5.6. On-Premises Interconnectivity¶
On-Premises Interconnectivity is a service that provides a secure L2 connection between the Server Segment NTT Communications provides and your system environment inside the environment that you operate yourself (called, “On-Premises Environment” below), via the Internet. For On-Premises Interconnectivity, the On-Premises GW is installed in the Data Center and the On-Premises Environment.
- The On-Premises Interconnectivity gateway is constructed of redundant physical devices.
5.6.1. Available Features¶
You can use the following features in On-Premises Interconnectivity.
|Layer 2 (L2) Connection||A feature that connects the Server Segment NTT Communications provides and the On-Premises Environment using the same Server Segment.|
5.6.2. Layer 2 (L2) Connection¶
On-Premises Interconnectivity is composed of the following devices.
|1||On-Premises GW inside the Data Center|
|2||On-Premises GW inside the On-Premises Environment|
|3||Connected network (Internet)|
You can add, change and delete L2 connections between NTT Communications’s Server Segments and On-Premises Environment, within the ranges listed below for one On-Premises Interconnectivity.
|Lower Limit||Upper Limit||Setting Unit|
|Number of L2 connections||1||24||1|
- You can connect to multiple On-Premises Environments at each Data Center.
- The bandwidth that can be used for one On-Premises Interconnectivity is a maximum of 100 Mbps for the total communication going both ways.
- The connection network is provided via the Internet, so quality cannot be guaranteed.
The following shows an example of general On-Premises Environment structure. Here is an explanation of the required conditions for the On-Premises Environment, for connecting between Server Segment and the On-Premises Environment.
- You are responsible for the design and settings of “your own area” within the On-Premises Environment.
On-Premises GW inside the Data Center
- The connection line from the On-Premises GW inside the Data Center to the Internet is provided by dedicated On-Premises Interconnectivity lines. An Internet Connectivity service is not necessary. For details on Internet Connectivity, refer to “5.1.Internet Connectivity”.
Between the devices inside the Data Center and the On-Premises GW inside the On-Premises Environment
- The communication infrastructure that is used for the On-Premises Interconnectivity between the devices inside the Data Center and the On-Premises GW inside the On-Premises Environment is shown below.
- We recommend using a firewall to connect securely to the Internet. You need to set up your own firewalls. Please set allow setting for specific protocol communication in order to implement On-Premises Interconnectivity. For details about the protocol, refer to separate volume “Functional Description (IP Address)”.
On-Premises GW inside the On-Premises Environment
- There must be four Ethernet cables with the same rating of Category 5 (Cat 5) or greater.
- For each On-Premises Interconnectivity, two physical servers are set up which have the virtual appliances provided by NTT Communications (Active Device: one unit and Standby Device: one unit), as On-Premises Connection GW inside the On-Premises Environment.
- The specifications for physical servers for the On-Premises Connection GW inside the On-Premises Environment are shown below. An air-conditioned environment is required to keep the racks and power supplies that can be used under these conditions at a suitable humidity and temperature.
|Height x Width x Depth||8.59 cm × 44.54 cm × 69.98 cm|
|Weight||20.41 kg (minimum) to 27.22 kg (maximum)|
|Number of racks required||19-inch rack, 2U|
|Rack rail requirements||Slide-type universal rack rails with adjustable length (61-91 cm) to fit square hole and round hole cabinets|
|Number of electrical connections||1 (redundancy not possible)|
|Power supply requirements||1,200 W|
|Temperature conditions||10 to 35°C|
|Height conditions||0 to 3,050 m|
|Humidity conditions||10 to 90% and no condensation|
On-Premises GW inside the On-Premises Environment (WAN side)
- It is necessary to have a connection line to the Internet that can be used from the On-Premises Environment.
- There must be two Global IP Addresses (fixed) that can be used for a connection line to the Internet that can be used from the On-Premises Environment.The Global IP Addresses are allocated to the interface for the On-Premises GW inside the On-Premises Environment. They are used for communication with the devices inside NTT Communications’s Data Centers and NTP servers.
On-Premises GW inside the On-Premises Environment (LAN side)
- Please connect the On-Premises GW inside the On-Premises Environment (LAN side) to an L2 switch (trunk link) that uses a tag VLAN that is regulated by IEEE802.1Q.
- The VLAN ID (Identification Number) used must fulfill the following conditions.
|Usable VLAN ID Range||2 to 4,094|
|Number of VLAN IDs required for Server Segment connection||1 to 24|
|VLAN ID (*) used in redundant configuration||1|
|Number of MAC addresses for each connected Server Segment||
The number that can be used differs depending on the prefix length.
* For the redundant VLAN ID, please specify a VLAN ID that is smaller than the number of the VLAN that is used for On-Premises Interconnectivity. For example, if the VLAN ID that is used for the L2 connection inside the On-Premises Environment has the number 500, specify numbers from 499 and below for the redundant VLAN ID.
5.6.3. Important Points¶
- If failures occur, the switchover from the active device to the standby device will be performed automatically. The time taken from when the reason for the switchover occurs to when the switchover is completed is generally just a few seconds. Even when the failure in the active device is solved, it does not switch over to the active device.
- Within the On-Premises Environment, the NTT Communications is only responsible for the On-Premises GW.
- On-Premises GW inside the On-Premises Environment can only be installed (address) inside Japan. They cannot be installed outside of Japan.
- If failures caused by your deliberate act occur to the physical server owned by NTT Communications that features as the On-Premises GW inside the On-Premises Environment, you may be held responsible for restoring it to its original condition.
- You cannot use an NAT feature using a network device for the connection from On-Premises GW inside the On-Premises Environment to the Internet.
- You cannot use one Server Segment for multiple L2 connections.
- You cannot connect multiple VLANs set inside a single On-Premises Environment to the same Server Segment simultaneously.
- To add and use a VLAN ID that is lower than the redundant VLAN ID in the L2 tunnel, you need to change the redundant VLAN ID.
- If different IP address blocks or subnet masks are set for the Server Segments and VLAN inside the On-Premises Environment that connect via L2, NTT Communications assumes no responsibility whatsoever for issues arising from those settings.
- You are responsible for IP address design in the On-Premises Environment and Enterprise Cloud. NTT Communications assumes no responsibility for any failures that may occur due to IP design problems.
- In order to prevent adverse effects on shared equipment, NTT Communications uses settings that partially restrict multicast and broadcast communications.
- If the MAC address of the Virtual Machine of Enterprise Cloud and the MAC address of the devices inside the On-Premises Environment overlap, the Customer might be required to change the MAC addresses. Also, if MAC addresses adversely affect equipment shared with other customers, we might restrict the use of On-Premises connection without prior permission from you.