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Router Node 35
Additionally, the RS232 port (which is not shown in the figure) allows you to
connect the VT100 console by using an RS232 null modem cable. The
console and cable must be supplied by the user.
2.3.4 Memory Guidelines for the IP Switch Control Board
As already mentioned, the GRF base system comes with 128 MB of memory.
In all GRF memory configurations, 32 MB are used for the file system and the
remainder is used for system operations. For example, in the base system,
there are 128 MB of total memory, 32 MB of available memory and 78 MB of
usable memory. (Refer to Table 1 on page 35 for detailed memory
configuration information). Up to six additional 32 MB DRAM SIMMS may be
added to support larger dynamic routing tables and larger numbers of peers
(for a total of 256 MB, 204 MB usable).
The following table provides guidelines for memory configuration. All media
cards can hold up to 150 KB route entries. The control board, depending on
memory configuration, can hold 35,805 to 521,730 route prefixes. Select the
amount of memory according to your routing environment. Additional memory
may be required for higher average numbers of routes per BGP peer.
Table 1. Memory Configuration
Figure 18 gives an overview of the memory layout and the possible memory
extensions.
Customer
Profile
Total
Mem.
Avail. Usable No. of
Route
Entries
on
Media
Cards
No. of
Route
Prefixes
in
Dynamic
Database
No. of
Peer
Sess.
Static Routing 64 MB 32 MB 14 MB 150 KB 35805 0
Small POP 128 MB 96 MB 78 MB 150 KB 199485 3
Medium POP/
ISP Backbone
192 MB 160 MB 142 MB 150 KB 362165 7
Large POP/
Exchange Point/
Route Reflection
Server
256 MB 224 MB 204 MB 150 KB 521730 10