Mailing List Archive: Cisco: NSP

3550, 3750, ME3400 storage of current sdm template and system mtu

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bergonz at labs

Jun 14, 2012, 1:20 AM

Post #1 of 3 (404 views)
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3550, 3750, ME3400 storage of current sdm template and system mtu

Anybody knows where does a 3550, 3750 or 3400 store the information about:

- sdm template at next boot
- system mtu (inc. jumbo and routing) at next boot

I ask because I just realized that backing up image, startup-config and
letting rancid do its work are not enough to completely restore a switch
in case of hardware failure. I did some "sh boot", "more" on files I
found in the flash and nvram, but I cannot find this info. Maybe it is
in the private-config.text, which is unreadable (why?).

I am going to add "sh sdm prefer" and "sh system mtu" to rancid, but I
wonder why didn't they simply include it in the config and save me some
troubleshooting.

If you know more configuration parameters that are not stored in the
config, or you know the logic behind this, please let me know.

Regards,
Bergonz

--
Ing. Michele Bergonzoni - Laboratori Guglielmo Marconi S.p.a.
Phone:+39-051-6781926 e-mail: bergonz [at] labs
alt.advanced.networks.design.configure.operate

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peter at rathlev

Jun 14, 2012, 7:03 AM

Post #2 of 3 (376 views)
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Re: 3550, 3750, ME3400 storage of current sdm template and system mtu [In reply to]

On Thu, 2012-06-14 at 10:20 +0200, Michele Bergonzoni wrote:
> Anybody knows where does a 3550, 3750 or 3400 store the information about:
>
> - sdm template at next boot
> - system mtu (inc. jumbo and routing) at next boot

Probably in some boot-related NVRAM. A "show boot" does not tell, so
"show sdm prefer" and "show system mtu" are needed AFAIK.

> If you know more configuration parameters that are not stored in the
> config, or you know the logic behind this, please let me know.

SNMPv3 users, "show snmp user". These are stored in private-config.text,
which cannot be read for security reasons of some kind.

The VLAN database if you're not using "transparent" or "off" VTP modes.
It's stored in vlan.dat. Make sure to delete this before applying
configuration to the replacement, since VLANs from an existing vlan.dat
are inherited even with "vtp mode transparent".

I don't know anything about ME3400, but the above is relevant for at
least the 3550, 3560 and 3750 switches.

--
Peter

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matt.addison at lists

Jun 15, 2012, 2:42 PM

Post #3 of 3 (362 views)
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Re: 3550, 3750, ME3400 storage of current sdm template and system mtu [In reply to]

flash:/env_vars

Afaik private-config is only for private key storage.

Sent from my iPad

On Jun 14, 2012, at 4:57, Michele Bergonzoni <bergonz [at] labs> wrote:

> Anybody knows where does a 3550, 3750 or 3400 store the information about:
>
> - sdm template at next boot
> - system mtu (inc. jumbo and routing) at next boot
>
> I ask because I just realized that backing up image, startup-config and letting rancid do its work are not enough to completely restore a switch in case of hardware failure. I did some "sh boot", "more" on files I found in the flash and nvram, but I cannot find this info. Maybe it is in the private-config.text, which is unreadable (why?).
>
> I am going to add "sh sdm prefer" and "sh system mtu" to rancid, but I wonder why didn't they simply include it in the config and save me some troubleshooting.
>
> If you know more configuration parameters that are not stored in the config, or you know the logic behind this, please let me know.
>
> Regards,
> Bergonz
>
>
> --
> Ing. Michele Bergonzoni - Laboratori Guglielmo Marconi S.p.a.
> Phone:+39-051-6781926 e-mail: bergonz [at] labs
> alt.advanced.networks.design.configure.operate
>
> _______________________________________________
> cisco-nsp mailing list cisco-nsp [at] puck
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/

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