User Guide
Page 4
...the line as a single trunk link between the switches. The 802.1Q cloud separating the Cisco switches that the native VLAN for the specific VLAN. Feature Overview 16- Table 1 Default Layer 2 Ethernet Interface Configuration Feature Interface mode Trunk encapsulation Allowed VLAN range...port priority STP port cost Default Value switchport mode access / trunk switchport trunk encapsulation dot1q VLANs 1-1005 VLAN 1 VLAN 1 Enabled for Gigabit Ethernet interfaces operated in access mode regardless of spanning tree for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Layer ...
...the line as a single trunk link between the switches. The 802.1Q cloud separating the Cisco switches that the native VLAN for the specific VLAN. Feature Overview 16- Table 1 Default Layer 2 Ethernet Interface Configuration Feature Interface mode Trunk encapsulation Allowed VLAN range...port priority STP port cost Default Value switchport mode access / trunk switchport trunk encapsulation dot1q VLANs 1-1005 VLAN 1 VLAN 1 Enabled for Gigabit Ethernet interfaces operated in access mode regardless of spanning tree for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Layer ...
User Guide
Page 8
...EtherChannel (maximum of eight interfaces) with different Spanning Tree Protocol (STP) port path costs can pass through the port. If the allowed range of the remaining interfaces in your... speed and duplex mode. • Enable all interfaces in the channel; Feature Overview 16- For example, if the traffic on all interfaces in better load balancing. Interfaces with...port to a switch port before making available any services offered by itself, make interfaces incompatible for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Use the option that interfaces be created...
...EtherChannel (maximum of eight interfaces) with different Spanning Tree Protocol (STP) port path costs can pass through the port. If the allowed range of the remaining interfaces in your... speed and duplex mode. • Enable all interfaces in the channel; Feature Overview 16- For example, if the traffic on all interfaces in better load balancing. Interfaces with...port to a switch port before making available any services offered by itself, make interfaces incompatible for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Use the option that interfaces be created...
User Guide
Page 12
...the network. Figure 3 Wireless LAN Example Access point Cisco router with a root switch and a loop-free path from the root to the port are part of a loop, the spanning tree port priority and port path cost setting determine which port is put in the forwarding ... with Ethernet switch network module Authentication server (RADIUS) 88850 Wireless client Spanning Tree Protocol This section describes how to all VLANs. Feature Overview 16- If the port becomes unauthorized (reauthentication fails or an EAPOL-logoff message is a Layer 2 link management protocol that you must have a...
...the network. Figure 3 Wireless LAN Example Access point Cisco router with a root switch and a loop-free path from the root to the port are part of a loop, the spanning tree port priority and port path cost setting determine which port is put in the forwarding ... with Ethernet switch network module Authentication server (RADIUS) 88850 Wireless client Spanning Tree Protocol This section describes how to all VLANs. Feature Overview 16- If the port becomes unauthorized (reauthentication fails or an EAPOL-logoff message is a Layer 2 link management protocol that you must have a...
User Guide
Page 13
...the logical center of the switch that are selected. • Election of the Root Bridge. 16- All paths that the transmitting switch believes to be the root switch • The spanning tree path cost to the root • The bridge ID of the transmitting bridge • Message age ...switch sends configuration BPDUs to the root. • A root port is selected. and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Feature Overview Bridge Protocol Data Units The stable active spanning tree topology of the transmitting port • Values for...
...the logical center of the switch that are selected. • Election of the Root Bridge. 16- All paths that the transmitting switch believes to be the root switch • The spanning tree path cost to the root • The bridge ID of the transmitting bridge • Message age ...switch sends configuration BPDUs to the root. • A root port is selected. and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Feature Overview Bridge Protocol Data Units The stable active spanning tree topology of the transmitting port • Values for...
User Guide
Page 21
..., spanning tree considers port priority when selecting an interface to put into the forwarding state. Cisco IOS software uses the port priority value when the interface is configured as a trunk port. 16- You can assign lower cost values to interfaces that you want spanning tree to select first, and lower priority values to...
..., spanning tree considers port priority when selecting an interface to put into the forwarding state. Cisco IOS software uses the port priority value when the interface is configured as a trunk port. 16- You can assign lower cost values to interfaces that you want spanning tree to select first, and lower priority values to...
User Guide
Page 22
...Before Indirect Link Failure Switch A (Root) Switch B L1 L2 L3 Blocked port Switch C 44963 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ 22 Spanning tree uses the port cost value when the interface is configured as a trunk port. An inferior BPDU identifies one or more ...link L1 and to the root switch. Feature Overview 16- If all ports on which it has an alternate path to expire. Under STP rules, the switch ignores inferior BPDUs for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series cost values to interfaces that it still has an alternate path...
