11-13-2006 08:24 AM - edited 03-05-2019 12:47 PM
Hi,
The IEEE recommendation is to consider a maximum diameter of seven bridges for the default STP timers, but does someone knows what is the diameter limit for RSTP ? What should we expect from a RSTP loop with a diameter more than 7 hops ? I am asking this because I have seen networks running RSTP with diameter >= 9 bridges causing not any problems.
Thks
11-13-2006 08:40 AM
Hi Kian,
AFAIK the recommended network diameter of a RSTP network (802.1w) is still 7 per the specification.
HTH
Ankur
11-13-2006 12:36 PM
There is no problem going beyond 7. Even for STP, 7 was extremely conservative considering current hw. RSTP more or less use the age as a hop count. You can expect the age to be incremented by one at each hop and your BPDU is going to be aged out when it reaches 20. If you don't like that, you can still increase the max-age because it will have no impact on convergence time with RSTP.
Regards,
Francois
07-23-2021 11:05 PM
I have seen 40 mentioned as the max for RSTP in several papers
07-24-2021 12:39 AM
Hello
Having a stp diameter of 7 hops is a recommended limitation, as you said you have a larger switch hop to the stp root which will mean the stp convergence times be a little higher, as you increase/decrease the stp diameter the stp max age/forward delay changes to accommodate these changes which either speeds up and slows down convergence
sh spanning-tree vlan x | in Hello
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: