Re: STP and RSTP congergence time

On 5月9日, 下午3时27分, Albert Manfredi <bert22...@xxxxxxxxxxx> wrote:
On May 9, 4:01 pm, aaabb...@xxxxxxxxxxx wrote:

In my experience, RSTP can be from around 1 second down to less than
50 msec. It all depends on what broke in the network.
Thanks,
The port to change stage is not depends on hello package. right?
For RSTP it has alternate port and backup port. The alternate port
I can think it is blocking port in STP in another switch. How about
buckup
port, does it need to be config manually?

The alternate and/or backup links are computed automatically. To
detect a failed link, you don't use hello packets, but rather the
MAC_Operational parameter, which in turn is set according to each
specific LAN type. The reason failure detection can be so fast is that
in modern LANs, the active or backup/alternate link should never be
quiescent, even when idle, so if an alternate path is available, it
can be activated very quickly.

This is in IEEE 802.1D, Clause 17, which then refers to other clauses
in the same Standard.

Bert

Thanks,
I am trying to understand your "words"
For backup port, assume there are multiple ports on the same segement,
before topology change, Does the backup port automatically random
selected? after the active port down, the backup port immediately
become active port.
I think it shouls impact whole tree.
.

Relevant Pages

  • Re: STP and RSTP congergence time
    ... The port to change stage is not depends on hello package. ... For RSTP it has alternate port and backup port. ... The alternate and/or backup links are computed automatically. ... This is in IEEE 802.1D, Clause 17, which then refers to other clauses ...
    (comp.dcom.lans.ethernet)
  • Sending to multiple alternate ports
    ... different port for each mail domain, ... for mail domain "2525.mydom.com" mail should be delivered on server ... I found a tip in sendmail FAQ 3.39 ... each time a new alternate port is set up on the mailapplications-server, ...
    (comp.mail.sendmail)
  • Re: Trying to set port for Remote Desktop Connection on Win2K3
    ... if you run netstat -an can you see the TCP port 45454 listed? ... First try to connect to the server on LAN with this command (from e.g. ... >3389 on my XP Pro machines, but when I attempt to set an alternate port on ...
    (microsoft.public.windows.server.security)
  • Re: Port 80 Times Out WAN side; works great LAN side; switched ISP
    ... Could it be your ISP is blocking port 80 for incoming traffic? ... All we did was move the server from a static ... Is there a technet article for using alternate port ...
    (microsoft.public.windows.server.networking)
  • external mail submission
    ... I'm trying to set up our corporate e-mail server so that people who ... are on the road (i.e. outside the corporate network) can send mail ... access to port 25. ... as firewall magic to make port an alternate port pass through to ...
    (comp.unix.admin)