MPLS
MPLS
MPLS (Multiprotocol Label Switching) is a high-performance networking technology used by service providers and large businesses to move data efficiently across wide-area networks (WANs).
Instead of making routing decisions solely based on IP addresses, MPLS uses labels to quickly forward traffic through a network.
Think of MPLS Like a Highway System
Traditional Routing
At every router:
Plain Text
Packet arrives
↓
Router checks IP address
↓
Makes routing decision
Show more lines
Each router must examine the packet's destination.
MPLS Routing
Plain Text
Packet arrives
↓
Label attached
↓
Routers follow label
Show more lines
Routers simply read the label and forward the packet along a predetermined path.
This is much faster and more efficient.
How MPLS Works
Step 1: Packet Enters MPLS Network
Plain Text
Customer Network
|
MPLS Edge Router
Show more lines
A label is added:
Plain Text
IP Packet
↓
Label Added
Show more lines
Step 2: Travel Through MPLS Cloud
Plain Text
Label Router
|
Label Router
|
Label Router
Show more lines
Each router looks only at the label.
Step 3: Exit MPLS Network
Plain Text
MPLS Edge Router
|
Customer Network
Show more lines
The label is removed before delivery.
Basic MPLS Example
Plain Text
Chicago Office
|
MPLS Provider
|
Dallas Office
|
New York Office
Show more lines
All offices appear as if they are on one private network.
Why Businesses Use MPLS
Site-to-Site Connectivity
Connect multiple branch offices.
Plain Text
Branch A
|
MPLS
|
Branch B
Show more lines
Quality of Service (QoS)
MPLS can prioritize important traffic.
Example:
Plain Text
1. Voice Calls
2. Video Meetings
3. Email
4. Web Browsing
Show more lines
Voice and video receive higher priority.
Reliability
Service providers often offer:
Redundant paths
Service-level agreements (SLAs)
High availability
MPLS Components
Label Edge Router (LER)
Located at the edge of the MPLS network.
Responsibilities:
Adds labels
Removes labels
Label Switch Router (LSR)
Found inside the MPLS cloud.
Responsibilities:
Reads labels
Forwards packets
Label Switched Path (LSP)
The predetermined path that traffic follows.
Plain Text
Office A
|
LSR
|
LSR
|
Office B
Show more lines
MPLS vs Traditional Internet VPN
MPLS
Plain Text
Private Provider Network
Show more lines
Benefits:
✅ Predictable performance
✅ QoS support
✅ Low latency
✅ High reliability
VPN over Internet
Plain Text
Public Internet
`
Show more lines
Benefits:
✅ Less expensive
✅ Easy to deploy
Disadvantages:
❌ Performance depends on Internet conditions
❌ Less predictable latency
MPLS vs SD-WAN
Modern enterprises are increasingly moving from MPLS to SD-WAN.
Feature MPLS SD-WANPerformance Very High High
Cost Expensive Lower
QoS Excellent Good
Uses Internet No Yes
Flexibility Moderate High
Many organizations now use:
Plain Text
MPLS + SD-WAN
Show more lines
together.
Advantages of MPLS
✅ Fast packet forwarding
✅ Low latency
✅ Excellent QoS
✅ Reliable WAN connectivity
✅ Supports voice and video traffic
✅ Connects multiple branch offices
✅ Very common in enterprise networks
Disadvantages of MPLS
❌ Expensive
❌ Requires a service provider
❌ Less flexible than modern SD-WAN solutions
❌ More complex than Internet-based VPNs
Network+ Exam Tips
Remember
MPLS = Label-Based Forwarding
Instead of using only IP addresses:
Plain Text
Router → Label → Forward
Show more lines
Common Uses
Enterprise WANs
Multi-site businesses
Service provider networks
Voice and video traffic
Key Terms
Term MeaningMPLS Multiprotocol Label Switching
LER Label Edge Router
LSR Label Switch Router
LSP Label Switched Path
QoS Quality of Service
Quick Memory Trick
Plain Text
Traditional Routing = Read IP
MPLS = Read Label
Show more lines
Simple definition: MPLS (Multiprotocol Label Switching) is a WAN technology that improves network performance by attaching labels to packets and forwarding them along predefined paths, enabling fast, reliable communication between branch offices and enterprise networks.
AllPeoplePeopleFilesFilesMeetingsMeetings
 "image title")
Subscribe to our newsletter
Sign up with your email address to receive news and updates.