Could you explain bridge_opts's parameter at custom properties of logical network ?

Issue

• Could you explain bridge_opts's parameter at custom properties of logical network ?

forward_delay=xxx
gc_timer=xxxx
group_addr=xx:xx:xx:xx:xx:xx
group_fwd_mask=0x0 
hash_elasticity=4 
hash_max=512
hello_time=200 
hello_timer=70 
max_age=2000 
multicast_last_member_count=2 
multicast_last_member_interval=100 
multicast_membership_interval=26000 
multicast_querier=0 
multicast_querier_interval=25500 
multicast_query_interval=13000 
multicast_query_response_interval=1000 
multicast_query_use_ifaddr=0 
multicast_router=1 
multicast_snooping=1 
multicast_startup_query_count=2 
multicast_startup_query_interval=3125