From: rwcolosky@chartermi.net
Date: Thu Jul 01 2004 - 13:32:58 GMT-3
Can someone please tell me how to use this IOS feature on the 3550 EMI....
switchport mode multi "optional parameters"
Configuring Multi-VLAN Port on Catalyst 2900 XL/3500 XL
The multi-VLAN port feature on the Catalyst 2900 XL/3500 XL switches allows
for configuring a single port in two or more VLANs. This feature allows users
from different VLANs to access a server or router without implementing
InterVLAN routing capability. A multi-VLAN port performs normal switching
functions in all its assigned VLANs. VLAN traffic on the multi-VLAN port is
not encapsulated as it is in trunking.
Note: The limitations of implementing multi-VLAN port features are listed
below.
a.. You cannot configure a multi-VLAN port when a trunk is configured on the
switch. You must connect the multi-VLAN port only to a router or server. The
switch automatically transitions to VTP transparent mode when the multi-VLAN
port feature is enabled, making the VTP disabled. No VTP configuration is
required.
b.. The multi-VLAN port feature is supported only on the Catalyst 2900
XL/3500 XL series switches. This feature is not supported on the Catalyst
4000/5000/6000 series or any other Cisco Catalyst switches.
1.. In the lab, to show how the multi-VLAN port is configured, we have
created three VLANs on a Catalyst 3512 XL switch, and one port of the switch
is connected to an external router. The port connected to the router will be
configured as a multi-VLAN port.
6-3512xl#show vlan
VLAN Name Status Ports
---- -------------------------------- ---------
-------------------------------
1 default active Fa0/1, Fa0/3, Fa0/6, Fa0/7,
Fa0/8, Fa0/9, Fa0/10,
Fa0/11,
Fa0/12, Gi0/1, Gi0/2
2 VLAN0002 active Fa0/2, Fa0/4
3 VLAN0003 active Fa0/5
4 VLAN0004 active
5 VLAN0005 active
6 VLAN0006 activeHere, port Fa0/1 is connected to
external router. For more information on learning how to create VLANs and
assigning ports to VLANs, refer to the Configuring the VLAN on Catalyst
2900/3500 XL, 2950, and 3550 Series Switches section of this document.
2.. Configure the Fa0/1 port in multi-VLAN mode, and add assigned VLANs to
the multi-VLAN port.
6-3512xl#configure t
Enter configuration commands, one per line. End with CNTL/Z.
6-3512xl(config)#int fa0/1
6-3512xl(config-if)#switchport mode multi
!--- The port Fa0/1 mode is changed to multi.
6-3512xl(config-if)#switchport multi vlan ?
LINE VLAN IDs of VLANs to be used in multi-VLAN mode
add add VLANs to the current list
remove remove VLANs from the current list
6-3512xl(config-if)#switchport multi vlan 1,2,3
!--- VLANs 1, 2, and 3 are assigned to multi-VLAN port Fa0/1.
6-3512xl(config-if)#^Z
6-3512xl#3.. Verify the configuration by issuing the show vlan and show
interface interface-id switchport commands.
6-3512xl#show interface fa0/1 switchport
Name: Fa0/1
Operational Mode: multi
!--- The port is in multi-VLAN mode.
Administrative Trunking Encapsulation: isl
Operational Trunking Encapsulation: isl
Negotiation of Trunking: Disabled
Access Mode VLAN: 0 ((Inactive))
Trunking Native Mode VLAN: 1 (default)
Trunking VLANs Enabled: NONE
Pruning VLANs Enabled: NONE
Priority for untagged frames: 0
Override vlan tag priority: FALSE
Voice VLAN: none
Appliance trust: none
6-3512xl#
6-3512xl#show vlan brief
VLAN Name Status Ports
---- -------------------------------- ---------
-------------------------------
1 default active Fa0/1, Fa0/3, Fa0/6,
Fa0/7,
Fa0/8, Fa0/9, Fa0/10,
Fa0/1
Fa0/12, Gi0/1, Gi0/2
2 VLAN0002 active Fa0/1, Fa0/2, Fa0/4
!--- Note that previously, port Fa0/1 was only in VLAN 1, now it's assigned to
multiple VLANs,
!--- 1, 2, and 3.
3 VLAN0003 active Fa0/1, Fa0/5
4 VLAN0004 active
5 VLAN0005 active
4.. You can verify the multi-VLAN operation by issuing the ping command from
switch to router. The ping command should get a reply from the router every
time the management IP address is assigned to any of the VLANs 1, 2, or 3.
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