64MB RAM
32MB (fixed size)
20MB
8-12MB
(fixed size)
| 64MB RAM | |
| 64MB RAM | |
- System software | 64MB RAM | |
- Config files | ||
| ||
- Gated binary |
| |
- Route table |
| |
- Kernel runs |
| |
- Gated runs | = expandable area of RAM |
Figure 18. System RAM
2.3.5 Characteristics of GRF Media Cards
All GRF media cards (media adapters) are
Each media card has an onboard processor that is responsible for IP forwarding on the media adapter.
Each media card has two independent memory buffers, a 4 MB send buffer and a 4 MB receive buffer. These buffers are necessary to balance the speed differences between the media adapters, because they have different transfer rates.
Each onboard processor has local memory that can contain a local route table with up to 150,000 entries, to be used for routing on the media adapter. Because these route entries are in local memory, access to them is very fast. When the media adapter is started up, it gets its initial route entries from the IP Switch Control Board.
2.3.6 SP Switch Router Adapter
The GRF supports a number of media adapters. Figure 19 describes the SP Switch Router Adapter in detail. This adapter allows the GRF to connect directly into the SP Switch.
