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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36 views

Multiple AS MAN L3VPN network, vpnv4 vs EVPN [closed]

Under the context of a multitenant MAN (50k users) network deployment, we have an architecture formed by many privates AS (about 20 privates AS) attached to one public AS. This public AS is formed by ...
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1answer
33 views

Interconnecting sites with different networks and VLANs

I've got three sites, let's call them Production Plant, Remote 1 and Remote 2. They're not big networks. The Production Plant has two internal networks that has control systems designed for all being ...
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1answer
40 views

What is the difference between Targeted LDP and Directed LDP in MPLS?

Please explain the main differences (use cases) between Targeted LDP and Directed LDP in MPLS ?
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2answers
63 views

Do X.25/Frame Relay/ATM/MPLS have their own switches?

In the context of networking when we say "switch" we always think of Ethernet switch. But do we have X.25 switch, Frame Relay switch, ATM switch, and MPLS switch? If yes, how are they ...
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1answer
32 views

How are labels in LDP “Label Mapping Message” associated with IP prefix?

Let's say, that I have two directly connected routers r1 and r2. For example, I do see that the r2 sends a Label Mapping Message to r1 and provides several labels including 21(0x15): r1 associates ...
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33 views

Why does Junos create two entries in LIB for single tag- one with “S=0” and other with implicit “S=1”?

In the penultimate LSR there are following two entries for label 301040: root@r2> show route table mpls.0 protocol rsvp mpls.0: 14 destinations, 14 routes (14 active, 0 holddown, 0 hidden) + = ...
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1answer
23 views

Why are the LDP installed LSPs not seen in the output of “show mpls lsp” in Junos?

I have established a LDP session between routers r1(lo0.0 has 192.168.1.1 configured) and r4(lo0.0 has 192.168.1.4 configured). According to show route table inet.3 192.168.1.4 in r1 the BGP prefixes ...
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40 views

Juniper MX - ERPS over MPLS CCC or VPLS

I wonder if there is a possibility to implement an ERPS Ring over a few Juniper MX nodes that are interconnected via MPLS only? The only idea i have to configure this is using lt - interfaces with a ...
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1answer
115 views

What's the difference between L2TP and L2TPv3? [closed]

Is L2TPv3 an improvement of L2TP or a completely different technology? Other than "it scales better" and "the non-proprietary MPLS" I can't find much information about it that's ...
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22 views

How to compare two DSCP ? which one of DSCP 28 and 34 (decimal) has more priority?

How to compare two DSCP ? for example which one of DSCP 28 and 34 (decimal) has more priority ?
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1answer
85 views

Brocade L2VPN Route Reflector

I am trying to create an MPLS VPLS network where the VPLS instances are auto-discovered via BGP L2VPN. The issue I'm currently facing is that the routes are not reflected and there seems to be no ...
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51 views

Secure MPLS configuration: Does TCP port 646 (LDP) need to be generally exposed?

I am looking for expertise on MPLS configurations and security. A recent Nmap scan of my organization's public IPv4 perimeter networks has discovered a system which appears to be listening on TCP port ...
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47 views

Why is SD-WAN a more suitable option than MPLS for cloud? [closed]

I keep coming across the statement that because of the growth in cloud computing, SD-WAN is a more suitable option than MPLS for connecting remote sites. Can anyone give me an explanation why?
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130 views

Pros and cons of using VPLS instead of using MPLS alone

What are the pros and cons of using VPLS instead of MPLS alone? What are the typical cases where VPLS is used?
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2answers
83 views

MPLS : who owns the ingress & egress routers?

I'm trying to understand MPLS. It states that the routing doesn't happen at each router, and it starts with a "Label Edge Router". For example, if company X uses ATT as the provider for MPLS, then ...
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1answer
49 views

How MPLS solve the fragmentation problem?

MPLS appends a label for any packet enters its network. If a packet is equal to the maximum packet size, then packet may get fragmented after appending the label. How does MPLS solve this problem?
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1answer
30 views

Bandwidth limit between CPE and Provider Equipment

I have 4 different WAN links for redundancy one of them is 15mbps MPLS and the other ones are 30mbps Internet , 50 mbps Internet and 10 mbps MPLS , the way that it is set up is that we have load ...
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2answers
105 views

MPLS route-target export

"Route-target export" is used to export routes form VRF to mBGP - i need to know the rules which tells which routes will be exported. For example : if VRF-RED have 10 Routes which include static ...
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1answer
35 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 ...
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1answer
151 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 ...
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1answer
150 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 ...
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1answer
41 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 ...
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2answers
131 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 ...
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1answer
247 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 ...
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2answers
110 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 ...
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695 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 ...
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1answer
80 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 ...
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3answers
934 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
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1answer
108 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 ...
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1answer
943 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 ...
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1answer
372 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 ...
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1answer
69 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 ...
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1answer
597 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 ...
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1answer
39 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
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1answer
208 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 ...
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1answer
90 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?
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2answers
97 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
608 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
376 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
13k 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
75 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
131 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
77 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
698 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
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1answer
942 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
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1answer
522 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
6k 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
350 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
229 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 ...