RSTP(Rapid Spanning Tree) is configured on a bridge. All ports of this bridge are “trunk” ports and are part of vlan “x”. Will the BPDUs sent out of this bridge be tagged? Answer No. RSTP BPDUs are never tagged irrespective of the port type(access/trunk). Because RSTP BPDUs on being received by a bridge are sent … Read more
I’m getting notifications on my Syslog server from the Netgear switches GS748Tv4 and v5. These are the notifications: traputil.c(696) 122305 %% Link Down: g30 traputil.c(696) 122323 %% Link Up: g30 traputil.c(739) 122307 %% Spanning Tree Topology Change: 0, Unit: 1 traputil.c(739) 122308 %% Spanning Tree Topology Change Initiated: 0, Interface: g30 Not only for the … Read more
I have a configuration with two switches connected via a single Ethernet port. A second port of the first switch is looped back (Tx connected to Rx). They have 10 MSTI configured on VLAN from 100 to 1000 with step 100. These VLAN are configured on both the ports in the first switch and on … Read more
We have 3 switches – a Core Switch, and 2 downstream switches. Each downstream switch has a 3 cable Trunk direct to the core switch. However – when we disconnected one cable in that trunk group (still leaving 2 physical links in that trunk group online) we lost all connectivity from that switch to the … Read more
Greets long story short we had a power outage here and when the network came back online it would crash out to a flood of ARP requests. This would lead to packet storm/network loop, but after careful auditing there appears no looping. I put an older 10/100 managed switch in instead of the gigabit switch … Read more
So basicly I have a setup which I want to get to work but i’m unable to. It’s possible I am overseeing a lot of things but let’s get to it anyways. The current situation is a network with 4 switches connected to each other (almost a full mesh, 1 link is missing intentionally). I … Read more
I’m looking to create a test environment for STP / RSTP. I eventually came by this post that suggested using namespaces. It seemed like that was exactly what I’d wanted to create the simplest STP environment. I ended up writing a script like this: #!/bin/bash if [ “$EUID” -ne 0 ] then echo “Please run … Read more
Need advice for the bridge tap interface to run stp traffic. created the tap interface and bridge Have come across stp BPDU is consumed by bridge. i’m running the scapy on the host, however i’m not seeing the stp BPDU on the bridge nor on the tapB interface when i run the tcppdump, please advise4. My intent … Read more
how can i completely disable STP in a Opensolaris bridge. This bridge is connected to a Cisco Access Port and will disable the uplink port when the first BPDU arrives. bridged[3651]: [ID 581644 daemon.warning] unexpected BPDU on rge1 from 0:xx:xx:xx:xx:b; forwarding disabled I already disabled the transmission of BPDU Messages to the Switch by: dladm … Read more
I have two machines, A and B, connected via switch S1(master) and s2(slave). I want to measure latency and identify packet flow path from machine A to Switch,switch to machine B. If the link between s1 and A gets failed then packet will flow via s2 and A link. How to find a packet flow … Read more
