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The ESG, unlike the DLR, does not run in Kernel space; it is a virtual machine that comes in four different form factors. These form factors are:
Form factor size |
Memory |
vCPU |
Disk space |
Compact |
512 MB |
1 |
1 disk = 584 MB + 1 disk = 512 MB |
Large |
1 GB |
2 |
1 disk = 584 MB + 1 disk = 512 MB |
Quad Large |
2 GB |
4 |
1 disk = 584 MB + 1 disk = 512 MB |
X-Large |
8 GB |
6 |
1 disk = 584 MB + 1 disk = 2 GB + 1 disk 256 MB |
Typically, all ESGs designated solely for routing should be chosen with the large form factor for production roll-outs; the compact form factor should be reserved for proof of concept environments. Larger form factors should be used if other ESG functions will be used in addition to routing.
Similar to the DLR, there are two distinct interface types for the ESG; internal and uplink. Each ESG can have a total of ten internal and uplink interfaces configured. The differences between the two types of interfaces are as follows:
- Internal: The internal interface is reserved for secured Portgroups and can act as the gateway for virtual machines.
- Uplink: The uplink interface is intended for shared network interfaces, such as those connecting to a VLAN-backed Portgroup for north-south connectivity. However, compared to the internal interface, the following services are not supported on an uplink interface:
- DHCP
- DNS Forwarder
- HA
But the following services are supported:
-
- SSL VPN Listener IP Address
- IPsec VPN Listener IP Address
In addition to deploying the ESG, we also selected HA. HA is provided in an Active/Standby mode and with a default HA timer set to 15 seconds. This timer can be tuned down to six seconds if a faster fail over time is required.