Router Memory

Unanswered Question
May 21st, 2008

Hello my friends,

I have a question about Router memory in general.

show memory summary

Head Total(b) Used(b) Free(b) Lowest(b) Largest(b)

Processor 203E77C 1316996 1316180 816 0 116

I/O 2180000 524288 292696 231592 155244 195684

The total memory size is

1316996 + 524288 = 1841284 Bytes

And from the show version

cisco 1601 (68360) processor (revision C) with 1536K/512K bytes of memory.

Processor board ID 10164160, with hardware revision 00000000

Bridging software.

Total from show 1536K + 512K= 2 MB

So, there is a difference between the total memory from the show memory summary and the show version, why that?

Thanks in advance

I have this problem too.
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a.hajhamad Wed, 05/21/2008 - 21:20

Hi,

Thanks.

Look, show memory dead:

===========================================

Router#show memory dead

Head Total(b) Used(b) Free(b) Lowest(b) Largest(b)

Processor 203E77C 1316996 1316232 764 0 128

I/O 2180000 524288 293268 231020 155244 195684

Processor memory

Address Bytes Prev. Next Ref PrevF NextF Alloc PC What

20A4754 32 20A4704 20A47A0 1 814E204 EIGRP IIDB link

20A484C 24 20A47A0 20A4890 1 816FB48 Router Init

20A4890 24 20A484C 20A48D4 1 816FB48 Router Init

20A6CB4 32 20A6C54 20A6D00 1 814E204 EIGRP IIDB link

20A744C 24 20A6F30 20A7490 1 8156220 Dual IIDB scratch table

20A91C8 52 20A900C 20A9228 1 814E204 EIGRP IIDB link

20AAB54 56 20AAAAC 20AABB8 1 8143F98 SMF entry

20DA164 52 20DA11C 20DA1C4 1 816FB48 Router Init

2108034 436 2107FD4 2108214 2 814DF34 EIGRP IIDB

2128D30 52 2128CB4 2128D90 1 83700D0 Router Init

2137E5C 400 21337E0 2138018 395 814DF34 EIGRP IIDB

2138018 400 2137E5C 21381D4 1 814DF34 EIGRP IIDB

217954C 68 217947C 21795BC 1 83700D0 Virtual Exec

------

2224

I/O memory

Address Bytes Prev. Next Ref PrevF NextF Alloc PC What

==================================

The 2224 Bytes is the sum of the memory allocated by dead processes?

which means i need to add this value plus Processor and I/O memory sizes, but this is not the same as real memory size (2 MB)

Many Thanks

dougbruyer Thu, 05/29/2008 - 11:05

The show version will show the total hardware memory installed on the router.

show memory sum "Free(b)" will show the memory installed minus the amount taken by the IOS.

Doug Bruyer

CCIE 18009

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