From af0bcc05a48944dea07a8c944e5709a0d2bbd038 Mon Sep 17 00:00:00 2001 From: chhan11 Date: Mon, 29 May 2017 09:13:24 +0200 Subject: [PATCH] chapter/section/spanningtree.tex: Updated flexlinks --- chapter/section/spanningtree.tex | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/chapter/section/spanningtree.tex b/chapter/section/spanningtree.tex index 0ab1cd6..4cfa98c 100644 --- a/chapter/section/spanningtree.tex +++ b/chapter/section/spanningtree.tex @@ -284,7 +284,15 @@ Cisco did on their part early on enhance the original spanning tree standard wit \item Configured with 2 physical links with and active/backup configuration. \item Enables convergence time of less than 50 milliseconds. \end{itemize} - \item FlexLinks is good alternative to running STP in an environment with customers who you do \texit{not} want to run STP with. Fx. Service Provider/Enterprise/Datacenter environment. + \item FlexLinks is good alternative to running STP in an environment with customers who you do \textit{not} want to run STP with. Fx. Service Provider/Enterprise/Datacenter environment. + \item Preemtion for FlexLinks is \textit{not} enabled-by-default. + \begin{enumerate} + \item Detects link failure. + \item Moves any dynamic unicast MAC addresses learned on primary link to standby link. + \item Moves standby link to forwarding state. + \item Transmits dummy multicast packets over new active interface. {\small Dummy multicast packet format is as follows: \textbf{destination:} 01:00:0c:cd:cd:cd, \textbf{source:} MAC address of the hosts or ports on the newly active FlexLinks port} + \end{enumerate} + \item {\small \textbf{Note:}} Configuring FlexLinks outside of access layer switches can be very complex! \end{itemize} \end{itemize}