Cisco WS-C2980G-A Software Guide - Page 217
Mapping 802.1Q VLANs to ISL VLANs
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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 the IEEE 802.1Q standard is 0-4095. In a network environment 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. These restrictions apply 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. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 10-11
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