Hello Folks, You can do this with "Fast Span" or "Fast Uplink Span". Although it won't display in the running config, this is already enabled by default
Here's the details from our manual: ---------------------------------------------------------------------------------------------------------------------- Fast Port Span When STP is running on a device, message forwarding is delayed during the spanning tree recalculation period following a topology change. The STP forward delay parameter specifies the period of time a bridge waits before forwarding data packets. The forward delay controls the listening and learning periods of STP reconvergence. You can configure the forward delay to a value from 4-30 seconds. The default is 15 seconds. Thus, using the standard forward delay, convergence requires 30 seconds (15 seconds for listening and an additional 15 seconds for learning) when the default value is used. This slow convergence is undesirable and unnecessary in some circumstances. The Fast Port Span feature allows certain ports to enter the forwarding state in four seconds. Specifically, Fast Port Span allows faster convergence on ports that are attached to end stations and thus do not present the potential to cause Layer 2 forwarding loops. Because the end stations cannot cause forwarding loops, they can safely go through the STP state changes (blocking to listening to learning to forwarding) more quickly than is allowed by the standard STP convergence time. Fast Port Span performs the convergence on these ports in four seconds (two seconds for listening and two seconds for learning). In addition, Fast Port Span enhances overall network performance in the following ways: . Fast Port Span reduces the number of STP topology change notifications on the network. When an end station attached to a Fast Span port comes up or down, the Brocade device does not generate a topology change notification for the port. In this situation, the notification is unnecessary since a change in the state of the host does not affect the network topology. . Fast Port Span eliminates unnecessary MAC cache aging that can be caused by topology change notifications. Bridging devices age out the learned MAC addresses in their MAC caches if the addresses are unrefreshed for a given period of time, sometimes called the MAC aging interval. When STP sends a topology change notification, devices that receive the notification use the value of the STP forward delay to quickly age out their MAC caches. For example, if a device normal MAC aging interval is 5 minutes, the aging interval changes temporarily to the value of the forward delay (for example, 15 seconds) in response to an STP topology change. In normal STP, the accelerated cache aging occurs even when a single host goes up or down. Because Fast Port Span does not send a topology change notification when a host on a Fast Port Span port goes up or down, the unnecessary cache aging that can occur in these circumstances under normal STP is eliminated. Fast Port Span is a system-wide parameter and is enabled by default. Thus, when you boot a device, all the ports that are attached only to end stations run Fast Port Span. For ports that are not eligible for Fast Port Span, such as ports connected to other networking devices, the device automatically uses the normal STP settings. If a port matches any of the following criteria, the port is ineligible for Fast Port Span and uses normal STP instead: . The port is 802.1Q tagged . The port is a member of a trunk group . The port has learned more than one active MAC address . An STP Configuration BPDU has been received on the port, thus indicating the presence of another bridge on the port. You also can explicitly exclude individual ports from Fast Port Span if needed. For example, if the only uplink ports for a wiring closet switch are Gbps ports, you can exclude the ports from Fast Port Span. Disabling and re-enabling Fast Port Span Fast Port Span is a system-wide parameter and is enabled by default. Therefore, all ports that are eligible for Fast Port Span use it. To disable or re-enable Fast Port Span, enter the following commands. Brocade(config)# no fast port-span Brocade(config)# write memory To re-enable Fast Port Span, enter the following commands. Brocade(config)# fast port-span Brocade(config)# write memory ---------------------------------------------------------------------------------------------- Fast Uplink Span The Fast Port Span feature described in the previous section enhances STP performance for end stations. The Fast Uplink Span feature enhances STP performance for wiring closet switches with redundant uplinks. Using the default value for the standard STP forward delay, convergence following a transition from an active link to a redundant link can take 30 seconds (15 seconds for listening and an additional 15 seconds for learning). You can use the Fast Uplink Span feature on a Brocade device deployed as a wiring closet switch to decrease the convergence time for the uplink ports to another device to just one second. The new Uplink port directly goes to forward mode (bypassing listening and learning modes). The wiring closet switch must be a Brocade device but the device at the other end of the link can be a Brocade device or another vendor's switch. Configuration of the Fast Uplink Span feature takes place entirely on the Brocade device. To configure the Fast Uplink Span feature, specify a group of ports that have redundant uplinks on the wiring closet switch (Brocade device). If the active link becomes unavailable, the Fast Uplink Span feature transitions the forwarding to one of the other redundant uplink ports in just one second. All Fast Uplink Span-enabled ports are members of a single Fast Uplink Span group. NOTE To avoid the potential for temporary bridging loops, Brocade recommends that you use the Fast Uplink feature only for wiring closet switches (switches at the edge of the network cloud). In addition, enable the feature only on a group of ports intended for redundancy, so that at any given time only one of the ports is expected to be in the forwarding state. NOTE When the wiring closet switch (Brocade device) first comes up or when STP is first enabled, the uplink ports still must go through the standard STP state transition without any acceleration. This behavior guards against temporary routing loops as the switch tries to determine the states for all the ports. Fast Uplink Span acceleration applies only when a working uplink becomes unavailable. Active uplink port failure The active uplink port is the port elected as the root port using the standard STP rules. All other ports in the group are redundant uplink ports. If an active uplink port becomes unavailable, Fast Uplink Span transitions the forwarding of traffic to one of the redundant ports in the Fast Uplink Span group in one second bypassing listening and learning port states. Switchover to the active uplink port When a failed active uplink port becomes available again, switchover from the redundant port to the active uplink port is delayed by 30 seconds. The delay allows the remote port to transition to forwarding mode using the standard STP rules. After 30 seconds, the blocked active uplink port begins forwarding in just one second and the redundant port is blocked. NOTE Use caution when changing the spanning tree priority. If the switch becomes the root bridge, Fast Uplink Span will be disabled automatically. Configuring a Fast Uplink port group To configure a group of ports for Fast Uplink Span, enter the following commands: Brocade(config)# fast uplink-span ethernet 1/2/1 to 1/2/4 Brocade(config)# write memory ---------------------------------------------------------------------------------------------------------------- -----Original Message----- From: foundry-nsp [mailto:[email protected]] On Behalf Of "Rolf Hanßen" Sent: Monday, June 16, 2014 12:20 AM To: [email protected] Cc: [email protected] Subject: Re: [f-nsp] Cisco equivalent of 'portfast' on FCX? Hi, btw, there is a "no spanning-tree", but you need to configure it per vlan. SSH@xxx(config)# vlan 3000 SSH@xxx(config-vlan-3000)#no sp spanning-tree Set spanning tree for this VLAN SSH@xxx(config-vlan-3000)#no spanning-tree kind regards Rolf > Nothing jumping out at me: > > #spanning-tree ? > 802-1w Disable or enable IEEE 802.1W parameters > designated-protect Declare the port to be on Designated guard for > all > spanning trees > root-protect Declare the port to be on Root guard for all > spanning > trees > <cr> > > I'm guessing something like: > > #no spanning-tree > #stp-bdpu-guard > > Any clues? > > -- > Randy M. > > _______________________________________________ > foundry-nsp mailing list > [email protected] > http://puck.nether.net/mailman/listinfo/foundry-nsp > _______________________________________________ foundry-nsp mailing list [email protected] http://puck.nether.net/mailman/listinfo/foundry-nsp _______________________________________________ foundry-nsp mailing list [email protected] http://puck.nether.net/mailman/listinfo/foundry-nsp
