RE: Monitoring Memory Utilization(%) on a router.

From: simonkc@netsol.co.in
Date: Wed Feb 12 2003 - 02:20:40 GMT-3

Thanks Herve. That makes it clear....but how do i get the total amount of
DRAM installed in the router via SNMP?? Which MIB and OID?

Thanks

Simon

-----Original Message-----
From: Herve Bruyere [mailto:hbruyere@cisco.com]
Sent: Tuesday, February 11, 2003 4:48 PM
To: simonkc@netsol.co.in
Cc: ccielab@groupstudy.com
Subject: Re: Monitoring Memory Utilization(%) on a router.

simonkc@netsol.co.in wrote:
> Hi,
>
> 1) i do a "show memory" on a cisco 26xx router. It shows me the Total
> Processor Memory and Total IO memory.
> When i add up these 2 values, why is it not equal to total amount of DRAM
in
> your router (as shown by sh ver)???

Simply because Processor + I/O mem is not equal total DRAM.

The IOS loaded in RAM and additional datas need also some space:

muuma#sh ver | i with
cisco 2611 (MPC860) processor (revision 0x202) with 28672K/4096K bytes of
memory.

muuma#sh mem
                Head Total(b) Used(b) Free(b) Lowest(b) Largest(b)
Processor 80B7D5D0 17312304 2375180 14937124 14745720 14822080
       I/O 1C00000 4194304 1709592 2484712 2484712 2484668

Below you can see that the total main memory + I/O fits the physical 32
megs:

muuma#sh region
Region Manager:

       Start End Size(b) Class Media Name
  0x01C00000 0x01FFFFFF 4194304 Iomem R/W iomem
  0x60000000 0x60FFFFFF 16777216 Flash R/O flash
  0x80000000 0x81BFFFFF 29360128 Local R/W main
  0x80008088 0x807C18AB 8099876 IText R/O main:text
  0x807C18AC 0x80A78F27 2848380 IData R/W main:data
  0x80A78F28 0x80B7D5CF 1066664 IBss R/W main:bss
  0x80B7D5D0 0x81BFFFFF 17312304 Local R/W main:heap

Regards,
Herve

>
> 2)Assuming the "sh memory" output does not give us the correct picture
about
> memory utilization, which MIBs and objects should we monitor to get the
> memory utilization( as a %)of the router?
> Or can we atleast get the "free memory" , "used memory" or "total memory"
> via SNMP and using MIB expressions, we can compute the Memory utilization
as
> a %??What are the MIBs and objects to get this info?
>
> Cheers
> Simon
> .
.

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