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... Features 14-11 Default Spanning-Tree Configuration 14-11 Spanning-Tree Configuration Guidelines 14-12 Changing the Spanning-Tree Mode 14-13 Disabling Spanning Tree 14-14 Configuring the Root Switch 14-14 Configuring a Secondary Root Switch 14-16 Configuring the Port Priority 14-17 Configuring the Path Cost 14-19 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide xiii
... Features 14-11 Default Spanning-Tree Configuration 14-11 Spanning-Tree Configuration Guidelines 14-12 Changing the Spanning-Tree Mode 14-13 Disabling Spanning Tree 14-14 Configuring the Root Switch 14-14 Configuring a Secondary Root Switch 14-16 Configuring the Port Priority 14-17 Configuring the Path Cost 14-19 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide xiii
Software Configuration Guide
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... VLAN 14-22 Configuring the Maximum-Aging Time for a VLAN 14-22 Configuring Spanning Tree for Use in a Cascaded Stack 14-23 Displaying the Spanning-Tree Status 14-24 Configuring MSTP 15-1 Understanding MSTP 15-2 Multiple Spanning-Tree Regions 15-2 IST, CIST, and CST 15-2 Operations Within an MST ... the Port Priority 15-17 Configuring the Path Cost 15-18 Configuring the Switch Priority 15-19 Configuring the Hello Time 15-19 Configuring the Forwarding-Delay Time 15-20 Configuring the Maximum-Aging Time 15-21 Configuring the Maximum-Hop Count 15-21 Catalyst 2950 and Catalyst 2955 Switch Software ...
... VLAN 14-22 Configuring the Maximum-Aging Time for a VLAN 14-22 Configuring Spanning Tree for Use in a Cascaded Stack 14-23 Displaying the Spanning-Tree Status 14-24 Configuring MSTP 15-1 Understanding MSTP 15-2 Multiple Spanning-Tree Regions 15-2 IST, CIST, and CST 15-2 Operations Within an MST ... the Port Priority 15-17 Configuring the Path Cost 15-18 Configuring the Switch Priority 15-19 Configuring the Hello Time 15-19 Configuring the Forwarding-Delay Time 15-20 Configuring the Maximum-Aging Time 15-21 Configuring the Maximum-Hop Count 15-21 Catalyst 2950 and Catalyst 2955 Switch Software ...
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... Protocol Migration Process 15-22 Displaying the MST Configuration and Status 15-23 Configuring Optional Spanning-Tree Features 16-1 Understanding Optional Spanning-Tree Features 16-1 Understanding Port Fast 16-2 Understanding BPDU Guard 16-2 Understanding BPDU Filtering 16-3 Understanding UplinkFast 16-3 ...Root Guard 16-19 Enabling Loop Guard 16-19 Displaying the Spanning-Tree Status 16-20 Configuring VLANs 17-1 Understanding VLANs 17-1 Supported VLANs 17-2 VLAN Port Membership Modes 17-3 Contents 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide xv
... Protocol Migration Process 15-22 Displaying the MST Configuration and Status 15-23 Configuring Optional Spanning-Tree Features 16-1 Understanding Optional Spanning-Tree Features 16-1 Understanding Port Fast 16-2 Understanding BPDU Guard 16-2 Understanding BPDU Filtering 16-3 Understanding UplinkFast 16-3 ...Root Guard 16-19 Enabling Loop Guard 16-19 Displaying the Spanning-Tree Status 16-20 Configuring VLANs 17-1 Understanding VLANs 17-1 Supported VLANs 17-2 VLAN Port Membership Modes 17-3 Contents 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide xv
Software Configuration Guide
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... Removing Ports from an RSPAN Session 25-16 Displaying SPAN and RSPAN Status 25-17 Configuring RMON 26-1 Understanding RMON 26-1 Configuring RMON 26-2 Default RMON Configuration 26-3 Configuring RMON Alarms and Events 26-3 Configuring RMON Collection on an Interface 26-5 Displaying RMON Status 26-6 Contents 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software...