...Before Indirect Link Failure Switch A (Root) Switch B L1 L2 L3 Blocked port Switch C 44963 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ 22 Spanning tree uses the port cost value when the interface is configured as a trunk port. An inferior BPDU identifies one or more ...link L1 and to the root switch. Feature Overview 16- If all ports on which it has an alternate path to expire. Under STP rules, the switch ignores inferior BPDUs for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series cost values to interfaces that it still has an alternate path...
User Guide
Page 67
16- The switch maintains a separate instance of transitions to verify spanning tree configuration: Router# show spanning-tree vlan command to forwarding state: 1 BPDU: sent 3, received 3417 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ 67 Designated root has priority 16384, ...0 Number of spanning tree for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration Tasks Configuring Spanning Tree • Enabling Spanning Tree, page 67 • Configuring Spanning Tree Port Priority, page 68 • Configuring Spanning Tree Port Cost, page 68 • Configuring ...
16- The switch maintains a separate instance of transitions to verify spanning tree configuration: Router# show spanning-tree vlan command to forwarding state: 1 BPDU: sent 3, received 3417 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ 67 Designated root has priority 16384, ...0 Number of spanning tree for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration Tasks Configuring Spanning Tree • Enabling Spanning Tree, page 67 • Configuring Spanning Tree Port Priority, page 68 • Configuring Spanning Tree Port Cost, page 68 • Configuring ...
User Guide
Page 68
...the port cost for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuring Spanning Tree Port Priority To configure the spanning tree port priority of an interface, use the following commands beginning in Cisco IOS Releases 12.1(2)E and earlier). Configuration Tasks 16- The... port-priority value can be from 1 to configure. Exits configuration mode. Use the no ] spanning-tree cost port-cost Purpose Selects an interface to restore the ...
...the port cost for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuring Spanning Tree Port Priority To configure the spanning tree port priority of an interface, use the following commands beginning in Cisco IOS Releases 12.1(2)E and earlier). Configuration Tasks 16- The... port-priority value can be from 1 to configure. Exits configuration mode. Use the no ] spanning-tree cost port-cost Purpose Selects an interface to restore the ...
User Guide
Page 69
...34c7 Designated bridge has priority 32768, address 0010.0d40.34c7 Designated port id is forwarding Port path cost 17, Port priority 64, Port Identifier 129.8. Exits configuration mode. 16- For most situations spanning-tree vlan vlan-id root primary and the spanning-tree vlan vlan-id ... the defaults. The bridge-priority value can be from 1 to restore the defaults. and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration Tasks Step 3 Command Router(config-if)# [no ] spanning-tree vlan vlan-id priority bridge-priority Step ...
...34c7 Designated bridge has priority 32768, address 0010.0d40.34c7 Designated port id is forwarding Port path cost 17, Port priority 64, Port Identifier 129.8. Exits configuration mode. 16- For most situations spanning-tree vlan vlan-id root primary and the spanning-tree vlan vlan-id ... the defaults. The bridge-priority value can be from 1 to restore the defaults. and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration Tasks Step 3 Command Router(config-if)# [no ] spanning-tree vlan vlan-id priority bridge-priority Step ...
User Guide
Page 81
...Layer 3 Parameters: IP ToS byte1 No No Differentiated Services Code Point (DSCP) No No IP source address Yes...relative to each protocol, refer to the Cisco IP Command Reference for each protocol type. Cisco IOS Release 12.2(2)XT, 12.2(8)T, and ... the end of service (TOS) minimize monetary cost bit. and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration ...Cisco IOS Release 12.2. You cannot reorder the list or selectively add or remove ACEs from a numbered list. For more details on the minimize-monetary-cost type of service...
...Layer 3 Parameters: IP ToS byte1 No No Differentiated Services Code Point (DSCP) No No IP source address Yes...relative to each protocol, refer to the Cisco IP Command Reference for each protocol type. Cisco IOS Release 12.2(2)XT, 12.2(8)T, and ... the end of service (TOS) minimize monetary cost bit. and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration ...Cisco IOS Release 12.2. You cannot reorder the list or selectively add or remove ACEs from a numbered list. For more details on the minimize-monetary-cost type of service...
User Guide
Page 121
...table aging time for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration Tasks Configuring Fallback Bridging This section describes how to configure fallback bridging on the switch. 16- and 36-Port ...Ethernet Switch Module for dynamic entries MAC-layer frame filtering Spanning tree parameters: • Switch priority • Interface priority • Interface path cost...
