Enable IPv6 Support and Assign IPv6 Addresses

Before you execute the following instructions, ensure that all of the switches are in their default configuration. Also, disable GVRP, and start and enable PVRST+ on all switches. In the default configuration, vlan 1 is the default VLAN. If you plan to use another VLAN ID as the default VLAN, you must configure and enable the VLAN ID.

In the following examples, ports are configured as trunk, and vlan 10 is enabled on all three switches. vlan 10 is also used to show spanning tree status on switch C. See VLAN Module for information about configuring the VLAN module.

After the topology stabilizes, switch A is elected as the root because it has the lowest MAC address. All ports on all switches, except port 57 on switch C, should be in forwarding state. Port 57 on switch C should be detected as an alternate port in the discarding state.

Complete the following task on all three switches before setting the priority on switch C for the STP. Note that the following examples are run on switch C and similar commands must be run on switches A and B as well.

Enter the configuration mode.

TOR-2 SEFOS# configure terminal
TOR-2 SEFOS(config)#

Disable the GVRP module.

TOR-2 SEFOS(config)# set gvrp disable
TOR-2 SEFOS(config)#

Enable VLAN 10.

TOR-2 SEFOS(config)# vlan 10
TOR-2 SEFOS(config-vlan)# vlan active
TOR-2 SEFOS(config-vlan)# exit
TOR-2 SEFOS(config)#

Configure and bring up port 1 and port 57 as trunk.

TOR-2 SEFOS(config)# interface extreme-ethernet 0/1
TOR-2 SEFOS(config-if)# switchport mode trunk
TOR-2 SEFOS(config-if)# no shutdown
TOR-2 SEFOS(config-if)# exit
TOR-2 SEFOS(config)#
TOR-2 SEFOS(config)# interface extreme-ethernet 0/57
TOR-2 SEFOS(config-if)# switchport mode trunk
TOR-2 SEFOS(config-if)# no shutdown
TOR-2 SEFOS(config-if)# exit
TOR-2 SEFOS(config)#

Configure IP address and mask for VLAN 10.

TOR-2 SEFOS(config)# interface vlan 10
TOR-2 SEFOS(config-if)# shutdown
TOR-2 SEFOS(config-if)# ip address 192.168.10.149 255.255.255.0
TOR-2 SEFOS(config-if)# no shutdown
TOR-2 SEFOS(config-if)# end
TOR-2 SEFOS#

Repeat Steps 1 - 5 on switches A and B with their own port numbers, IP addresses, and masks.

After all three switches are properly configured and the spanning tree topology is stabilized, display the spanning tree information for VLAN 10 on switch C.

Port 57 should be in discarding state.

TOR-2 SEFOS# show spanning-tree vlan 10
 
-----------------------------------------------------------------
 
Spanning-tree for VLAN 10
Root Id         Priority   32778
                Address    00:14:4f:6c:56:6f
                Cost       2000
                Port       Ex0/1
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 32778
                Address 00:14:4f:6c:6e:0d
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/1    Root         Forwarding   2000     128    P2P
Ex0/57   Alternate    Discarding   2000     128    P2P
 
TOR-2 SEFOS#

Ping the VLAN 10 IP address of switch A or B from C.

TOR-2 SEFOS# ping 192.168.10.199
Reply Received From :192.168.10.199, TimeTaken : 160 msecs
Reply Received From :192.168.10.199, TimeTaken : 110 msecs
Reply Received From :192.168.10.199, TimeTaken : 90 msecs
 
--- 192.168.10.199 Ping Statistics ---
3 Packets Transmitted, 3 Packets Received, 0% Packets Loss
TOR-2 SEFOS#
 
TOR-2 SEFOS# ping 192.168.10.144
Reply Received From :192.168.10.144, TimeTaken : 100 msecs
Reply Received From :192.168.10.144, TimeTaken : 100 msecs
Reply Received From :192.168.10.144, TimeTaken : 110 msecs
 
--- 192.168.10.144 Ping Statistics ---
3 Packets Transmitted, 3 Packets Received, 0% Packets Loss
TOR-2 SEFOS#

To display the effect of the bridge priority on the port spanning tree state, in switch C, set the priority for the STP.
```
TOR-2 SEFOS# configure terminal
TOR-2 SEFOS(config)# spanning-tree vlan 10 brg-priority 4096
TOR-2 SEFOS(config)# end
TOR-2 SEFOS#
```
In the PVRST+ software, the spanning-tree parameters apply only to the specified VLAN.
For brg-priority, you can provide a value from 0 to 61440 in increments of 4096. The priority you provide is combined with the VLAN ID to obtain the actual priority for the instance created for the VLAN. If you do not specify a value, the VLAN ID is combined with a default value of 32768. If the combined number is lower than the other switches, the more likely it is that the switch will be chosen as the root switch.
Valid priority values are: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, and 61440.

Note - After you configure the bridge priority, you should confirm that switch C has been detected as the root and that port 1 of switch B is the alternate port.

In switch A, review the spanning-tree information.

NEM-1 SEFOS# show spanning-tree vlan 10
 
-------------------------------------------------------------------
Spanning-tree for VLAN 10
Root Id         Priority   4106
                Address    00:14:4f:6c:6e:0d
                Cost       2000
                Port       Ex0/7
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 32778
                Address 00:14:4f:6c:56:6f
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/3    Designated   Forwarding   2000     128    P2P
Ex0/7    Root         Forwarding   2000     128    P2P
Ex0/20   Designated   Forwarding   2000     128    P2P
NEM-1 SEFOS#

In switch B, review the spanning-tree information.

TOR-1 SEFOS# show spanning-tree vlan 10
 
-------------------------------------------------------------------
Spanning-tree for VLAN 10
Root Id         Priority   4106
                Address    00:14:4f:6c:6e:0d
                Cost       2000
                Port       Ex0/57
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 32778
                Address 00:14:4f:6c:69:ed
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/1    Alternate    Discarding   2000     128    P2P
Ex0/57   Root         Forwarding   2000     128    P2P
 
TOR-1 SEFOS#

In switch C, review the spanning-tree information.

TOR-2 SEFOS# show spanning-tree vlan 10
 
-------------------------------------------------------------------
Spanning-tree for VLAN 10
 
We are the root of the Spanning Tree
Root Id         Priority   4106
                Address    00:14:4f:6c:6e:0d
                Cost       0
                Port       0
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 4106
                Address 00:14:4f:6c:6e:0d
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/1    Designated   Forwarding   2000     128    P2P
Ex0/57   Designated   Forwarding   2000     128    P2P
 
TOR-2 SEFOS#

In switch C, reset the priority to the default value. Switch A should be reelected as root again.

TOR-2 SEFOS# configure terminal
TOR-2 SEFOS(config)# no spanning-tree vlan 10 brg-priority
TOR-2 SEFOS(config)# end
TOR-2 SEFOS#

In switch A, review the spanning-tree information (it shows switch A is a root again).

NEM-1 SEFOS# show spanning-tree vlan 10
 
-------------------------------------------------------------------
Spanning-tree for VLAN 10
We are the root of the Spanning Tree
 
Root Id         Priority   32778
                Address    00:14:4f:6c:56:6f
                Cost       0
                Port       0
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 32778
                Address 00:14:4f:6c:56:6f
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/3    Designated   Forwarding   2000     128    P2P
Ex0/7    Designated   Forwarding   2000     128    P2P
Ex0/20   Designated   Forwarding   2000     128    P2P
 
NEM-1 SEFOS#

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Enable IPv6 Support and Assign IPv6 Addresses