There were disruptions in news coverage on television and radio as BBC journalists took part in a 24-hour strike on Friday.
Members of the National Union of Journalists (NUJ) voted to go on strike over compulsory redundancies, which would affect people working in the World Service and BBC Monitoring.
"They've stolen our pensions, they're not giving us pay rises and now they're trying to make people redundant against their will. Industrial relations at the BBC have rarely been worse," the CBC quoted NUJ representative Pierre Vicary as saying.
The corporation argues that "a number of potential compulsory redundancies" are necessary because of cuts in government grants that support the World Service and BBC Monitoring, but the union feels other steps should be taken.
""The BBC's rejection of our offer to go to Acas (the conciliation service) has really angered our members," Sky News quoted NUJ general secretary Michelle Stanistreet as saying.
"There are so many people who want to leave the BBC that this could be resolved through negotiations.
"Jobs are being saved and created at management level, but journalists are losing theirs."
People showed up at picket lines at BBC locations across the country from midnight on Thursday.
"Management have acted with indecent haste, haven't followed proper procedures, they've got rid of someone in the World Service even though there were redeployment opportunities," the BBC quoted NUJ spokesman Martin Huws as saying.
A BBC spokesman apologised for disruptions to services, but said that there are more than 100 BBC posts for which compulsory redundancy is unavoidable.
Another 24-hour strike is planned for July 29.