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#You need to configure spanning tree on a cisco switch macTo select a root bridge, the Bridge ID (which contains the bridge priority and MAC address) is examined. One bridge on your network is selected as the root bridge. The bridges in your network send BPDUs to each other to: When you enable Spanning Tree Protocol, the topology convergence selection process automatically occurs. You can change the hello value from the Fireware CLI. For the Firebox, the default interval is 2 seconds. Configuration - Sent by a root bridge to the entire network at an interval specified by the hello value.After the non-root switch receives the TCA, it no longer broadcasts the TCN. Topology Change Acknowledgment (TCA ) - Sent by the root bridge to the non-root bridge that reported a topology change.Topology Change Notification (TCN) - Sent by a non-root bridge to the root bridge to announce a topology change.Switches configured for Spanning Tree Protocol send three kinds of BPDUs on your network: The smaller the port ID, the higher the priority. The port ID contains the bridge priority and the interface identifier. ![]() This list shows the path costs specified by IEEE 802.1D. If the link speed or duplex settings of a port changes, Spanning Tree Protocol automatically recalculates the path cost. Path cost is a value associated with the link speed (bandwidth) of the links between bridges. The smaller the bridge priority number, the higher the priority. It contains the bridge priority and the MAC address of the bridge. A BPDU is a small packet that specifies the Bridge ID, Path cost, Port ID, and other information.Ī Bridge ID (BID) is an identifier used to select the root bridge. To communicate with each other, root and non-root bridges send Bridge Protocol Data Units (BPDUs) on the network. This diagram shows a simple implementation of Spanning Tree with the Firebox as the root bridge: For more information about link failover, see the Topology Changes and Link Failover section. If an active link becomes unavailable, network communication automatically fails over to a redundant link. If more than one path to a location exists, the Spanning Tree Algorithm calculates the best path, and blocks redundant links so they cannot forward packets. The root bridge manages your redundant links to make sure that there is only one active path to each location on your network. The other switches in your network, non-root bridges, are located along the tree branches. A root bridge switch is located at the bottom of the tree. In a Spanning Tree implementation, your network topology has a tree structure. Because Spanning Tree Protocol operates on Layer 2 of your network, you can enable this feature without any impact to Firebox performance. Spanning Tree Protocol runs on switches and bridges on a LAN. ![]() For more information about the default Spanning Tree Protocol settings, see Configure Spanning Tree Protocol Settings in the CLI. You can only change the default Spanning Tree Protocol settings from the Fireware Command Line Interface (CLI). #You need to configure spanning tree on a cisco switch how toFor information about how to configure a switch for Spanning Tree Protocol, see the documentation for your switch. For detailed technical information about Spanning Tree Protocol, see IEEE 802.1D. This topic includes basic information about Spanning Tree Protocol. Multiple Spanning Tree Protocol (MSTP) and proprietary STP protocols are not supported. To work with the Firebox, switches with Rapid Spanning Tree Protocol (RSTP) must be backward compatible with STP. Spanning Tree Protocol is not supported for FireCluster. A single tagged VLAN between a Firebox and a third-party switch.Multiple tagged or untagged VLANs between a Firebox and a third-party switch.Multiple tagged or untagged VLANs between Fireboxes.Single untagged VLAN between a Firebox and a third-party switch.Spanning Tree Protocol support for VLANs includes: You can enable Spanning Tree Protocol for:įor information about how to enable Spanning Tree Protocol for a network bridge, see Create a Network Bridge Configuration.įor information about how to enable Spanning Tree Protocol for a Firebox configured in Bridge mode, see Bridge Mode.įor information about how to enable Spanning Tree Protocol for a VLAN, see Define a New VLAN. To avoid loops, you can enable Spanning Tree Protocol (STP), a network protocol designed to avoid loops on networks configured with redundant links. However, if not implemented correctly, redundant links can cause network loops that disrupt communication. Administrators who must configure a highly-available network can set up redundant links between switches to avoid network downtime. ![]()
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