RPVST

We are looking at Cisco ME3600 to provide connectivity between our datacenter fabrics for some software defined networking. Due to the platform having a higher limitation on EoMPLS xconnects than ...
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0answers
329 views

Where can I find MPLS/BGP VPNv4 labels through SNMP (cisco IOS router)?

I'm implementing SNMP and i've been digging through MIBs for the past few days. I have managed to extract the equivalent of the show command 'show mpls forwarding-table' through the 'MplsLsrMib', but ...
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1answer
1k views

How can I view not-accessible SNMP indexes? MPLS implementation

We are trying to rebuild a few cisco show commands with SNMP OID information. Right now i'm working on MPLS and i'm trying to get the In/Out label info. I keep running into the same problem, the ...
6
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1answer
1k views

Is it possible to stitch a L2VPN connection into a VPLS domain on Juniper MX

I'm trying to connect one end of a L2VPN tunnel to a VPLS instance on a Juniper MX router. The L2VPN should act like a local interface in the VPLS instance. Is this possible at all? I can't find any ...
4
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1answer
4k views

load-balancing on congestion, OSPF over MPLS

I have a network of routers with two clients at both ends, as shown in the Figure below. All the routers use OSPF routing protocol over IP, and the three routers inside the "MPLS backbone" subnetwork ...
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0answers
819 views

Juniper SRX MPLS Egress Prioritization

I can't for the life of me to get any egress queue prioritization to happen on an SRX. I have a single label switched path out of the SRX, and a couple of ethernet-ccc's. One ccc is entirely ...
8
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1answer
2k views

Cannot Load Internal Website over MPLS

We have an MPLS set up between two subnets. Everything (that is, I have RDP both directions as well as file-sharing) seems to be working correctly except for two things, which may be related. ...
2
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2answers
346 views

Help with bringing DR site in to general network

I hope I can get some help as I've been wracking my brain to figure out the best way to get a new MPLS connection set up between our main site and our DR site. I'll first give a description of what I ...
4
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2answers
247 views

If PHP is enabled, can Egress LER distinguish if a packet has arrived via MPLS-LSP or not?

Consider the topology below. ---> traffic flow direction ---> ---> PE-1-----P1-----P2-----PE-2 ---> Here PE-1 is the ingress LER and PE-2 is the egress LER. P1 and P2 are LSRs. Now say ...
6
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2answers
601 views

MPLS can reroute, but can it route?

I have 4 Cisco routers, connected one to another like the following: **R1**(s1/0)--(s1/0)**R2**(s1/1)--(s1/0)**R3**(s1/1)--(s1/0)**R4** All of them have an IP address assigned on their interfaces. ...
5
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1answer
645 views

Cisco 7600 MUX-UNI on SRE IOS?

I know that MUX-UNI can only be configure on a 7600 running certain IOS version, SR and SX I believe. Does that not include SRE? Logged into a 7600 running 12.2(33)SRE9a, with the following ...
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2answers
1k views

How are the LERs determined in an MPLS LSP using LDP

Preface; In the below topology R1 and R6 are PEs, all others are P routers, all routers are running c7200-jk9s-mz.124-13b.bin. At this point IGP is fully converged (OSPF with all interfaces in area 0 ...
9
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2answers
918 views

Label to Route mapping, Label generation scalability

In MPLS enabled routers, is a unique label generated per Destination prefix in routing Table or is it per Next-hop in the routing table if not both, how is the mapping between unique labels and ...
6
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1answer
4k views

What is a FEC in MPLS domain?

Does FEC correspond to a Next-hop ipaddress or Destination Ipaddress or a combination of Next-hop/Destination Ipaddress and QOS values ?
5
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1answer
519 views

Can 2 peering LSR generate same Label to same or different prefix and distribute among them?

Scope of the MPLS labels are within a router or within a interface right ?. So which means the peering neighbor LSR router can generate label values of its own.So say with below mpls topology. |LSR1|-...
6
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1answer
3k views

Is it possible to run an IPv6 only MPLS core?

I am looking for information on whether it is actually possible to run an IPv6 only MPLS Core with respect to the transport labels, without the current requirement to tunnel across IPv4. To put this ...
15
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3answers
22k views

MPLS vs Encrypted VPNs - traffic security?

Why do people say a lot of times that they have two connections between two offices - the main one being over MPLS and the backup one over VPN. Why not run a VPN over MPLS too? Is MPLS secure? Can no ...
2
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1answer
1k views

IPv6: to VRF or not to VRF

Been discussing this with people and reading up, would like people's thoughts on whether or not its worth running IPv6 in a VRF or just let it loose in the global routing table. Even though ...
8
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3answers
15k views

What is the difference between VPLS vs Layer 2 VPN?

Apologies about the very open ended question, but I am struggling to differentiate between VPLS & L2 VPN's. I'm aware they both run over MPLS, but I can't find any documentation or sites that ...