...table aging time for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration Tasks Configuring Fallback Bridging This section describes how to configure fallback bridging on the switch. 16- and 36-Port ...Ethernet Switch Module for dynamic entries MAC-layer frame filtering Spanning tree parameters: • Switch priority • Interface priority • Interface path cost...
User Guide
Page 124
...the Interface Priority, page 125 • Assigning a Path Cost, page 126 • Adjusting BPDU Intervals, page 126 • Disabling the Spanning Tree on an Interface, page 128 124 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ ...-group, specify the bridge group number. Parameters affecting the entire spanning tree are not suitable for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series To return to the default aging-time interval, use the software to configure specific administrative... and 36-Port Ethernet Switch Module for your entry. Configuration Tasks 16-
...the Interface Priority, page 125 • Assigning a Path Cost, page 126 • Adjusting BPDU Intervals, page 126 • Disabling the Spanning Tree on an Interface, page 128 124 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ ...-group, specify the bridge group number. Parameters affecting the entire spanning tree are not suitable for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series To return to the default aging-time interval, use the software to configure specific administrative... and 36-Port Ethernet Switch Module for your entry. Configuration Tasks 16-
User Guide
Page 126
...interface. • For bridge-group, specify the bridge group number. For 1000 Mbps, the default path cost is 100. - and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Step 3 Command bridge-group bridge-group priority number Step 4 Step 5 Step 6 end show...Interval between Hello BPDUs, page 127 126 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ For 10 Mbps, the default path cost is 4. For 100 Mbps, the default path cost is 128. To return to privileged EXEC mode. Configuration Tasks 16- The lower the number, the more likely...
...interface. • For bridge-group, specify the bridge group number. For 1000 Mbps, the default path cost is 100. - and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Step 3 Command bridge-group bridge-group priority number Step 4 Step 5 Step 6 end show...Interval between Hello BPDUs, page 127 126 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ For 10 Mbps, the default path cost is 4. For 100 Mbps, the default path cost is 128. To return to privileged EXEC mode. Configuration Tasks 16- The lower the number, the more likely...
User Guide
Page 136
... to forwarding state: 1 BPDU: sent 0, received 13513 Router# ! ! ! 16- Designated root has priority 32768, address 0010.0d40.34c7 Designated bridge has priority 32768, address 0010.0d40.34c7 Designated port id is 128.1, designated path cost 0 Timers: message age 2, forward delay 0, hold 0 Number of VLAN200 is ...spanning-tree port cost of a VLAN, page 137 • Hello Time Example, page 137 • Forward-Delay Time for a VLAN Example, page 137 • Maximum Aging Time for the 16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series ...
... to forwarding state: 1 BPDU: sent 0, received 13513 Router# ! ! ! 16- Designated root has priority 32768, address 0010.0d40.34c7 Designated bridge has priority 32768, address 0010.0d40.34c7 Designated port id is 128.1, designated path cost 0 Timers: message age 2, forward delay 0, hold 0 Number of VLAN200 is ...spanning-tree port cost of a VLAN, page 137 • Hello Time Example, page 137 • Forward-Delay Time for a VLAN Example, page 137 • Maximum Aging Time for the 16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series ...
User Guide
Page 137
...: Router# configure terminal Router(config)# spanning-tree vlan 200 max-age 36 Router(config)# end Router# Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ 137 16- and 36-Port Ethernet Switch Module The following example configures the maximum aging time for VLAN 200 to ... root has priority 32768, address 0010.0d40.34c7 Designated bridge has priority 32768, address 0010.0d40.34c7 Designated port id is 128.1, designated path cost 0 Timers: message age 2, forward delay 0, hold 0 Number of transitions to forwarding state: 1 BPDU: sent 0, received 13513 Router# The following example...
...: Router# configure terminal Router(config)# spanning-tree vlan 200 max-age 36 Router(config)# end Router# Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ 137 16- and 36-Port Ethernet Switch Module The following example configures the maximum aging time for VLAN 200 to ... root has priority 32768, address 0010.0d40.34c7 Designated bridge has priority 32768, address 0010.0d40.34c7 Designated port id is 128.1, designated path cost 0 Timers: message age 2, forward delay 0, hold 0 Number of transitions to forwarding state: 1 BPDU: sent 0, received 13513 Router# The following example...
User Guide
Page 155
...Parameters Examples The following examples show how to configure fallback bridging on an Interface Example, page 156 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ 155 16- and 36-Port Ethernet Switch Module Fallback Bridging Example This section describes how to adjust spanning-... page 156 • Assigning a Path Cost Example, page 156 • Adjusting BPDU Intervals Example, page 156 • Disabling the Spanning Tree on your switch. and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration Examples for bridge group ...
