Cisco WS-C2950SX-48-SI Configuration Manual page 245

Chapter 11 Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports
1/1
1/2
Port
--------
1/1
1/2
Port
--------
1/1
1/2
Port
--------
1/1
1/2Switch_1> (enable)
When the trunk links come up, VTP passes the VTP and VLAN configuration to Switch 2. Verify that
Step 6
Switch 2 has learned the VLAN configuration by entering the show vlan command on Switch 2:
Switch_2> (enable) show vlan
VLAN Name
---- -------------------------------- --------- ----------------------------
1
10
20
30
40
50
60
1002 fddi-default
1003 token-ring-default
1004 fddinet-default
1005 trnet-default
.
.
.
Switch_2> (enable)
Step 7 Spanning tree takes one to two minutes to converge. After the network stabilizes, check the spanning
tree state of each trunk port on Switch 1 by entering the show spantree command.
Trunk 1 is forwarding for all VLANs. Trunk 2 is blocking for all VLANs. On Switch 2, both trunks are
forwarding for all VLANs, but no traffic passes over Trunk 2 because port 1/2 on Switch 1 is blocking.
Switch_1> (enable) show spantree 1/1
Port
--------- ----
1/1
1/1
1/1
1/1
1/1
1/1
1/1
1/1
1/1
Switch_1> (enable) show spantree 1/2
Port
--------- ----
1/2
1/2
1/2
78-15486-01
desirable dot1q
desirable dot1q
Vlans allowed on trunk
---------------------------------------------------------------------
1-1005,1025-4094
1-1005,1025-4094
Vlans allowed and active in management domain
---------------------------------------------------------------------
1,10,20,30,40,50,60
1,10,20,30,40,50,60
Vlans in spanning tree forwarding state and not pruned
---------------------------------------------------------------------
1,10,20,30,40,50,60
default
VLAN0010
VLAN0020
VLAN0030
VLAN0040
VLAN0050
VLAN0060
Vlan Port-State
-------------
1 forwarding
10 forwarding
20 forwarding
30 forwarding
40 forwarding
50 forwarding
60 forwarding
1003 not-connected
1005 not-connected
Vlan Port-State
-------------
1 blocking
10 blocking
20 blocking
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide
trunking 1
trunking 1
Status Mod/Ports, Vlans
active
active
active
active
active
active
active
active
active
active
active
Cost Priority Fast-Start
----- -------- ----------
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 32 disabled
19 4 disabled
Cost Priority Fast-Start
----- -------- ----------
19 32 disabled
19 32 disabled
19 32 disabled
Example VLAN Trunk Configurations
Group-method
------------
Group-method
------------
—
Release 8.1
11-15