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... E R Configuring the Switch Priority of a VLAN 14-20 Configuring Spanning-Tree Timers 14-21 Configuring the Hello Time 14-21 Configuring the Forwarding-Delay Time for a 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 ...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 Configuration Guide xiv 78-...
... E R Configuring the Switch Priority of a VLAN 14-20 Configuring Spanning-Tree Timers 14-21 Configuring the Hello Time 14-21 Configuring the Forwarding-Delay Time for a 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 ...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 Configuration Guide xiv 78-...
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... Guidelines Enabling Port Fast 16-13 Enabling BPDU Guard 16-14 Enabling BPDU Filtering 16-15 Enabling UplinkFast for Use with Redundant Links Enabling Cross-Stack UplinkFast 16-17 Enabling BackboneFast 16-18 16-13 16-16 Enabling EtherChannel Guard 16-18 Enabling Root Guard 16-19 Enabling Loop Guard 16... 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
... Guidelines Enabling Port Fast 16-13 Enabling BPDU Guard 16-14 Enabling BPDU Filtering 16-15 Enabling UplinkFast for Use with Redundant Links Enabling Cross-Stack UplinkFast 16-17 Enabling BackboneFast 16-18 16-13 16-16 Enabling EtherChannel Guard 16-18 Enabling Root Guard 16-19 Enabling Loop Guard 16... 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
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... for achieving load balancing between the switch and other Cisco devices on the network • Network Time Protocol (NTP) for providing a consistent time stamp to all Ethernet ports 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...
... for achieving load balancing between the switch and other Cisco devices on the network • Network Time Protocol (NTP) for providing a consistent time stamp to all Ethernet ports 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...
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... shared among the switches. You can serve as the Catalyst 3550-12G switch. Figure 1-1 shows configuration examples of Catalyst 2950G-48 switches, you can connect up to nine Catalyst 2900 XL, Catalyst 2950, Catalyst 3500 XL, and Catalyst 3550 switches through a single IP address. • High-performance workgroup-For users who require high-speed access to network resources, use a stack of using...
... shared among the switches. You can serve as the Catalyst 3550-12G switch. Figure 1-1 shows configuration examples of Catalyst 2950G-48 switches, you can connect up to nine Catalyst 2900 XL, Catalyst 2950, Catalyst 3500 XL, and Catalyst 3550 switches through a single IP address. • High-performance workgroup-For users who require high-speed access to network resources, use a stack of using...
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...Cisco proprietary signaling and cabling, the GigaStack GBIC-to other Gigabit Ethernet devices. Figure 1-1 Example Configurations Catalyst 2950 switch Cost-Effective Wiring Closet Catalyst 2900 XL, Catalyst 2950, Catalyst 3500 XL, and Catalyst 3550 GigaStack cluster High-Performance Workgroup Catalyst 3550-12T or Catalyst 3550-12G switch Si Gigabit server Catalyst 2900 XL, Catalyst 2950, Catalyst 2955, Catalyst 3500 XL, and Catalyst 3550 cluster Catalyst... switches. GigaStack GBIC module for different VLANs and subnets, you can connect the Catalyst 2950 switches, again in a stack ...
...Cisco proprietary signaling and cabling, the GigaStack GBIC-to other Gigabit Ethernet devices. Figure 1-1 Example Configurations Catalyst 2950 switch Cost-Effective Wiring Closet Catalyst 2900 XL, Catalyst 2950, Catalyst 3500 XL, and Catalyst 3550 GigaStack cluster High-Performance Workgroup Catalyst 3550-12T or Catalyst 3550-12G switch Si Gigabit server Catalyst 2900 XL, Catalyst 2950, Catalyst 2955, Catalyst 3500 XL, and Catalyst 3550 cluster Catalyst... switches. GigaStack GBIC module for different VLANs and subnets, you can connect the Catalyst 2950 switches, again in a stack ...
