Section 8.10.2 of IEEE 802.1D specifies the maximum diameter (The maximum bridge diameter of the Bridge LAN: The maximum number of Bridges between
any two points of attachment of end stations) as 7.
This is not, however, a set limit, it is a guidline derived when bridges were software devices and was based on the delay in transmitting BPDU's. In a modern switched environmnent it should be safe to go above this limit.
If, however, you wish to be in line with the IEEE standards you should conform to this.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...