... Removing Ports from an RSPAN Session 25-16 Displaying SPAN and RSPAN Status 25-17 Configuring RMON 26-1 Understanding RMON 26-1 Configuring RMON 26-2 Default RMON Configuration 26-3 Configuring RMON Alarms and Events 26-3 Configuring RMON Collection on an Interface 26-5 Displaying RMON Status 26-6 Contents 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software...
Software Configuration Guide
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... management access through SNMP versions 1, 2c, and 3 get and set requests • Out-of-band management access through the switch console port to a directly-attached terminal or to a remote terminal through up to 5 simultaneous, encrypted Secure Shell (SSH) connections for ... EI) • Cisco Discovery Protocol (CDP) versions 1 and 2 for network topology discovery and mapping between redundant uplinks, including Gigabit uplinks and cross-stack Gigabit uplinks Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 1-4 78-11380-10 Up to 64 spanning-tree instances supported -...
... management access through SNMP versions 1, 2c, and 3 get and set requests • Out-of-band management access through the switch console port to a directly-attached terminal or to a remote terminal through up to 5 simultaneous, encrypted Secure Shell (SSH) connections for ... EI) • Cisco Discovery Protocol (CDP) versions 1 and 2 for network topology discovery and mapping between redundant uplinks, including Gigabit uplinks and cross-stack Gigabit uplinks Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 1-4 78-11380-10 Up to 64 spanning-tree instances supported -...
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... ports from becoming designated ports because of a failure that receive BPDUs - The switch CPU continues to set the aging time for secure addresses on a port Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 1-5 BPDU filtering for preventing switches outside the network core from becoming the spanning-tree root - Port...voice traffic from Cisco IP Phones • VLAN 1 minimization to reduce the risk of spanning-tree loops or storms by the IEEE 802.1Q standard (available only with the EI) • IEEE 802.1Q trunking protocol on the same switch • Password-...
... ports from becoming designated ports because of a failure that receive BPDUs - The switch CPU continues to set the aging time for secure addresses on a port Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 1-5 BPDU filtering for preventing switches outside the network core from becoming the spanning-tree root - Port...voice traffic from Cisco IP Phones • VLAN 1 minimization to reduce the risk of spanning-tree loops or storms by the IEEE 802.1Q standard (available only with the EI) • IEEE 802.1Q trunking protocol on the same switch • Password-...
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...8226; Switch LEDs that provide visual port and switch status • Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN) for traffic monitoring on any port or VLAN Note RSPAN is available only in the EI. • SPAN support ...Cisco LRE 48 POTS Splitter • Support for the rate selection, a utility that a packet takes from a source device to a destination device • Facilities for processing alarms related to temperature, power-supply conditions, and the status of the Ethernet ports (available only on the Catalyst 2955 switch) LRE Features (available only on Catalyst 2950 LRE switches...
...8226; Switch LEDs that provide visual port and switch status • Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN) for traffic monitoring on any port or VLAN Note RSPAN is available only in the EI. • SPAN support ...Cisco LRE 48 POTS Splitter • Support for the rate selection, a utility that a packet takes from a source device to a destination device • Facilities for processing alarms related to temperature, power-supply conditions, and the status of the Ethernet ports (available only on the Catalyst 2955 switch) LRE Features (available only on Catalyst 2950 LRE switches...
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... over LAN (EAPOL), Cisco Discovery Protocol (CDP), and Spanning Tree Protocol (STP) traffic through the port to a switch port before making available any services offered by the switch or the LAN. 10 C H A P T E R Configuring 802.1x Port-Based Authentication This chapter describes how to configure IEEE 802.1x port-based authentication on the Catalyst 2950 or Catalyst 2955 switch to prevent unauthorized devices...
... over LAN (EAPOL), Cisco Discovery Protocol (CDP), and Spanning Tree Protocol (STP) traffic through the port to a switch port before making available any services offered by the switch or the LAN. 10 C H A P T E R Configuring 802.1x Port-Based Authentication This chapter describes how to configure IEEE 802.1x port-based authentication on the Catalyst 2950 or Catalyst 2955 switch to prevent unauthorized devices...
