IAG virtual line

ilham Lv2Posted Feb-23-2026 14:29

Hi,
i want to discuss

we have 200 Mbps for MPLS traffic
we have 170 Mbps for internet traffic

the scenario / the question:

1.) it is possible to configure mpls traffic and internet traffic with 1 virtual lines ?
2.) what happen if configure 2 line, (already configured it and seem network unstable)
3.) how to calculate bandwidth with scenario 1 virtual line

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Muhammad Abid Lv2Posted Feb-24-2026 10:48
  
1) Is it possible to configure MPLS and Internet as one virtual line?

Yes, it is technically possible using SD-WAN or load balancing features. However, it is not recommended to merge them logically if:

MPLS is used for private corporate traffic
Internet is used for public/NAT traffic
They serve different purposes and usually require separate routing policies.

2) What happens if two lines are configured (and network becomes unstable)?

Network instability usually occurs due to:
Incorrect routing (asymmetric routing)
Missing policy-based routing
NAT misconfiguration
Improper load balancing weights
No clear traffic separation

MPLS traffic may accidentally go through the Internet or vice versa, causing packet drops and session instability.

3) How to calculate bandwidth if using one virtual line?

If both links are combined:
Total theoretical bandwidth:
200 Mbps + 170 Mbps = 370 Mbps

However:
A single session can only use one link (max 200 Mbps or 170 Mbps)

Multiple users together can utilize up to 370 Mbps (aggregate)

If using load balancing, bandwidth distribution ratio should be:
MPLS: 200 / 370 ≈ 54%
Internet: 170 / 370 ≈ 46%

Recommended Practice

Keep:

MPLS for corporate/private traffic
Internet for browsing/public traffic

Use policy-based routing or failover instead of merging both into one logical line for better stability and control.


Humayun Ahmed Lv3Posted Feb-23-2026 15:58
  
3) How to calculate bandwidth when using ONE virtual line?

If you insist on 1 virtual line:

Formula:
Virtual Line Bandwidth = MPLS + Internet

So:

200 + 170 = 370 Mbps

Configure:

Outbound bandwidth = 370 Mbps
Inbound bandwidth = 370 Mbps
Humayun Ahmed Lv3Posted Feb-23-2026 15:54
  
MOST COMMON REASON FOR INSTABILITY: MPLS + Internet both bound to same outbound interface, default route conflicts between MPLS & Internet, auto-learning enabled
Humayun Ahmed Lv3Posted Feb-23-2026 15:45
  
2) What happens if configure 2 virtual lines?

Actually THIS is the correct design.

You should have:

Virtual Line 1 → MPLS → 200 Mbps
Virtual Line 2 → Internet → 170 Mbps
Humayun Ahmed Lv3Posted Feb-23-2026 15:42
  
1) Is it possible to configure MPLS + Internet using ONE virtual line?

YES — technically possible
BUT NOT recommended for enterprise production

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