By combining the bandwidth of multiple Internet connections into a single virtual connection, we can provide our customers with fibre speeds at broadband prices.
What is an Aggregator?
Aggregators (also known as aggregation servers) are a key part of the Multapplied SD-Wan architecture. They are effectively a type of router — they route traffic between your core network at on-premises equipment. They are typically integrated into the dynamic routing configuration of your network.
How Does it Work?
Aggregators split customer-bound traffic into multiple streams for each leg of its journey and then recombine traffic from each leg before sending it on to its final Internet destination.
What does that mean for you?
By employing aggregators, Multapplied can combine the speed of bonded connections, even for a single upload or download to provide instant, transparent failover when one leg of your data’s journey goes down.
Link aggregation combines the bandwidth of multiple circuits of any type, including fiber, coax, copper, fixed wireless or LTE, into a single virtual tunnel. Look for SD-WAN vendors who will commit to delivering virtual tunnel with a minimum guarantee of 90% efficiency.
Aggregating multiple circuits from diverse carriers allows Cloud and Managed Service Providers to deliver a virtual connection or multi-site network with dramatically increased uptime and performance. When an SD-WAN platform enables a site to use multiple circuits simultaneously, a single failed or underperforming circuit won’t require manual intervention or involve long delays waiting for backup circuits to activate.
Using multiple circuits from multiple carriers with multiple transmission type can facilitate 99.999% uptime.
Example: With two bonds, each with two 10/10Mbps legs, the aggregator would require 40/40 Mbps bandwidth, assuming no oversubscription. With an oversubscription ratio of 4:1, the aggregator could work with 10/10 Mbps bandwidth.
- Bare metal (strongly recommended), ESX, Xen (PV-GRUB or HVM), or KVM
- See virtualization considerations on provisioning aggregators
- Intel Xeon CPU Ivy Bridge (2013) or newer with at least 4 cores
- AES acceleration instruction set is recommended for faster speeds if encryption is enabled for the tunnel or private WAN
- 2 GB minimum (supports 50 bonds/1 GB memory)
- Add 50 MB for every bond running TCP proxy (when TCP proxy is enabled on at least 1 bond, Aggregator needs more memory and this can vary
- 16 GB minimum
- Ethernet: One-gigabit interface
- IP address: One static public IP
- Internet uplink: Sufficient bandwidth for all bonds assigned to the aggregator, considering your oversubscription ratio (if applicable)
What Does QoS Mean?
Quality of Service (or QoS) refers to a network’s ability to offer an enhanced level of service to specific types of traffic. For example, voice-over-IP traffic is less demanding in terms of latency and jitter than web or email traffic.
This table shows the sensitivity of some commonly used applications to network bandwidth, latency, and jitter.
WebTV / Video
A network with ideal QoS offers each application the appropriate level of service, even when multiple applications are active on the network. Multapplied offer a default pre-installation of bonded internet to ensure end-to-end quality of service, with four available service levels.
(40% of bandwidth)
- ICMP packets up to 500b
- Inter-Asterisk eXchange version 2 traffic
- SIP and H.323 control traffic
- Packets with DSCP expedited forwarding requested
(20% of bandwidth)
- DNS traffic
- Microsoft RDP traffic
- TCP acknowledgments
- SSH traffic
(must be limited to 20 packets per second per connection to avoid classification as interactive)
(20% of bandwidth)
- FTP traffic On ports 20, 21 only (data traffic on other ports will not be matched)
- HTTP/S traffic part of flows greater than 2 MB
(20% of bandwidth)
This is the default class. Packets not matching any filter are classified as routine.
*This profile will classify VoIP traffic correctly on networks using IAX2 or phones that send traffic with the DSCP expedited forwarding class. On other networks, it may be necessary to identify VoIP traffic using source or destination network matching.