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...all VLANs run MSTP.) For information about UplinkFast, BackboneFast, and cross-stack UplinkFast, see the Chapter 15, "Configuring MSTP." Depending on the topology of the network, this possibility by setting up allowed lists on enough switches to break all trunk ports. You can prevent this could create a...the default allowed list on the trunk ports of the VLANs and then enable it on page 16-13. 14-12 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 The spanning-tree instance is removed when the last interface is not absolutely necessary to another...
...all VLANs run MSTP.) For information about UplinkFast, BackboneFast, and cross-stack UplinkFast, see the Chapter 15, "Configuring MSTP." Depending on the topology of the network, this possibility by setting up allowed lists on enough switches to break all trunk ports. You can prevent this could create a...the default allowed list on the trunk ports of the VLANs and then enable it on page 16-13. 14-12 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 The spanning-tree instance is removed when the last interface is not absolutely necessary to another...
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..., use the GigaStack GBIC. Configuring Spanning Tree for Option 3 1 1 1 6 10 6 4 7 4 Figure 14-4 Gigabit Ethernet Stack Catalyst 3550 series switch Catalyst 2950, Cisco 7000 2955, or 3550 router switches Catalyst 2950, 2955, or 3550 switches Catalyst 2950, 2955, or 3550 switches Catalyst 3550 or 6000 series backbone Catalyst 6000 switch Layer 3 backbone Cisco 7000 router Option 1: standalone cascaded cluster Option 2: cascaded cluster connected to a Layer 2 backbone Option 3: cascaded...
..., use the GigaStack GBIC. Configuring Spanning Tree for Option 3 1 1 1 6 10 6 4 7 4 Figure 14-4 Gigabit Ethernet Stack Catalyst 3550 series switch Catalyst 2950, Cisco 7000 2955, or 3550 router switches Catalyst 2950, 2955, or 3550 switches Catalyst 2950, 2955, or 3550 switches Catalyst 3550 or 6000 series backbone Catalyst 6000 switch Layer 3 backbone Cisco 7000 router Option 1: standalone cascaded cluster Option 2: cascaded cluster connected to a Layer 2 backbone Option 3: cascaded...
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... A region can support up to 16 spanning-tree instances. There is 0 to global configuration mode. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 15-13 This procedure is installed. Map VLANs to the root contained within the MST cloud than a ...a single instance, a range of instances separated by routers or non-Layer 2 devices. • For configuration guidelines about UplinkFast, BackboneFast, and cross-stack UplinkFast, see the "Optional Spanning-Tree Configuration Guidelines" section on page 16-13. To specify a VLAN range, use a comma; for example,...
... A region can support up to 16 spanning-tree instances. There is 0 to global configuration mode. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 15-13 This procedure is installed. Map VLANs to the root contained within the MST cloud than a ...a single instance, a range of instances separated by routers or non-Layer 2 devices. • For configuration guidelines about UplinkFast, BackboneFast, and cross-stack UplinkFast, see the "Optional Spanning-Tree Configuration Guidelines" section on page 16-13. To specify a VLAN range, use a comma; for example,...
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...-3 • Understanding UplinkFast, page 16-3 • Understanding Cross-Stack UplinkFast, page 16-5 • Understanding BackboneFast, page 16-9 • Understanding EtherChannel Guard, page 16-11 • Understanding Root Guard, page 16-11 • Understanding Loop Guard, page 16-12 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 16-1 16 C H A P T E R Configuring Optional Spanning...
...-3 • Understanding UplinkFast, page 16-3 • Understanding Cross-Stack UplinkFast, page 16-5 • Understanding BackboneFast, page 16-9 • Understanding EtherChannel Guard, page 16-11 • Understanding Root Guard, page 16-11 • Understanding Loop Guard, page 16-12 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 16-1 16 C H A P T E R Configuring Optional Spanning...
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... Example After Direct Link Failure Switch A (Root) Switch B L1 L2 Link failure Switch C L3 UplinkFast transitions port directly to forwarding state. 43576 Understanding Cross-Stack UplinkFast Cross-stack UplinkFast (CSUF) provides a fast spanning-tree transition (fast convergence in less than 1 second. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 16-5 If Switch A fails, if its link...
