Cisco NM-8B-U User Guide - Page 128
Disabling the Spanning Tree on an Interface, no bridge, max-age, bridge-group, spanning-disabled
UPC - 074632001001
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Configuration Tasks 16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Changing the Maximum-Idle Interval If a switch does not hear BPDUs from the root switch within a specified interval, it recomputes the spanning-tree topology. Beginning in privileged EXEC mode, follow these steps to change the maximum-idle interval (maximum aging time): Step 1 Step 2 Command configure terminal bridge bridge-group max-age seconds Step 3 Step 4 Step 5 end show running-config copy running-config startup-config Purpose Enters global configuration mode. Specifies the interval the switch waits to hear BPDUs from the root switch. • For bridge-group, specify the bridge group number. The range is 1 to 255. • For seconds, enter a number from 10 to 200. The default is 30 seconds. Returns to privileged EXEC mode. Verifies your entry. (Optional) Saves your entry in the configuration file. To return to the default setting, use the no bridge bridge-group max-age global configuration command. Disabling the Spanning Tree on an Interface When a loop-free path exists between any two switched subnetworks, you can prevent BPDUs generated in one switching subnetwork from impacting devices in the other switching subnetwork, yet still permit switching throughout the network as a whole. For example, when switched LAN subnetworks are separated by a WAN, BPDUs can be prevented from traveling across the WAN link. Beginning in privileged EXEC mode, follow these steps to disable spanning tree on an interface: Step 1 Step 2 Step 3 Command configure terminal interface interface-id bridge-group bridge-group spanning-disabled Step 4 Step 5 Step 6 end show running-config copy running-config startup-config Purpose Enters global configuration mode. Enters interface configuration mode, and specify the interface ID. Disables spanning tree on the interface. For bridge-group, specify the bridge group number. The range is 1 to 255. Returns to privileged EXEC mode. Verifies your entry. (Optional) Saves your entry in the configuration file. To reenable spanning tree on the interface, use the no bridge-group bridge-group spanning-disabled interface configuration command. 128 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