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Setting up a trunk between VLANs. VLAN
Trunking Protocol (VTP) allows two VLANs to be interconnected
using ports on the switch. This can be useful in
a large network, where many VLANs on differing switches
can be grouped together into a single VLAN. This
makes the complete network easier to administer,
as users can be assigned to a given VLAN. To implement
trunking, a cross connect cable is required between
the two switches in the trunking ports.
For example to setup a VLAN 2 on E0/1 to E0/3 and
VLAN 3 on E0/4 to E0/6. We can then set-up E0/10
and E0/11 to act as a trunk between the two VLANs.
This can be achieved with:
1 |
# vlan database |
2 |
# (vlan) vlan 2 name fred |
3 |
# (vlan) vlan 3 name bert |
4 |
# exit |
5 |
# config t |
6 |
# (config) int e0/1 |
7 |
# (config-if) switchport access vlan 2 |
8 |
# (config-if) exit |
9 |
# (config) int e0/2 |
10 |
# (config-if) switchport access vlan 2 |
11 |
# (config-if) exit |
12 |
# (config) int e0/3 |
13 |
# (config-if) switchport access vlan 2 |
14 |
# (config-if) exit |
15 |
# (config) int e0/4 |
16 |
# (config-if) switchport access vlan 3 |
17 |
# (config-if) exit |
18 |
# (config) int e0/5 |
19 |
# (config-if) switchport access vlan 3 |
20 |
# (config-if) exit |
21 |
# (config) int e0/6 |
22 |
# (config-if) switchport access vlan 3 |
23 |
# (config-if) exit |
24 |
# (config) int e0/10 |
25 |
# (config-if) switchport trunk allowed
vlan 2-3 |
26 |
# (config-if) switchport mode trunk |
27 |
# (config-if) exit |
28 |
# (config) int e0/11 |
29 |
# (config-if) switchport trunk allowed
vlan 2-3 |
30 |
# (config-if) switchport mode trunk |
31 |
# (config-if) exit |
32 |
# (config) exit |
33 |
# show vlan |
34 |
# show running-config |
VTP pruning
VTP pruning allows trunk connections to dynamically
remove VLANs which are not active between two switches.
It is setup in vlan database:
1 |
# vlan database |
2 |
# (vlan) vtp ? |
3 |
# (vlan) vtp domain my_vtp_domain_name |
4 |
# (vlan) vtp client |
5 |
# (vlan) vtp password my_vtp_password |
6 |
# (vlan) vtp pruning |
7 |
# (vlan) exit |
8 |
# show vtp status |
it is also possible to use the vtp server, vtp
client or vtp transparent.
If you would like to register the switch emulator,
or obtain the full version, please complete the
following:
 Purchase emulator
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