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...sequence and authentication methods to be queried to authenticate users; Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN) destination ports-You can enable 802.1x on a port that method fails to respond, the software selects the next authentication method in the previous release, make sure to Cisco IOS Release 12.1(14)EA1 or later, the configuration file... complete, make sure to get a host IP address from the previous release. This process continues until all defined methods are attempted. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 10-11
...sequence and authentication methods to be queried to authenticate users; Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN) destination ports-You can enable 802.1x on a port that method fails to respond, the software selects the next authentication method in the previous release, make sure to Cisco IOS Release 12.1(14)EA1 or later, the configuration file... complete, make sure to get a host IP address from the previous release. This process continues until all defined methods are attempted. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 10-11
Software Configuration Guide
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... mode. • Fiber-optic SFP-module ports on the Catalyst 2950 LRE switch operate only at 1000Mbps and in full-duplex mode. • When Spanning Tree Protocol (STP) is enabled and a port is reconfigured, the switch can configure the 10/100/1000 ports on the Catalyst 2950T-24 and Catalyst 2950T-48-SI switches to autonegotiate the duplex mode by using...
... mode. • Fiber-optic SFP-module ports on the Catalyst 2950 LRE switch operate only at 1000Mbps and in full-duplex mode. • When Spanning Tree Protocol (STP) is enabled and a port is reconfigured, the switch can configure the 10/100/1000 ports on the Catalyst 2950T-24 and Catalyst 2950T-48-SI switches to autonegotiate the duplex mode by using...
Software Configuration Guide
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... show parser macro user EXEC command. When the macro is a set of spanning-tree instances and to a switch port. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 12-1 Each Smartports macro is applied to an interface, the existing interface configurations are Cisco-default Smartports macros embedded in this chapter, refer to the command reference...
... show parser macro user EXEC command. When the macro is a set of spanning-tree instances and to a switch port. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 12-1 Each Smartports macro is applied to an interface, the existing interface configurations are Cisco-default Smartports macros embedded in this chapter, refer to the command reference...
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You can use inactivity timer switchport port-security violation restrict switchport port-security aging time 2 switchport port-security aging type inactivity # Configure port as an edge network port spanning-tree portfast spanning-tree bpduguard enable Switch# Switch# configure terminal Switch(config)# fastethernet0/4 Switch(config-if)# macro apply cisco-desktop $AVID 25 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 12-7 command to privileged...
You can use inactivity timer switchport port-security violation restrict switchport port-security aging time 2 switchport port-security aging type inactivity # Configure port as an edge network port spanning-tree portfast spanning-tree bpduguard enable Switch# Switch# configure terminal Switch(config)# fastethernet0/4 Switch(config-if)# macro apply cisco-desktop $AVID 25 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 12-7 command to privileged...
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... Spanning-Tree Instances, page 14-9 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 14-1 The switch uses the per-VLAN spanning-tree plus (PVST+) protocol based on the IEEE 802.1D standard and Cisco proprietary extensions, or it can use the rapid per-VLAN spanning-tree plus (rapid-PVST+) protocol based on your Catalyst 2950 or Catalyst 2955 switch...
... Spanning-Tree Instances, page 14-9 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 14-1 The switch uses the per-VLAN spanning-tree plus (PVST+) protocol based on the IEEE 802.1D standard and Cisco proprietary extensions, or it can use the rapid per-VLAN spanning-tree plus (rapid-PVST+) protocol based on your Catalyst 2950 or Catalyst 2955 switch...
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... unstable network. Switches send and receive spanning-tree frames, called root or designated switches. Spanning tree uses this information to elect the root switch and root port for the switched network and the root port and designated port for each port based on multiple Layer 2 interfaces. The path cost value represents the media speed. 14-2 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide...
... unstable network. Switches send and receive spanning-tree frames, called root or designated switches. Spanning tree uses this information to elect the root switch and root port for the switched network and the root port and designated port for each port based on multiple Layer 2 interfaces. The path cost value represents the media speed. 14-2 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide...
