Cisco 2525 Betriebsanweisung PDF herunterladen (Seite 120)

A-8 Cisco 2524 and Cisco 2525 Router User Guide

Upgrading the DRAM SIMM

Cisco IOS feature set requires a DRAM conﬁguration other than 4, 8, or 16 MB, your router

will have a combination of ﬁxed DRAM and a DRAM SIMM. For example, if the

Cisco IOS feature set originally ordered with your router requires 6-MB DRAM, your

router will include 2-MB ﬁxed DRAM and a 4-MB DRAM SIMM for a total of 6-MB

DRAM (because a 6-MB DRAM SIMM is not available).

The system allocates the total memory installed on the ﬁxed DRAM or the DRAM SIMM

as primary and shared memory. Primary memory is used to store the operating

conﬁguration, routing tables, caches, queues, and packets. Shared memory is used to store

incoming and outgoing packets.

Table A-1 describes the relationship between the physical conﬁguration of DRAM (that is,

ﬁxed DRAM and which size DRAM SIMM are needed to obtain from 2- to 18-MB of total

DRAM) and how the system allocates the DRAM as shared and primary DRAM.

Table A-1 DRAM Physical Conﬁguration and System Allocation

To see how much memory is currently installed in the router, enter the show version

command. Near the middle of the resulting output, a message similar to the following

displays:

Cisco XXXX(68030) processor (revision X) with 4092K/2048K bytes of memory.

Physical Conﬁguration System Allocation

Total DRAM

(MB)

Fixed DRAM

(MB)

DRAM SIMM

(MB)

Shared DRAM

(MB)

Primary DRAM

(MB)

22 – 1 1

4– 4 2 2

62 4 2 4

8– 8 2 6

10 2 8 2 8

16 – 16 2 14

18 2 16 2 16

1 2 ... 115 116 117 118 119 120 121 122 123 124 125 ... 165 166

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Cisco 2525 Betriebsanweisung Seite 120