...Parameters Examples The following examples show how to configure fallback bridging on an Interface Example, page 156 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ 155 16- and 36-Port Ethernet Switch Module Fallback Bridging Example This section describes how to adjust spanning-... page 156 • Assigning a Path Cost Example, page 156 • Adjusting BPDU Intervals Example, page 156 • Disabling the Spanning Tree on your switch. and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration Examples for bridge group ...
User Guide
Page 156
...Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration ...-if)# bridge-group 10 priority 20 Assigning a Path Cost Example The following example shows how to change the path cost on an interface to 10 in bridge group 10: ...(config)# interface gigabitethernet0/1 Switch(config-if)# bridge-group 10 path-cost 20 Adjusting BPDU Intervals Example You can adjust BPDU intervals as described...(config)# interface gigabitethernet0/1 Switch(config-if)# bridge group 10 spanning-disabled 156 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ and 36-Port Ethernet...
...Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Configuration ...-if)# bridge-group 10 priority 20 Assigning a Path Cost Example The following example shows how to change the path cost on an interface to 10 in bridge group 10: ...(config)# interface gigabitethernet0/1 Switch(config-if)# bridge-group 10 path-cost 20 Adjusting BPDU Intervals Example You can adjust BPDU intervals as described...(config)# interface gigabitethernet0/1 Switch(config-if)# bridge group 10 spanning-disabled 156 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ and 36-Port Ethernet...
User Guide
Page 232
...and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series show spanning-tree command in privileged EXEC mode. show spanning-tree 16- Ranges are not supported. The bridge...-group argument and the active, backbonefast, blockedports, bridge, inconsistentports, pathcost method, root, total, and uplinkfast keywords were added. Valid interfaces include physical ports and VLANs. (Optional) Displays the default path cost...
...and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series show spanning-tree command in privileged EXEC mode. show spanning-tree 16- Ranges are not supported. The bridge...-group argument and the active, backbonefast, blockedports, bridge, inconsistentports, pathcost method, root, total, and uplinkfast keywords were added. Valid interfaces include physical ports and VLANs. (Optional) Displays the default path cost...
User Guide
Page 233
... 128.20 128 100 BLK 38 0404.0400.0001 128.20 Fa0/15 128.21 128 100 BLK 38 0404.0400.0001 128.21 Fa0/16 128.22 128 100 BLK 38 0404.0400.0001 128.22 Fa0/17 128.23 128 100 BLK 38 0404.0400.0001 128.23 Fa0... 1, topology change 35, notification 2 hello 2, max age 20, forward delay 15 Timers: hello 0, topology change 0, notification 0 Interface Fa0/1 in Spanning tree 1 is down Port path cost 100, Port priority 128 Designated root has priority 32768, address 0010.0b3f.ac80 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ 233
... 128.20 128 100 BLK 38 0404.0400.0001 128.20 Fa0/15 128.21 128 100 BLK 38 0404.0400.0001 128.21 Fa0/16 128.22 128 100 BLK 38 0404.0400.0001 128.22 Fa0/17 128.23 128 100 BLK 38 0404.0400.0001 128.23 Fa0... 1, topology change 35, notification 2 hello 2, max age 20, forward delay 15 Timers: hello 0, topology change 0, notification 0 Interface Fa0/1 in Spanning tree 1 is down Port path cost 100, Port priority 128 Designated root has priority 32768, address 0010.0b3f.ac80 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ 233
User Guide
Page 234
...spanning-tree interface fastethernet0/3 command: Switch# show spanning-tree 16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Designated bridge has priority 32768, address 00e0.1eb2.ddc0 Designated port is 3, path cost 410 Timers: message age 0, forward delay 0, hold 0 ... address 00e0.1e9f.4abf Designated port is 1, path cost 10 Timers: message age 0, forward delay 0, hold 0 BPDU: sent 0, received 0 Related Commands Command spanning-tree vlan Description Enables STP on a VLAN. 234 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)...
...spanning-tree interface fastethernet0/3 command: Switch# show spanning-tree 16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Designated bridge has priority 32768, address 00e0.1eb2.ddc0 Designated port is 3, path cost 410 Timers: message age 0, forward delay 0, hold 0 ... address 00e0.1e9f.4abf Designated port is 1, path cost 10 Timers: message age 0, forward delay 0, hold 0 BPDU: sent 0, received 0 Related Commands Command spanning-tree vlan Description Enables STP on a VLAN. 234 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)...