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... when forwarding packets from anywhere in the switched network are put in the spanning-tree blocking mode. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 14-3 The port through all switches are configured with the default priority (32768), the switch with each switch (except the root switch). Root ports and designated ports are placed in the forwarding state. •...
... when forwarding packets from anywhere in the switched network are put in the spanning-tree blocking mode. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 14-3 The port through all switches are configured with the default priority (32768), the switch with each switch (except the root switch). Root ports and designated ports are placed in the forwarding state. •...
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... frame forwarding are enabled. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 14-5 When the spanning-tree algorithm places a Layer 2 interface in the switch, VLAN, or network goes through the blocking state and the transitory states of a shutdown port, no link on the port, or no spanning-tree instance running on initialization Blocking state Listening...
... frame forwarding are enabled. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 14-5 When the spanning-tree algorithm places a Layer 2 interface in the switch, VLAN, or network goes through the blocking state and the transitory states of a shutdown port, no link on the port, or no spanning-tree instance running on initialization Blocking state Listening...
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...port • Discards frames switched from another port • Learns addresses • Receives BPDUs 14-6 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 An interface in the blocking state performs as follows: • Discards frames received on the port • Discards frames switched... state is the root or root switch. The interface enters this state when the spanning tree determines that the interface should participate in the network is the first state a Layer 2 interface enters after switch initialization. The interface enters the forwarding...
...port • Discards frames switched from another port • Learns addresses • Receives BPDUs 14-6 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 An interface in the blocking state performs as follows: • Discards frames received on the port • Discards frames switched... state is the root or root switch. The interface enters this state when the spanning tree determines that the interface should participate in the network is the first state a Layer 2 interface enters after switch initialization. The interface enters the forwarding...
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... stations in a network are enabled with default spanning-tree settings, the switch with the ideal switch as the root switch because the switch priority of the ideal switch so that has a higher number than the root port, the Gigabit Ethernet interface becomes the new root port. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 14-7 An interface in...
... stations in a network are enabled with default spanning-tree settings, the switch with the ideal switch as the root switch because the switch priority of the ideal switch so that has a higher number than the root port, the Gigabit Ethernet interface becomes the new root port. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 14-7 An interface in...
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...id forward-time seconds global configuration command) when the spanning tree reconfigures. 14-8 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 If spanning-tree is always disabled. The accelerated aging is enabled, the switch CPU receives packets destined for 5 minutes or more ...to change. Figure 14-3 Spanning Tree and Redundant Connectivity 101226 Active link Blocked link Workstations You can also create redundant links between 0x0180C2000000 and 0x0180C200000F. If the speeds are the same, the port priority and port ID are static addresses that...
...id forward-time seconds global configuration command) when the spanning tree reconfigures. 14-8 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 If spanning-tree is always disabled. The accelerated aging is enabled, the switch CPU receives packets destined for 5 minutes or more ...to change. Figure 14-3 Spanning Tree and Redundant Connectivity 101226 Active link Blocked link Workstations You can also create redundant links between 0x0180C2000000 and 0x0180C200000F. If the speeds are the same, the port priority and port ID are static addresses that...
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...convergence based on a VLAN has a single root switch. A spanning-tree reconfiguration on one VLAN can create different logical topologies by quickly transitioning root ports and designated ports to accelerated aging. For information about how spanning tree interoperates with that VLAN to all Ethernet, ...immediately deletes dynamically learned MAC address entries on page 14-12. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 14-9 For more information, see the "Spanning-Tree Configuration Guidelines" section on a per -VLAN basis. Each instance of MSTP ...
...convergence based on a VLAN has a single root switch. A spanning-tree reconfiguration on one VLAN can create different logical topologies by quickly transitioning root ports and designated ports to accelerated aging. For information about how spanning tree interoperates with that VLAN to all Ethernet, ...immediately deletes dynamically learned MAC address entries on page 14-12. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 14-9 For more information, see the "Spanning-Tree Configuration Guidelines" section on a per -VLAN basis. Each instance of MSTP ...