10-11
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
Chapter 10 Configuring VLANs
Configuring VLANs on the Switch
Console> (enable) show port 2/4
Port Name Status Vlan Level Duplex Speed Type
----- ------------------ ---------- ---------- ------ ------ ----- ------------
2/4 notconnect 500 normal auto auto 10/100BaseTX
Port Security Secure-Src-Addr Last-Src-Addr Shutdown Trap IfIndex
----- -------- ----------------- ----------------- -------- -------- -------
2/4 disabled No disabled 12
Port Status Channel Channel Neighbor Neighbor
mode status device port
----- ---------- --------- ----------- ------------------------- ----------
2/4 notconnect auto not channel
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize
----- ---------- ---------- ---------- ---------- ---------
2/4 - 0 0 0 0
Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants
----- ---------- ---------- ---------- ---------- --------- --------- ---------
2/4 0 0 0 0 0 0 0
Last-Time-Cleared
--------------------------
Wed Jul 26 2000, 19:44:05
Console> (enable)
Mapping 802.1Q VLANs to ISL VLANs
Your network might have non-Cisco devices that are connected to the Catalyst 6500 series switches
through 802.1Q trunks or traffic from a non-Cisco switch that has VLANs in the Catalyst 6500 series
reserved range, 1002–1024.
The valid range of user-configured Inter-Switch Link (ISL) VLANs is 1–1000 (and 1002–1005; see
Table 10-1) and 1025–4094. The valid range of VLANs that are specified in 802.1Q is 0–4095. In a
network with non-Cisco devices that are connected to Cisco switches through 802.1Q trunks, you can
map 802.1Q VLAN numbers that are greater than 1000 to ISL VLAN numbers. If you use any VLANs
in the extended range (1025–4094) for dot1q mappings, you cannot use any of the extended-range
VLANs for any other purpose.
802.1Q VLANs in the range 1–1000 are automatically mapped to the corresponding ISL VLAN. 802.1Q
VLAN numbers that are greater than 1000 must be mapped to an ISL VLAN in order to be recognized
and forwarded by Cisco switches.
Note these restrictions when mapping 802.1Q VLANs to ISL VLANs:
• You can configure up to seven 802.1Q-to-ISL VLAN mappings on the switch.
• You must map 802.1Q VLANs to Ethernet-type ISL VLANs.
• Do not enter the native VLAN of any 802.1Q trunk in the mapping table.
• When you map an 802.1Q VLAN to an ISL VLAN, traffic on the 802.1Q VLAN corresponding to
the mapped ISL VLAN is blocked. For example, if you map 802.1Q VLAN 2000 to ISL VLAN 200,
traffic on 802.1Q VLAN 200 is blocked.
• VLAN mappings are local to each switch. Make sure that you configure the same VLAN mappings
on all appropriate switches in the network.
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