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.

Filter by
Sorted by
Tagged with
0
votes
0answers
20 views

Hide hops (private networks) from a customer's traceroute

As a carrier I would like to hide certain hops in our network/MPLS ring, e. g. private networks from a customer's traceroute. Basically, I want to go from traceroute 50.50.50.2 traceroute to 50.50....
0
votes
1answer
25 views

Is it mandatory to upgrade backup ILL connection when MPLS circuit is upgraded?

In our office we have both MPLS and ILL connection. We recently upgraded our office MPLS bandwidth connection from 20 Mbps to 50 Mbps. Currently 20 Mbps ILL connection we have. Is it mandatory to ...
1
vote
1answer
59 views

Does CSR1000v on AWS support IPv6?

I'm trying to implement Segment Routing IPv6 (SRv6) in Cisco CSR1000v on AWS. I'm having issues with IPv6 which gave the impression that IPv6 data plane does not work. Similarly, I configured a ...
1
vote
1answer
53 views

LDP: which FEC an egress router has to advertise when using Ordered Control?

If an egress router knows how to reach a set of distinct and indipendent networks (say, two or more non overlapping IP prefixes in its routing table), is it expected to announce one single FEC for ...
2
votes
1answer
33 views

LDP: which FEC to advertise when using Ordered Control?

I have the following doubt: if an egress router knows how to reach a set of subnets, is it expected to bind all those remote destinations in just a FEC (one label) or has it to bind a label for each ...
2
votes
1answer
80 views

Next protocol in MPLS header

How come MPLS header has no next protocol ID field? How can a parser tell for sure which protocol is next? BOS field only indicates that the next header is not MPLS, which is not enough to ...
2
votes
1answer
104 views

Should the Loopback address be unique across the network?

I have an MPLS network where every site has two PEs for redundancy. and I want to configure a set of loopback interfaces on every PE router for routing traffic between different VRFs. is it possible ...
3
votes
2answers
79 views

MPLS labels between CE and PE

What use cases are there for MPLS labels to be exchanged between CEs and PEs? I'm seeing Carrier Supporting Carrier (Carriers' Carrier) as a potential use case, but are there others? EDIT: I have ...
0
votes
0answers
267 views

Creating an overlay network using ASA and VXLAN over IP MPLS

I need to extend an existing VLAN from a branch LAN to DC. As a matter of fact I noticed that Cisco ASA 5500X have VXLAN capabilities. I am relatively new to VXLAN and I need some help to find the ...
0
votes
1answer
54 views

Usable IP addresses and MPLS

I work at a company where I am partly responsible for IT, just because I'm semi technical and we're not big enough to warrant a dedicated role for someone else. I was asked to look into upgrading out ...
5
votes
3answers
421 views

Traceroute doesn't show one hop?

I have an interesting issue where my traceroute skips one hop on the way. I do not know why but it seems to be some kind of Juniper behaviour which I do not understand yet. Blue routers are Cisco ...
4
votes
1answer
73 views

Extending a subnet across a WAN link vs routing

probably a noob question but any help is appreciated. Question: What are the disadvantages of spanning L2 subnets across a WAN as opposed to a routed connection? Background: I've got a client who's ...
2
votes
1answer
385 views

What is the difference between LFA and FRR?

I have troubles in understanding what is the difference between these two technologies in MPLS networks. Assuring backup path Are they used for the same thing? Or maybe FRR uses LFA for calculating ...
1
vote
1answer
229 views

BGP Juniper not reflecting to Cisco?

I am really new to working with Junipers and I am struggling a bit with Route Reflector configuration. I have 3 routers Cisco-Juniper-Juniper2 here is my config: Cisco: router bgp 100 neighbor ...
0
votes
1answer
40 views

IGP vs LDP forwarding

By default when MPLS and LDP is configured in a cisco IOS/IOSXR and some IGP. If I forward a packet toward internal IP. Router will use MPLS to get destination. When show the routing table I only can ...
1
vote
1answer
233 views

What is the difference between L2VPN and EoMPLS?

Quick terminology question: It appears as though L2VPN describes a group of technologies. Ethernet over Multiprotocol Label Switching (EoMPLS) is one of these technologies. VPLS and Pseudowire are ...
-2
votes
1answer
35 views

Super-noob asked to build a WAN [closed]

Worst case scenario here - software/sysadmin IT guy being asked to build a future proof WAN for 5-6 large sites over 50 mile radius. Must be end-to-end secure as will include personal and medical data....
2
votes
1answer
125 views

Why do we need MPLS when implementing L2/L3 VPNs?

Yes, I know that MPLS doesn't care about L3 and higher levels and it is one of its features. But I do not really understand its role in L2/L3 VPNs. L2VPN - we are building xconnects to PE's AC. Why ...
1
vote
1answer
65 views

from where/how is the figure of 50 m sec protection switching time calculated in case of ERP/ MPLS?

From where or how does the figure of 50 m sec protection switching calculated for MPLS/ ERPS?
1
vote
2answers
80 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 ...
2
votes
3answers
212 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
4
votes
2answers
229 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 ...
1
vote
1answer
7k 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 ...
1
vote
0answers
50 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 ...
1
vote
1answer
64 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. ...
2
votes
1answer
95 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 ...
3
votes
1answer
60 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 ...
5
votes
2answers
615 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 ...
3
votes
1answer
761 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 ...
4
votes
1answer
414 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 ...
2
votes
3answers
4k 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 ...
1
vote
1answer
230 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....
1
vote
1answer
141 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 ...
1
vote
1answer
281 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 ...
1
vote
2answers
379 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 ...
0
votes
2answers
376 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 ...
2
votes
1answer
675 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 ...
2
votes
1answer
888 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 ...
1
vote
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 ...
1
vote
1answer
149 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, ...
2
votes
2answers
80 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?
0
votes
1answer
80 views

Why use MPLS to connect 3 private fiber rings?

Why use MPLS to connect 3 private fiber rings? My customer would like to use MPLS to connect 3 fiber rings using MPLS, this a private LAN/WAN and they will not be going outside of the network (...
1
vote
2answers
103 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 ...
0
votes
1answer
118 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 ...
2
votes
1answer
2k 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) ...
0
votes
1answer
44 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:...
1
vote
1answer
364 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 ...
1
vote
5answers
3k 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 ...
1
vote
2answers
244 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 ...
6
votes
3answers
419 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 ...