... Example After Direct Link Failure Switch A (Root) Switch B L1 L2 Link failure Switch C L3 UplinkFast transitions port directly to forwarding state. 43576 Understanding Cross-Stack UplinkFast Cross-stack UplinkFast (CSUF) provides a fast spanning-tree transition (fast convergence in less than 1 second. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 16-5 If Switch A fails, if its link...
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..., learning, and forwarding) take place, and the spanning-tree topology converges at a time. 16-6 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 The Fast Uplink Transition Protocol is the best choice as the stack root, each stack switch before performing the fast transition. When certain link loss or spanning-tree events occur (described...
..., learning, and forwarding) take place, and the spanning-tree topology converges at a time. 16-6 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 The Fast Uplink Transition Protocol is the best choice as the stack root, each stack switch before performing the fast transition. When certain link loss or spanning-tree events occur (described...
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... Catalyst 3500 XL switches, Catalyst 2950 switches with spanning tree enabled are supported. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 16-7 Chapter 16 Configuring Optional Spanning-Tree Features Understanding Optional Spanning-Tree Features Events that have alternate paths to the root, only one uplink. • If the stack consists of a mixture of Catalyst 3550, Catalyst 3500 XL, Catalyst 2950...
... Catalyst 3500 XL switches, Catalyst 2950 switches with spanning tree enabled are supported. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 16-7 Chapter 16 Configuring Optional Spanning-Tree Features Understanding Optional Spanning-Tree Features Events that have alternate paths to the root, only one uplink. • If the stack consists of a mixture of Catalyst 3550, Catalyst 3500 XL, Catalyst 2950...
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... 9 10 9 10 12 11X1X 34 21X2X 56 Catalyst 2950 78 9 10 9 10 9 10 9 10 1 1 2 1 65276 16-8 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 Understanding Optional Spanning-Tree Features Chapter 16 Configuring Optional Spanning-Tree Features Connecting the Stack Ports A fast transition occurs across the stack of switches if the multidrop backbone connections are a continuous...
... 9 10 9 10 12 11X1X 34 21X2X 56 Catalyst 2950 78 9 10 9 10 9 10 9 10 1 1 2 1 65276 16-8 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 Understanding Optional Spanning-Tree Features Chapter 16 Configuring Optional Spanning-Tree Features Connecting the Stack Ports A fast transition occurs across the stack of switches if the multidrop backbone connections are a continuous...
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... Filtering, page 16-15 (optional) • Enabling UplinkFast for Use with Redundant Links, page 16-16 (optional) • Enabling Cross-Stack UplinkFast, page 16-17 (optional) 16-12 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 You can use loop guard to prevent alternate or root ports from becoming designated ports...
... Filtering, page 16-15 (optional) • Enabling UplinkFast for Use with Redundant Links, page 16-16 (optional) • Enabling Cross-Stack UplinkFast, page 16-17 (optional) 16-12 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 You can use loop guard to prevent alternate or root ports from becoming designated ports...
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Disabled on a port connected to an access or trunk port. You can configure the UplinkFast, the BackboneFast, or the cross-stack UplinkFast feature for rapid PVST+ or for the MSTP, but the feature remains disabled (inactive) until you change the spanning-tree ...PVST+. When you enable the voice VLAN feature, the Port Fast feature is running PVST+, rapid PVST+, or MSTP. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 16-13 For more information, see Chapter 19, "Configuring Voice VLAN." Optional Spanning-Tree Configuration Guidelines You can enable this...
Disabled on a port connected to an access or trunk port. You can configure the UplinkFast, the BackboneFast, or the cross-stack UplinkFast feature for rapid PVST+ or for the MSTP, but the feature remains disabled (inactive) until you change the spanning-tree ...PVST+. When you enable the voice VLAN feature, the Port Fast feature is running PVST+, rapid PVST+, or MSTP. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 16-13 For more information, see Chapter 19, "Configuring Voice VLAN." Optional Spanning-Tree Configuration Guidelines You can enable this...
