Virtual Leased Lines
Virtual Leased Lines
Please review the following to ensure your Virtual Leased Line (VLL) services are configured appropriately. These services use MPLS-based Virtual Private Wire Service (VPWS), also known as a pseudowire or "martini-style" circuit, which emulates a point-to-point Layer 2 connection over an MPLS network.
To order or manage a VLL, see Virtual Leased Lines (VLLs).
Port Configuration
For your reference, our VLL ports are configured as follows:
| Setting | Configuration |
|---|---|
| MAC layer | IEEE 802.3-2002 |
| UNI MTU | 9100 bytes |
| VLAN EtherType | 0x8100 |
| CoS level | Standard |
| Unicast frame delivery | Deliver unconditionally |
| Multicast frame delivery | Deliver unconditionally |
| Broadcast frame delivery | Deliver unconditionally |
Layer 2 Control Tunnelling
Our VLL ports are configured to discard or tunnel frames with the following protocols:
| Protocol | Action |
|---|---|
| STP, RSTP, MSTP | Tunnel |
| Pause | Discard |
| LACP | Discard |
| Link OAM | Discard |
| 802.1x | Discard |
| E-LMI | Tunnel |
| LLDP | Tunnel |
| GARP | Tunnel |
VLAN Tagging
VLL services are terminated as native (untagged) traffic, or as a VLAN of your choice, except where other services are delivered on the same port.
For example, a typical service port may have peering as untagged and a VLL to another peer as tagged (up to 4096 per port).
Connection Speed
Individual VLL services are limited to a maximum of 10 Gbps, and you may use up to 100% of your port capacity for VLL services. If you require a VLL larger than 10 Gbps, please contact us.
| Port Speed | Available VLL Speed |
|---|---|
| 10/40/100/400 Gbps | Up to 10 Gbps |
Speed Policing
We apply bandwidth policers to all VLL services to ensure we manage growth appropriately and maintain the stability of the IX fabric.
As a general rule, we apply a policing profile of the service speed as CIR + 10% = EBS, and drop any traffic exceeding this. We highly recommend you apply bandwidth shaping profiles to your VLL services at the speed of your service to ensure our policers do not impact them.
| VLL Speed | CIR | EBS | Violation Action |
|---|---|---|---|
| 50 Mbps | 50 Mbps | 55 Mbps | DROP |
| 100 Mbps | 100 Mbps | 110 Mbps | DROP |
| 500 Mbps | 500 Mbps | 550 Mbps | DROP |
| 1 Gbps | 1000 Mbps | 1100 Mbps | DROP |
BFD Timers
To avoid unnecessary link instability (flapping), we strongly recommend configuring your BFD (Bidirectional Forwarding Detection) timers to match ours:
- Multiplier: 3
- TX/RX Interval: 1000ms
If your BFD timers are more aggressive (i.e. set to detect issues in less than 3 x 1000ms), even brief upstream flaps could cause your links to experience unnecessary and excessive instability.