We are trying to change the snmp community string on a Catalyst 1912. The old string was a mix of letters and numbers and the new string will be as well (and the same length). However when we try and change it we get an error message saying ambiguous string. The switch will only accept a string of all letters. We can't even re-apply the last string that's been working for a couple of years. Anyone any ideas? I can't find any other reports of this on the website. Firmware version is V9.00.06
Thanks in advance,
The reason this happens is because of a bug fix that went into 9.00.05. The problem was that the 1900/2820 switches do not do community string indexing like other Cisco switches. They acknowledged a string that ends in number to be string+vlan where vlan is the number component.
The bug, CSCdv35159, was fixed such that strings that end in any combination of numbers and '@' will be disallowed. You will need to pick a string that ends with letters. The string should not contain a '@' and numbers are valid only within the string (not at the end).