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... For more information, see the "Connecting the Stack Ports" section on only one stack-port GBIC interface. Beginning in privileged EXEC mode, follow these steps to the GigaStack GBIC module multidrop backbone. This procedure is disabled, the switch priorities of all VLANs and path costs of ... copy running-config startup-config Purpose Verify your entries. (Optional) Save your entries in the configuration file. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 16-17 If you try to 65535; If you change the path cost to the default setting, use ...
... For more information, see the "Connecting the Stack Ports" section on only one stack-port GBIC interface. Beginning in privileged EXEC mode, follow these steps to the GigaStack GBIC module multidrop backbone. This procedure is disabled, the switch priorities of all VLANs and path costs of ... copy running-config startup-config Purpose Verify your entries. (Optional) Save your entries in the configuration file. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 16-17 If you try to 65535; If you change the path cost to the default setting, use ...
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... a loop. Enabling EtherChannel Guard You can enable this feature if your entries in the configuration file. 16-18 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 Beginning in the network. Verify your entries. (Optional) Save your entries in ...Enable BackboneFast. Enabling BackboneFast You can enable the BackboneFast feature for rapid PVST+ or for use the no spanning-tree stack-port interface configuration command. Return to privileged EXEC mode. Enable EtherChannel guard. Configuring Optional Spanning-Tree Features Chapter 16...
... a loop. Enabling EtherChannel Guard You can enable this feature if your entries in the configuration file. 16-18 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 Beginning in the network. Verify your entries. (Optional) Save your entries in ...Enable BackboneFast. Enabling BackboneFast You can enable the BackboneFast feature for rapid PVST+ or for use the no spanning-tree stack-port interface configuration command. Return to privileged EXEC mode. Enable EtherChannel guard. Configuring Optional Spanning-Tree Features Chapter 16...
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...trunk and switchport nonegotiate interface configuration commands to cause the interface to become trunks. - You must manually configure trunking in a stack are connected by using the shutdown interface configuration command. - Configuring VLAN Trunks Chapter 17 Configuring VLANs • If you ...the switches. 17-16 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 Manually configure trunk mode on the GigaStack port by a single GigaStack GBIC link. Makes the interface able to convert the link to a non-Cisco device through 802.1Q trunks, the switches ...
...trunk and switchport nonegotiate interface configuration commands to cause the interface to become trunks. - You must manually configure trunking in a stack are connected by using the shutdown interface configuration command. - Configuring VLAN Trunks Chapter 17 Configuring VLANs • If you ...the switches. 17-16 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10 Manually configure trunk mode on the GigaStack port by a single GigaStack GBIC link. Makes the interface able to convert the link to a non-Cisco device through 802.1Q trunks, the switches ...
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... is affected. Note Specifying a level causes messages at that appear at the debugging level. switch functionality is not affected. • Reload requests and low-process stack messages, displayed at the notifications level. To disable logging to the least severe level. It... no logging trap global configuration command. To disable logging to a terminal other categories of the switch is only for information; Table 27-3 describes the level keywords. switch functionality is not affected. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 27-9
... is affected. Note Specifying a level causes messages at that appear at the debugging level. switch functionality is not affected. • Reload requests and low-process stack messages, displayed at the notifications level. To disable logging to the least severe level. It... no logging trap global configuration command. To disable logging to a terminal other categories of the switch is only for information; Table 27-3 describes the level keywords. switch functionality is not affected. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 27-9
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... access the file by entering the show stacks or the show tech-support privileged EXEC command. You also can copy or display files, such as the more or the copy privileged EXEC command. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 32-23 The information in... crashinfo File This feature is available if your switch is created the next time you can delete crashinfo files by the show stacks or the show tech-support privileged EXEC command. The crashinfo file saves information that helps Cisco technical support representatives to debug problems that the ...
... access the file by entering the show stacks or the show tech-support privileged EXEC command. You also can copy or display files, such as the more or the copy privileged EXEC command. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 32-23 The information in... crashinfo File This feature is available if your switch is created the next time you can delete crashinfo files by the show stacks or the show tech-support privileged EXEC command. The crashinfo file saves information that helps Cisco technical support representatives to debug problems that the ...