Symptom
CLI hangs, to get back CLI, either need to power cycle or need to reload the router by telnet to the mgmt ip.
Conditions
1. This happens in 6.2.6 with "system admin-vdc migrate xxx" when user has banner motd configurations with "!" and "#" as delimiter.
2. "#" and "!" work in all other releases except 6.2.8. The following characters are known to cause similar issue:
[ $ ^ . | ? \ >
The following characters works fine
{}]*+<
Workaround
1. Before migrate to admin VDC, it's recommended to remove CLI "banner motd " from the config, or use known working characters like "*", "+", "{" or "}" as delimiter. banner command can be applied after vdc migration.
2. Once CLI hangs, either need to power cycle or need to reload the router by telnet to the mgmt ip. Don't save the configuration before reload.
Further Problem Description
bug CSCur12074 has similar appearance, but happens for other delimiters like "^", "." and "$"
