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Chapter 3
VLANs
VLAN Type SAID MTU Parent RingNo BridgeNo Stp Trans1 Trans2
-------------------------------------------------------------------------
1 Ethernet 100001 1500 0 0 0 Unkn 1002 1003
2 Ethernet 100002 1500 0 1 1 Unkn 0 0
3 Ethernet 100003 1500 0 1 1 Unkn 0 0
4 Ethernet 100004 1500 0 1 1 Unkn 0 0
1002 FDDI 101002 1500 0 0 0 Unkn 1 1003
1003 Token-Ring 101003 1500 1005 1 0 Unkn 1 1002
1004 FDDI-Net 101004 1500 0 0 1 IEEE 0 0
1005 Token-Ring-Net 101005 1500 0 0 1 IEEE 0 0
-------------------------------------------------------------------------
You could also just type show vlan # to gather information about only
one VLAN at a time:
1900EN#sh vlan 2
VLAN Name Status Ports
-----------------------------------
2 sales Enabled 2
-----------------------------------
VLAN Type SAID MTU Parent RingNo BridgeNo Stp Trans1 Trans2
---------------------------------------------------------------------
2 Ethernet 100002 1500 0 1 1 Unkn 0 0
---------------------------------------------------------------------
1900EN#
Identifying VLANs
V
LANs can span multiple connected switches, which Cisco calls a
switch-fabric. Switches within the switch-fabric must keep track of frames as
they are received on the switch ports, and they must keep track of the
VLAN they belong to as the frames traverse the switch-fabric. Frame tag-
ging performs this function. Switches can then direct frames to the appro-
priate port.
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