Q. How do you filter BPDUs on SSR ports where STP is not enabled?
A. Use stp filter-bpdu

Q. How do you upgrade SSRs with 2 Control Modules to E9.1.9.1 code?
A. Use the below procedure:
-- system promimage upgrade {IP of TFTP server} p3300mod (for SSR8x00, use p3300fix for SSR2000)
-- system promimage upgrade {IP of TFTP server} p3300mod backup-cm
-- system image choose none
-- system image delete xp9100
-- y (to primary-cm)
-- y (to secondary-cm)
-- system image add {IP of TFTP server} xp9191
-- system image choose xp9191
-- system image list all (to check the configuration is correct)
-- reboot