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Posted by on July 8, 2008, 7:51 am
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> I found some messages on this subject, and search for docs on
> Cisco.com, but to no help at all.
>=20
> I am trying to tftp boot one of those large >32MB enterprise images
> that do not fit in any flash, but without success.
We had/have fun with this issue on 28xx hardware: the regular images are
way over 32MB, yet the ROMMON does not implement the blksize extension...
> Could anyone post the correct step-by-step procedure to configure the
> router to boot such an image from tftp successfully? Could anyone
> indicate which image we need to have in flash in order to have a
> successful tftp boot without running out of memory?
Its mainly a TFTP issue: plain standard TFTP w/o extensions has a protoco=
l
inherent filesize limit of 32MB since the standard block size of TFTP is
512 Bytes and the sequence number field in TFTP is only 16 bits wide
therefore you can only transfer 2^16-2 blocks of 512 bytes each -> roughl=
y
32MB.
There are certain TFTP extensions that help overcome this limit
("blksize"). The only problem is: these are not implemented in ROMMON and
Cisco does not plan to implement it (result of a case we had open with
Cisco), at least not on 28xx hardware.
I think your options are:
- find a tftp server that has no problem transfering files >32MB without
the blksize extension (thereby violating the TFTP protocol)
- Using a boot-helper image
- Use something else than TFTP for transfer (might not work on the 3640)
Ciao Chris
--=20
All diese Momente werden verloren sein in der Zeit, so wie Tr=E4nen im Re=
gen
GPG Fingerprint: 53BF634B 28326F92 79651A15 F84ABB55 4F068E4E
Ich finde, scharfe Waffen und "Feuer nach eigenem Ermessen" sollte zum
Adminjob dazugeh=F6ren. [Lars Marowsky-Bree in d.a.s.r]
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