Layer 2 Switching Configuration Examples

This chapter provides examples for configuring Layer 2 switching.

Configuration Example for Layer 2 Switching

The following example shows how to add a static MAC address and how to modify the default global aging time for MAC addresses: 

switch# configure terminal
switch(config)# mac address-table static 0000.0000.1234 vlan 10 interface ethernet 2/15
switch(config)# mac address-table aging-time 120

Configuration Example for VLANs

The following example shows how to create and name a VLAN as well as how to make the state active and administratively up:

switch# configure terminal
switch(config)# vlan 10
switch(config-vlan)# name test
switch(config-vlan)# state active
switch(config-vlan)# no shutdown
switch(config-vlan)# exit
switch(config)#

Configuration Examples for Private VLANs

The following example shows how to create the three types of private VLANs, how to associate the secondary VLANs to the primary VLAN, how to create a private VLAN host and promiscuous port and assign them to the correct VLAN, and how to create a VLAN interface, or SVI, to allow the primary VLAN to communicate with the rest of the network:

switch# configure terminal
switch(config)# vlan 2
switch(config-vlan)# private-vlan primary
switch(config-vlan)# exit
switch(config)# vlan 3
switch(config-vlan)# private-vlan community
switch(config-vlan)# exit
switch(config)# vlan 4
switch(config-vlan)# private-vlan isolated
switch(config-vlan)# exit

switch(config)# vlan 2
switch(config-vlan)# private-vlan association 3,4
switch(config-vlan)# exit

switch(config)# interface ethernet 1/11
switch(config-if)# switchport
switch(config-if)# switchport mode private-vlan host
switch(config-if)# exit
switch(config)# interface ethernet 1/12
switch(config-if)# switchport
switch(config-if)# switchport mode private-vlan promiscuous
switch(config-if)# exit

switch(config)# interface ethernet 1/11
switch(config-if)# switchport private-vlan host-association 2 3
switch(config-if)# exit
switch(config)# interface ethernet 1/12
switch(config-if)# switchport private-vlan mapping 2 3,4
switch(config-if)# exit

switch(config)# interface vlan 2
switch(config-vlan)# private-vlan mapping 3,4
switch(config-vlan)# exit
switch(config)#

MST Example Configuration

The following example shows how to configure MST:

switch# configure terminal
switch(config)# spanning-tree mode mst
switch(config)# spanning-tree port type edge bpduguard default
switch(config)# spanning-tree port type edge bpdufilter default
switch(config)# spanning-tree port type network default
switch(config)# spanning-tree mst 0-64 priority 24576
switch(config)# spanning-tree mst configuration
switch(config-mst)# name cisco_region_1
switch(config-mst)# revision 2
switch(config-mst)# instance 1 vlan 1-21
switch(config-mst)# instance 2 vlan 22-42
switch(config-mst)# instance 3 vlan 43-63
switch(config-mst)# instance 4 vlan 64-84
switch(config-mst)# instance 5 vlan 85-105
switch(config-mst)# instance 6 vlan 106-126
switch(config-mst)# instance 6 vlan 106-126
switch(config-mst)# instance 7 vlan 127-147
switch(config-mst)# instance 8 vlan 148-168
switch(config-mst)# instance 9 vlan 169-189
switch(config-mst)# instance 10 vlan 190-210
switch(config-mst)# instance 11 vlan 211-231
switch(config-mst)# instance 12 vlan 232-252
switch(config-mst)# instance 13 vlan 253-273
switch(config-mst)# instance 14 vlan 274-294
switch(config-mst)# instance 15 vlan 295-315
switch(config-mst)# instance 16 vlan 316-336
switch(config-mst)# instance 17 vlan 337-357
switch(config-mst)# instance 18 vlan 358-378
switch(config-mst)# instance 19 vlan 379-399
switch(config-mst)# instance 20 vlan 400-420
switch(config-mst)# instance 21 vlan 421-441
switch(config-mst)# instance 22 vlan 442-462
switch(config-mst)# instance 23 vlan 463-483
switch(config-mst)# instance 24 vlan 484-504
switch(config-mst)# instance 25 vlan 505-525
switch(config-mst)# instance 26 vlan 526-546
switch(config-mst)# instance 27 vlan 547-567
switch(config-mst)# instance 28 vlan 568-588
switch(config-mst)# instance 29 vlan 589-609
switch(config-mst)# instance 30 vlan 610-630
switch(config-mst)# instance 31 vlan 631-651
switch(config-mst)# instance 32 vlan 652-672
switch(config-mst)# instance 33 vlan 673-693
switch(config-mst)# instance 34 vlan 694-714
switch(config-mst)# instance 35 vlan 715-735
switch(config-mst)# instance 36 vlan 736-756
switch(config-mst)# instance 37 vlan 757-777
switch(config-mst)# instance 38 vlan 778-798
switch(config-mst)# instance 39 vlan 799-819
switch(config-mst)# instance 40 vlan 820-840
switch(config-mst)# instance 41 vlan 841-861
switch(config-mst)# instance 42 vlan 862-882
switch(config-mst)# instance 43 vlan 883-903
switch(config-mst)# instance 44 vlan 904-924
switch(config-mst)# instance 45 vlan 925-945
switch(config-mst)# instance 46 vlan 946-966
switch(config-mst)# instance 47 vlan 967-987
switch(config-mst)# instance 48 vlan 988-1008
switch(config-mst)# instance 49 vlan 1009-1029
switch(config-mst)# instance 50 vlan 1030-1050
switch(config-mst)# instance 51 vlan 1051-1071
switch(config-mst)# instance 52 vlan 1072-1092
switch(config-mst)# instance 53 vlan 1093-1113
switch(config-mst)# instance 54 vlan 1114-1134
switch(config-mst)# instance 55 vlan 1135-1155
switch(config-mst)# instance 56 vlan 1156-1176
switch(config-mst)# instance 57 vlan 1177-1197
switch(config-mst)# instance 58 vlan 1198-1218
switch(config-mst)# instance 59 vlan 1219-1239
switch(config-mst)# instance 60 vlan 1240-1260
switch(config-mst)# instance 61 vlan 1261-1281
switch(config-mst)# instance 62 vlan 1282-1302
switch(config-mst)# instance 63 vlan 1303-1323
switch(config-mst)# instance 64 vlan 1324-1344
switch(config-mst)# exit

switch(config)# interface ethernet 3/1
switch(config-if)# switchport
switch(config-if)# no shutdown
switch(config-if)# spanning-tree port type edge
switch(congig-if)# exit

switch(config)# interface ethernet 3/2
switch(config-if)# switchport
switch(config-if)# switchport mode trunk
switch(config-if)# no shutdown
switch(config-if)# spanning-tree guard root
switch(config-if)# exit
switch(config)#

Configuration Examples for STP Extension

The following example shows how to configure the STP extensions:

switch# configure terminal
switch(config)# spanning-tree port type network default
switch(config)# spanning-tree port type edge bpduguard default
switch(config)# spanning-tree port type edge bpdufilter default

switch(config)# interface ethernet 1/1
switch(config-if)# spanning-tree port type edge
switch(config-if)# exit

switch(config)# interface ethernet 1/2
switch(config-if)# spanning-tree port type edge
switch(config-if)# exit
switch(config)#