Bon problème résolu !!!
Pour ceux que cela pourrait intéresser, je mets les commandes à taper.
En faite la run était trop grosse pour loger dans la start, et à partir des IOS 12.1 (si je ne me trompe pas) il existe ça (je vous le mets telle que je l'ai trouvé :
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Core Issue
The problem occurs when issuing a write memory or copy running-config startup-config command. Compressing the configuration may resolve this issue.
Resolution
To resolve this problem, issue theservice compress-config global configuration command in conjunction with the boot buffersize command.
The service compress-config command causes the configuration to be saved in a compressed form in NVRAM. When the router loads, the configuration is decompressed into RAM.
To adjust the size of the buffer allocated for the running configuration in RAM, issue the boot buffersize command. By default, the buffer size is the size of NVRAM. For example, if a router's NVRAM size is 32 k (sh flash:) , but the running configuration is 40 k before it is compressed to fit in NVRAM, the buffer size should be increased to at least 40 k. The command is boot buffersize 40000. This value may be larger to accomodate additions to the configuration.
Note: The boot buffersize command is only needed in Cisco IOS software versions 12.0 and earlier ( sh version ). From Cisco IOS ver 12.1 the command - service compress-config will solve the NVRAM size issue and the user is not required to configure the command boot buffersize.
This is an example of the service compress-config and boot buffersize commands, where the buffer size is increased to 64,000 bytes. The buffer size changes at the next reload:
Donc les commandes donne sur un routeur :
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<routeur> en
routeur# conf t
routeur(config) service compress-config
routeur(config) boot buffersize 64000
routeur(config) exit
routeur# write memory
Building configuration...
Compressed configuration from 2872 bytes to 1131 bytes[OK]
(pour être sur on fait un)
routeur# copy run start
Voilà
@+++Tard
Edit : Je ne peut pas éditer mon premier post pour mettre le sujet en RESOLU, mais il l'est !